Broad Bean (Fava Bean, Faba Bean, Field Bean, Horse Bean, Broad Beans)
Vicia faba

Abelia
Abelia

Abutilon (Flowering Maple, Chinese Lantern)
Abutilon spp.

Acca (Pineapple Guava, Feijoa)
Acca sellowiana; syn. Orthostemon sellowianus

Acer (Maple, Japanese Maple)
Acer spp.

Aconite (Monkshood, Wolfsbane)
Aconitum spp.

Aeonium
Aeonium spp.

African Violet
Saintpaulia

Agapanthus (African Blue Lily)
Agapanthus spp.

Agave (Century Plant)
Agave spp.

Ageratum (Floss Flower)
Ageratum houstonianum

Air Plant (Tillandsia)
Tillandsia

Alexanders (Horse Parsley, Smyrnium)
Smyrnium olusatrum, S. perfoliatum

Alfalfa (Lucerne)
Medicago sativa

Allium
Allium spp.

Aloe (Aloe Vera)
Aloe spp; esp. Aloe vera, syn. Aloe vulgaris/Aloe barbadensis

Alstroemeria (Peruvian Lily, Parrot Lily)
Alstroemeria spp.

Aluminium Plant (Pilea, Silver Tree, Friendship Plant)
Pilea cadierei; Pilea spruceana

Alyssum (Sweet Alyssum)
Alyssum maritimum; Lobularia maritima

Amaryllis (Hippeastrum)
Hippeastrum spp.

Anemone
Anemone spp.

Angel's Fishing Rod (Angels Fishing Rod, Dierama, Fairy's Fishing Rods, Fairy's Wand)
Dierama spp.

Angel's Trumpet (Angels Trumpet) - Brugmansia
Brugmansia spp.

Angelica (Garden/Herb/Wild Angelica, Holy Ghost, Wild Celery)
Angelica archangelica; Angelica sylvestris

Annual Wall Rocket (Wall Rocket, Stink Weed)
Diplotaxis muralis, syn. Sisymbrium murale

Antirrhinum (Snapdragon, Snap Dragon)
Antirrhinum spp. esp. Antirrhinum majus & antirrhinum siculum

Apple (Fruit)
Malus domestica

Apple (Tree)
Malus domestica

Apricot (Fruit)
Prunus armeniaca

Apricot (Tree) (Flowering Apricot, Japanese Flowering Apricot)
Prunus armeniaca; Prunus armeniaca mume

Aquilegia (Columbine, Granny's Bonnet, Grannys Bonnet)
Aquilegia spp.

Arisaema (Jack in the Pulpit, Jack-in-the-Pulpit, Cobra Lily)
Arisaema spp.

Arnica (European Arnica, Mountain Arnica, Common Arnica, Leopard's Bane
Arnica montana

Artillery Plant (Pilea, Gunpowder Plant)
Pilea microphylla

Arum Lily (Calla Lily)
Zantedeschia aethiopica

Ash (Common Ash, European Ash, Narrow-leafed Ash)
Fraxinus spp.

Asparagus
Asparagus officinalis

Aspidistra (Cast Iron Plant)
Aspidistra spp. (especially Aspidistra eliator)

Aster
Aster spp.

Astilbe (False Spiraea, False Goat's Beard, False Goats Beard)
Astilbe spp.

Astrantia (Masterwort, Hattie's Pincushion, Hatties Pincushion)
Astrantia spp.

Aubergine (Eggplant)
Solanum melongena

Aubretia (Aubrieta)
Aubrietia

Auricula
Primula Auricula

Autumn Crocus (Naked Ladies, Meadow Saffron)
Colchicum autumnale

Avocado Fruit (Alligator Pear, Avocado Pear)
Persea Americana, syn: Persea gratissima

Avocado Tree (Alligator Pear, Avocado Pear)
Persea Americana, syn: Persea gratissima

Azalea
Rhododendron spp.

Bachelors Buttons (Bachelor's Buttons, Mountain Cornflower, Perennial Cornflower)
Centaurea spp.; esp. Centaurea cyanus and Centaurea montana

Bacopa (Trailing Phlox)
Chaenostoma cordata, syn. Chaenostoma cordatum; formerly Sutera cordata, syn. Sutera diffusus

Bacopa (Water Hyssop, Waterhyssop)
Bacopa spp.

Balloon Flower (Chinese Bellflower)
Platycodon grandiflorus

Bamboo
Fargesia spp., Phyllostachys spp.

Banana (Plantain) (Fruit)
Musa acuminata; Musa balbisiana

Banana (Plantain) (Plant)
Musa acuminata; Musa balbisiana

Baneberry (Doll's Eye, Bugbane, Black Cohosh, Herb Christopher, Snakeroot, Brunette Bugbane, Purple Bugbane, Black Bugbane)
Actaea spp.

Barley Grass (Barley)
Hordeum spp.

Barrenwort (Barren Wort, Fairy Wings, Bishop's Hat, Bishops Hat, Horny Goat Weed, Epimedium)
Epimedium spp., esp. E.grandiflorum

Basil (Sweet Basil, Bush Basil)
Ocimum basilicum

Basket of Gold (Golden-tuft, Golden Alyssum, Gold-dust, Rock Madwort)
Aurinia saxatilis; syn. Alyssum saxatile

Bay Tree (Bay Leaf, Bay Leaves, Bay Laurel)
Laurus nobilis

Bean (Runner Bean, French Bean, Green Bean, String Bean)
Phaseolus coccineus; P. vulgaris

Bean Sprouts (Beansprouts, Bean Shoots, Beanshoots)
Vigna radiata; Glycine max

Bears Breeches (Bear's Breeches, Acanthus)
Acanthus spp.

Beauty Berry (Beautyberry, American Beautyberry, Purple Beautyberry)
Callicarpa spp., esp. C. americana; C. bodinieri

Beech (European Beech, Common Beech, Copper Beech, Purple Beech)
Fagus spp

Beetroot (Beet, Table Beet, Garden Beet, Red Beet, Golden Beet)
Beta vulgaris

Begonia (Begonia Rex, tubers/rhizomes)
Begonia x tuberhybrida, Begonia rex

Begonia (Wax Begonia)
Begonia semperflorens

Berberis (Barberry, Berberry)
Berberis spp.

Bergamot (Bee Balm, Oswego Tea, Scarlet Monarda)
Monarda spp.

Big Betony
Stachys macrantha, syn. Stachys grandiflora; Stachys spicata

Bilberry (Whortleberry, Huckleberry)
Vaccinium myrtillus

Bindweed (Field Bindweed)
Convolvulus arvensis.

Bindweed (Hedge Bindweed)
Calystegia sepium

Birch (Silver Birch, White Birch, Paper Birch, Yellow Birch)
Betula spp.

Bird of Paradise
Strelitzia

Bird's Foot Trefoil (Common Birds Foot Trefoil, Birdsfoot Trefoil, Hairy Bird's Foot Trefoil)
Lotus corniculatus, Lotus subbiflorus

Birthwort (Aristolochia, Pipevine, Dutchman's Pipe)
Aristolochia spp.

Bistort (Common Bistort, Alpine Bistort)
Persicaria bistorta syn. Polygonum bistorta; Persicaria vivipara

Bittercress
Cardamine spp.

Bittersweet
Solanum dulcamara

Black Currant (Blackcurrant)
Ribes nigrum

Black Horehound (Stinking Roger, Stinking Horehound)
Ballota nigra

Black Locust (False Acacia)
Robinia pseudoacacia

Black Medic (Black Medick)
Medicago lupulina

Black Mondo Grass (Ophiopogon, Snakes Beard, Lilyturf, Aztec Grass)
Ophiopogon spp.

Black Nightshade (Garden Nightshade)
Solanum nigrum L.

Black-eyed Susan (Black Eyed Susan, Brown Eyed Susan, Coneflower, Rudbeckia, Yellow Ox-eye Daisy)
Rudbeckia hirta; Rudbeckia fulgida

Black-eyed Susan (Black Eyed Susan, Thunbergia)
Thunbergia alata

Blackberry
Rubus spp., esp. Rubus fruticosus

Blackthorn (Sloe)
Prunus spinosa

Blanket Weed (String Algae, Mermaid Hair, Pond Scum)
Cladophora spp. Spirogyra spp., Mougeotia

Bleeding Heart (Dutchmans Breeches, Dutchman's Breeches)
Lamprocapnos spectabilis (formerly Dicentra spectabilis)

Blue Potato Bush (Paraguay Nightshade, Blue Lycianthes)
Lycianthes rantonnetii, syn. Solanum rantonnetii

Blue Sowthistle (Blue Sow Thistle, Common Blue Sowthistle, Alpine Blue-sow-thistle)
Cicerbita, esp. C. macrophylla, C. alpina, C. plumieri

Blue Star Creeper (Swamp Isotome, Matted Pratia)
Pratia pedunculata; syn. Isotoma fluviatilis, Lobelia fluviatilis, Laurentia fluviatilis

Blue-eyed Grass (Blue Eye Grass, Blue Eyed Grass, American Blue-eyed Grass)
Sisyrinchium angustifolium, Sisyrinchium montanum

Bluebell (English Bluebell, Spanish Bluebell)
Hyacinthoides non-scripta/Hyacinthoides hispanica

Blueberry
Vaccinium cyanococcus

Borage (Star Flower)
Borago officinalis

Boston Fern (Sword Fern, Fishbone Fern, Ladder Fern)
Nephrolepsis exaltata

Boston Ivy
Parthenocissus tricuspidata

Bottlebrush
Callistemon spp.

Bougainvillea
Bougainvillea spp.

Box
Buxus sempervirens

Bracken
Pteridium aquilinum

Bramble
Rubus spp., esp. Rubus fruticosus

Bristly Oxtongue (Bristly Ox-tongue, Bristly Ox Tongue)
Picris echioides; Helminthotheca echioides; Helmintia echioides

Broadleaf Filaree
Erodium botrys

Broadleaf Stonecrop (Sedum Spathulifolium)
Sedum spathulifolium

Broccoli (Calabrese, Sprouting Broccoli)
Brassica oleracea (Italica Group)

Bromeliad
Bromelioideae (subfamily containing 32 genera)

Broom (Common Broom, Spanish Broom, Scotch Broom, English Broom, French Broom)
Cytisus; Genista, Chamaecytisus; Spartium

Brunnera (Siberian Bugloss, False Forget-me-not)
Brunnera spp.

Brussels Sprouts (Brussel Sprouts)
Brassica oleraceae (Gemmifera Group)

Bryony (White Bryony, Red Bryony)
Bryonia spp.

Buddleia (Butterfly Bush, Buddleja)
Buddleia spp.

Bugle (Ajuga, Bugleweed)
Ajuga reptans; Ajuga Pyramidalis

Bulrush (Bullrush, Cattail, Reed Mace)
Typha spp.

Burclover (Spotted Medic, Spotted Burclover)
Medicago arabica; M. maculata

Burdock
Arctium spp.

Burnet (Greater Burnet, Common Burnet, Sanguisorba)
Sanguisorba officinalis, S. canadensis

Burning Bush (Burningbush, Kochia, Fireweed, Firebush, Mexican Fireweed, Summer Cypress, Belvedere)
Bassia scoparia; syn. Kochia scoparia

Burr Marigold (Three-lobe Beggarticks, Water Agrimony)
Bidens tripartita

Busy Lizzie (Touch-me-not)
Impatiens spp.

Butterbur (Common Butterbur, Bog Rhubarb)
Petasites hybridus, syn. P. vulgaris, P. officinalis, P. ovatus

Buttercup
Ranunculus repens

Cabbage (Red Cabbage, Savoy Cabbage, White Cabbage, Sweetheart Cabbage)
Brassica oleracea (Capitata Group); Brassica oleracea var. sabauda; Brassica oleracea, var. capitata f. rubra.

Cabomba (Fanwort)
Cabomba caroliniana

California Poppy (Californian Poppy)
Eschscholzia californica

Callisia (Creeping Inch Plant, Inch Plant, Chain Plant, Turtle Vine)
Callisia spp. esp. Callisia repens, syn. Tradescantia minima; Callisia fragrans

Camassia
Camassia spp.

Camellia
Camellia japonica

Campanula (Trailing or Low Growing: Bell Flower, Bellflower)
Campanula carpatica, Campanula poertenschlagiana, Campanula poscharskyana, Campanula garganica, Campanula cochlearifolia, Campanula rotundifloria, Campanula alpina

Campanula (Upright: Bell Flower, Bellflower, Canterbury Bells)
Campanula persicifolia, Campanula medium, Campanula lactiflora, Campanula glomerata, Campanulalatifolia, Campanula punctata, Campanula takesimana

Campion
Silene spp.

Candytuft (Wild Candytuft, Candy Tuft)
Iberis, esp Iberis amara

Canna Lily (Canna, Indian Shot)
Canna

Cape Fuchsia (Cape Figwort)
Phygelius capensis

Cape Honeysuckle
Tecoma capensis

Cape Pondweed (Cape Pond Weed, Water Hawthorn, Waterblommetjies)
Aponogeton distachyos, syn. Aponogeton distachyum

Carex (Sedge)
Carex spp.

Carrot
Daucus carota sativus

Caryopteris (Blue Mist, Blue Mist Spirea)
Caryopteris

Castor Oil Plant
Ricinus communis

Cat Grass (Oat Grass, Wheat Grass, Orchard Grass, Barley Grass, Rye Grass)
Avena sativa; Triticum spp.; Dactylis glomerata; Hordeum spp.; Lolium perenne

Cat's Ear (Cat's Ears, Cats Ears, Catsear)
Hypochaeris radicata

Catnip (Catmint)
Nepeta spp., especially N. cataria; N. faassenii

Cauliflower
Brassica oleracea (Botrytis Group)

Ceanothus (Blue Brush)
Ceanothus spp.

Cedar
Cedrus spp.

Celery
Apium graveolens

Celosia (Woolflower, Cockscomb, Cocks Comb)
Celosia spp.

Centaury (Centaurium, Seaside Centaury, Feverwort)
Centaurium spp.

Ceratostigma (Chinese Plumbago)
Ceratostigma spp.

Chameleon Plant
Houttuynia cordata

Chamomile (Mayweed, Scented Mayweed, German Chamomile)
Matricaria recutita, syn. Matricaria chamomilla

Chard (Swiss Chard)
Beta vulgaris

Charlock Mustard (Field Mustard, Wild Mustard, Charlock)
Sinapis arvensis

Chayote (Christophene, Christophine, Cho-Cho, Mirliton)
Sechium edule

Chenille Plant (Red-hot Cat's Tail)
Acalypha hispida; Acalypha chamaedrifolia

Cherry (Fruit)
Prunus spp.

Cherry (Tree)
Prunus spp.

Chia (Mexican Chia)
Salvia hispanica

Chickweed
Cerastium spp./Stellaria spp.

Chicory (Wild Chicory, Common Chicory)
Cichorium intybus

Chilean Potato Vine (Solanum Crispum, Chilean Nightshade)
Solanum Crispum

Chili Pepper (Chilli Pepper, Hot Pepper)
Capiscum spp.

China Doll (Serpent Tree, Emerald Tree, Asian Bell Tree, Baby Doll)
Radermarchera sinica

Chinese Cabbage (Pak Choy, Bok Choy, Bok Choi, Napa Cabbage)
Brassica rapa chinensis; Brassica rapa pekinensis

Chinese Forget-Me-Not (Chinese Forget Me Not, Chinese Hound's Tongue)
Cynoglossum amabile

Chinese Lantern (Ground Cherry, Groundcherry, Cape Gooseberry, Winter Cherry, Japanese Lantern, Physalis)
Physalis spp.

Chionodoxa (Glory-of-the-Snow)
Chionodoxa spp.

Chives
Allium schoenoprasum

Christmas Cactus
Schlumbergera bridgesii

Chrysanthemum
Chrysanthemum spp.

Cineraria (Pericallis, Florists Cineraria, Senetti)
Pericallis; esp. Pericallis x hybrida, Senecio cruentus, Pericallis cruenta, Senecio x hybrida

Cinquefoil (Common Tormentil, Barren Strawberry)
Potentilla

Cistus (Rock Rose, Rose of Sharon)
Cistus spp.

Citrus Fruits (Orange, Lemon, Lime, Grapefruit, Satsuma, Mandarin)
Citrus spp.

Citrus Tree (Orange, Lemon, Lime, Grapefruit, Satsuma, Mandarin)
Citrus spp.

Clarkia (Godetia)
Clarkia spp.

Clematis
Clematis

Clivia (Kaffir Lily, Bush Lily)
Clivia

Clover (Shamrock)
Trifolium spp.

Cogongrass (Blood Grass, Japanese Bloodgrass, Blady Grass, Cogon Grass, Alang Alang)
Imperata cylindrica

Coleus (Flame Nettle, Painted Nettle, Scaredy Cat, Cat/Dog Be Gone, Piss off Plant)
Plectranthus/Solenostemon spp., formerly Coleus

Coltsfoot
Tussilago farfara

Columbine (Aquilegia, Granny's Bonnet, Grannys Bonnet)
Aquilegia spp.

Comfrey
Symphytum officinale

Common Fleabane (Fleabane)
Pulicaria dysenterica; syn. Inula dysenteric

Common Heliotrope (Heliotrope, European Heliotrope, European Turnsole, Caterpilar Weed)
Heliotropium europaeum

Common Knotweed (Knotweed, Prostrate Knotweed, Equal-leaved Knotweed, Wiregrass)
Polygonum arenastrum

Coneflower (Echinacea)
Echinacea

Cordyline (Cabbage Tree, Cabbage Plant, Ti Plant)
Cordyline spp. esp. C. australis, C. indivisa. and C.terminalis

Coreopsis (Tickseed)
Coreopsis spp.

Coriander (Cilantro)
Coriandrum sativum

Corn Marigold (Corn Daisy)
Chrysanthemum segetum

Corn on the Cob (Corn, Sweet Corn, Sweetcorn)
Zea mays

Corn Salad (Lamb's Lettuce; Lambs Lettuce)
Valerianella spp., esp. Valerianella locusta

Corncockle (Corn Cockle, Common Corncockle)
Agrostemma githago; syn. Githago segetum.

Cornflower (Wild)
Centaurea cyanus

Cosmos (Cosmea, Mexican Aster)
Cosmos spp.

Cotoneaster
Cotoneaster spp.

Cotton Lavender (Santolina)
Santolina chamaecyparissus

Couch Grass (Quick Grass, Dog Grass, Witch Grass, Quack Grass)
Elymus repens, syn. Elytrigia repens; Agropyron repens; Triticum repens

Courgette (Zucchini, Baby Marrow)
Cucurbita pepo

Cow Parsley (Wild Chervil)
Anthriscus sylvestris

Cow Parsnip
Heracleum spp.

Cowslip
Primula veris; primula florindae

Crab Apple
Malus sylvestris

Cranberry (American Cranberry, Bog Cranberry)
Vaccinium oxycoccos

Cranesbill Geranium
Geranium spp.

Crape Myrtle
Lagerstroemia indica

Creeping Jenny (Moneywort, Creeping Charlie)
Lysimachia nummularia

Creeping Thistle (Field Thistle, Prickly Thistle, Canada Thistle)
Cirsium arvense

Creeping Yellowcress (Creeping Yellow Cress, Yellow Fieldcress, Keek)
Rorippa sylvestris

Creeping Zinnia (Mexican Creeping Zinnia, Sanvitalia)
Sanvitalia spp.

Cress (Mustard and Cress, Curled Cress, Garden Cress, Peppercress)
Lepidium sativum; Brassica Hirta; Brassica napus

Crocus
Crocus spp.

Crossandra (Firecracker Flower, Kanakamparam)
Crossandra spp., esp. Crossandra infundibuliformis

Crosswort (Smooth Bedstraw)
Cruciata laevipes; syn. Galium laevipes

Croton (Garden Croton, Variegated Croton)
Codiaeum variegatum

Crown Imperial Fritillary (Crown Imperial, Kaiser's Crown)
Fritillaria imperialis

Crown of Thorns
Euphorbia millii

Cuckoo Flower (Lady's Smock, Milkmaid)
Cardamine pratensis

Cucumber
Cucumis sativus

Cuphea (False Heather, Mexican Heather, Cigar Plant, Bat Faced Cuphea)
Cuphea hyssopifolia; Cuphea ignea; Cuphea llavea

Curry Plant
Helichrysum italicum, syn. H. augustifolium

Cyclamen
Cyclamen spp.

Daffodil (Narcissus)
Narcissus spp.

Dahlia
Dahlia spp.

Daisy (English Daisy)
Bellis perennis

Daisy (Lawn Daisy; Common Daisy; English Daisy)
Bellis perennis

Daisy Bush (Brachyglottis)
Brachyglottis.greyi; syn. Senecio greyi

Dame's Violet (Dame's Rocket, Dames Rocket, Dame's Gilliflower, Sweet Rocket, Mother-of-the-Evening, Dames Violet)
Hesperis matronalis

Dandelion
Taraxacum officinale

Daphne
Daphne spp.

Datura (Jimson Weed, Angel's / Angels Trumpet, Devil's Weed, Thorn Apple)
Datura spp.

Day Lily (Daylily)
Hemerocallis

Deadly Nightshade (Belladona)
Atropa belladonna

Deadnettle (Dead Nettle, Red or Purple Deadnettle)
Lamium purpureum

Delphinium (Larkspur)
Delphinium spp.

Desert Willow
Chilopsis linearis

Deutzia
Deutzia spp.

Dianthus (Sweet William, Carnation, Pink, Pinks)
Dianthus spp.

Diascia (Twinspur)
Diascia spp.

Dill (Dill Weed)
Anethum graveolens

Dock
Rumex spp.

Dog's Mercury (Dogs Mercury, Annual Dog's Mercury)
Mercurialis perennis; Mercurialis annua

Dogwood (Common Dogwood, Red Osier Dogwood, Rough Leaved Dogwood)
Cornus spp.

Dracaena (Dragon Tree, Corn Plant, Cornstalk Dracaena, Janet Craig, Ribbon Plant)
Dracaena spp.

Dropwort (Drop Wort, Fern Leaf Dropwort)
Filipendula vulgaris; syn. Filipendula hexapetala, Spiraea filipendula, Ulmaria filipendula

Duckweed (Duck Weed)
Spirodela; Landoltia; Lemna; Wolffiella; Wolffia

Dumb Cane (Dieffenbachia)
Dieffenbachia spp.

Easter Cactus
Rhipsalidopsis gaertneri; Hatiora gaertneri

Echeveria (Hens and Chicks)
Echeveria spp.

Elder ( Elderberry)
Sambucus spp.

Elephant's Ear (Elephants Ear, Alocasia; Taro)
Alocasia spp.

Elephant's Ears (Elephants Ears, Elephants Ear, Bergenia)
Bergenia spp.

Elm (Lacebark Elm, Slippery Elm, Wych Elm, Chinese/American/European White/English Elm)
Ulmus spp.

Elodea (Waterweed, Anacharis)
Elodea spp., syn. Anacharis

Enchanter's Nightshade (Enchanters Nightshade)
Circaea spp.

Endive (Belgium Endive, Chicory)
Chicorum endivia

Escallonia
Escallonia spp.

Eucalyptus (Gum Tree, Blue Gum, Silver Dollar Tree)
Eucalyptus spp.

Euonymus
Euonymus spp.

Euphorbia (Spurge) - Wild Flower
Euphorbia spp.

Euphorbia - Garden
Euphorbia spp.

Euphorbia - Succulent
Euphorbia spp.

Evening Primrose (Pink Evening Primrose, Showy Evening Primrose, Suncups)
Oenothera spp. Oenothera biennis and Oenothera speciosa

Everlasting Flower (Helichrysum, Straw Flower, Everlasting Daisy)
Xerochrysum, syn. Helichrysum, Bracteantha

Fairy Moss (Mosquito Fern)
Azolla spp.

False Castor Oil Plant (Japanese Aralia, Aralia)
Fatsia japonica

False Solomon's Seal (False Spikenard, Treacleberry, False Solomons Seal, False Lily of the Valley, Solomon's Plume)
Maianthemum spp., esp. Maianthemum racemosum; syn. Smilacena racemosa

Fat-hen (Lambs Quarters, Goosefoot, Fat Hen)
Chenopodium album

Fennel
Foeniculum vulgare; syn. Anethum dulce, A. foeniculum, Foeniculum divaricatum, F. officinale, Seseli foeniculum

Ferns

Fescue Grass (Sheeps Fescue; Tall/Red/Blue/Creeping Red/Meadow Fescue)
Festuca spp.

Feverfew
Tanacetum parthenium

Fiber Optic Grass (Rusty Sedge)
Scirpus filiformis; Isolepsis gracilis

Field Madder (Blue Fieldmadder, Fieldmadder)
Sherardia arvensis; syn. Galium sherardia

Field Maple (Hedge Maple, Common Maple)
Acer campestre

Fig Tree
Ficus carica and Ficus spp.

Figwort (Common Figwort, Water Figwort)
Scrophularia spp.

Fir (True Fir)
Abies

Firethorn (Pyracantha)
Pyracantha spp. (esp. Pyracantha coccinea)

Fittonia (Nerve Plant, Mosaic Plant)
Fittonia spp.

Flaming Katy (Kalanchoe)
Kalanchoe Blossfeldiana

Flamingo Flower
Anthurium andreanum

Flax (Linum, Linseed)
Linum spp.

Fleabane Daisy (Dainty Daisy; Summer Starwort, Mexican Fleabane)
Erigeron spp.

Flower-of-an-Hour (Flower of an Hour)
Hibiscus trionum

Flowering Currant (Ribes)
Ribes sanguineum

Flowering Quince (Japanese Quince, Chinese Flowering Quince)
Chaenomeles speciosa; C. japonica; C. cathayensis

Forget-Me-Not (Forget Me Not, Scorpion Grass)
Myosotis spp.

Forsythia
Forsythia spp.

Fountaingrass (Elephant Grass, Fountain Grass, Foxtail, Pennisetum, Napier, Feathertop, Pearl Millet)
Pennisetum spp.

Four O'Clock Flower (Marvel of Peru, Four O'clocks, Four O Clock, Mirabilis)
Mirabilis jalapa

Fox and Cubs (Hawkweed, Orange Hawkweed, Hieracium, Devil's Paintbrush)
Hieracium aurantiacum, syn. Pilosella aurantiaca

Foxglove (Cultivated)
Digitalis spp.

Foxglove (Wild)
Digitalis purpurea

Frangipani (Plumeria)
Plumeria spp.

Freesia
Freesia spp.

French Marigold (African Marigold, Marigold)
Tagetes spp.

Friendship Plant (Pilea, Moon Valley Plant)
Pilea mollis; P. involucrata; P. crassifolia

Fringecup (Tellima, Fringe Cup, Fringecups, Bigflower Tellima, False Alum Root)
Tellima grandiflora

Frisée (Frisee, Escarole) Lettuce
Chicorum endivia

Fritillary (Snake's Head Fritillary, Snakes Head Fritillary, Siberian Fritillary, Mission Bells)
Fritillaria spp.

Fuchsia
Fuchsia spp.

Fumitory
Fumaria spp.

Gallant Soldier/Shaggy Soldier (Small-flowered Quickweed, Potato Weed, Fringed Quickweed, Hairy Galinsoga)
Galinsoga parviflora; G. quadriradiata

Gardenia (Cape Jasmine)
Gardenia spp., esp. Gardenia jasminoides

Garlic Mustard (Jack-by-the-Hedge; Jack by the Hedge)
Alliaria petiolata

Gasteria
Gasteria spp.

Gayfeather (Blazing Star, Liatris)
Liatris spp., esp. Liatris spicata

Gazania
Gazania spp.

Gentian (Bitterwort, Bitter Root)
Gentiana spp.

Geranium (Small and large hardy perennials)
Geranium

Gerbera
Gerbera spp.

Geum - Garden Plant
Geum spp., esp. Geum chiloense

Giant Cane (Arundo Donax, Spanish Cane, Wild Cane, Giant Reed)
Arundo donax

Giant Hyssop (Agastache, Anise Hyssop, Licorice Mint, Hummingbird Mint)
Agastache spp.

Ginkgo (Maidenhair Tree, Gingko, Ginko, Ginkgo Biloba)
Ginkgo biloba; syn. Salisburia adiantifolia

Gladiolus (Gladioli, Gladiola)
Gladiolus spp.

Globe Artichoke (Cardoon)
Cynara scolymus; Cynara cardunculus

Globe Thistle (Great Globe Thistle)
Echinops spp.

Gloxinia (Florists Gloxinia, Tuberous Gloxinia)
Sinningia speciosa

Goat's Beard (Goats Beard, Salsify, Jack-Go-To-Bed-At-Noon)
Tragopogon spp.

Goat's Rue (Goats Rue)
Galega officinalis

Golden Shrimp Plant (Lollypop Plant, Yellow Shrimp Plant, Golden Candles)
Pachystachys lutea

Goldenrod (Golden Rod)
Solidago spp.

Good King Henry
Chenopodium bonus-henricus

Goose Grass (Cleavers, Stickywilly, Sticky Bud, Stickyweed, White Bedstraw)
Galium aparine, Galium mollugo, Galium album

Gooseberry
Ribes uva-crispa; syn. R. grossularia

Gorse (Furze, Whin)
Ulex spp.

Grape
Vitis spp.

Grape Hyacinth
Muscari spp.

Grape Ivy (Oak Leaf Ivy)
Cissus rhombifolia

Grape Vine
Vitis spp.

Grass Vetchling (Pea Vetchling)
Lathyrus nissolia

Greater Celandine
Chelidonium majus

Green Alkanet (Alkanet, Evergreen Bugloss)
Pentaglottis sempervirens

Ground Elder
Aegopodium podagraria

Ground Ivy (Creeping Charlie, Creeping Charley, Gill-over-the-Ground)
Glechoma hederacea, Syn. Nepeta glechoma

Groundsel
Senecio vulgaris

Gunnera (Giant Rhubarb)
Gunnera spp.

Gypsophila (Baby's Breath, Bridal Wreath, Soap Wort)
Gypsophila spp.

Harebell (Hare Bell, Bluebell, Bellflower)
Campanula rotundifolia

Hawk's-beard ( Hawksbeard )
Crepis spp.

Hawkbit (False Dandelion, Desert Chicory)
Leontodon spp.

Hawkweed (Hieracium)
Hieracium spp.

Haworthia
Haworthia spp.

Hawthorn
Crataegus spp.

Hazel (Filbert, Kentish Cob, Cob)
Corylus spp.

Heartleaf Iceplant (Baby Sun Rose; Aptenia)
Aptenia cordifolia

Heath
Erica spp.

Heather
Calluna spp.

Hebe
Hebe spp.

Hedge Mustard (Common Hedge Mustard, Oriental Mustard, English Watercress)
Sisymbrium officinale

Hedge Woundwort
Stachys sylvatica

Heliotrope (Turnsole, Indian Turnsole, Cherry Pie)
Heliotropium spp.

Hellebore (Christmas Rose)
Helleborus spp.

Hemlock (Poison Hemlock)
Conium maculatum

Hemp Agrimony (Joe Pye Weed)
Eupatorium cannabinum; Eupatorium purpureum

Hemp Nettle (Hempnettle)
Galeopsis tetrahit; Galeopsis bifida

Henbit (Henbit Deadnettle)
Lamium amplexicaule

Herb Hyssop (Hyssop)
Hyssopus officinalis

Herb Paris (True Lover's Knot, Devil-in-a-Bush)
Paris quadrifolia

Herb Robert
Geranium robertianum

Heuchera
Heuchera spp.

Hibiscus (China Rose, Shoeblackplant, Chinese Hibiscus, Mediterranean Hibiscus, Shoe Flower)
Hibiscus rosa-sinensis

Hibiscus (Rose of Sharon)
Hibiscus syriacus & spp.

Himalayan Balsam (Policeman's Helmet, Poor Man's Orchid)
Impatiens glandulifera

Himalayan Honeysuckle (Leycesteria, Pheasant Berry)
Leycesteria formosa

Hoary Cress (Whitetop, White Top)
Lepidium draba; syn. Cardaria draba

Hog Weed (Common Hogweed, Hogweed)
Heracleum sphondylium

Holly
Ilex aquifolium

Hollyhock
Alcea rosea

Honesty
Lunaria annua, syn. Lunaria biennis

Honeysuckle
Lonicera spp.

Honeywort (Cerinthe; Blue Shrimp Plant)
Cerinthe major; Cerinthe retorta

Hop Clover
Trifolium campestre

Hops
Humulus lupulas

Hornwort
Ceratophyllum spp.

Horse Chestnut (Chestnut, Conker Tree, Buckeye)
Aesculus spp.

Horseherb (Horse Herb, Straggler Daisy, Lawnflower)
Calyptocarpus vialis; syn. Synedrella vialis

Horseradish
Armoracia rusticana

Horsetail
Equisetum spp.

Horseweed (Canadian Fleabane, Mare's Tail, Hairy Fleabane)
Conyza canadensis (formerly Erigeron canadensis)

Hosta (Plantain Lily)
Hosta spp.

Hottentot Fig (Ice Plant, Iceplant, Pigface)
Carpobrotus edulis

House Leek (Sempervivum; Hens and Chicks)
Sempervivum spp.

Hoya (Wax Plant)
Hoya spp.

Hyacinth
Hyacinthus orientalis

Hydrangea
Hydrangea spp.

Ice Plant (Iceplant)
Sedum spectabile; Hylotelephium spectabile

Ice Plant (Iceplant, Trailing Ice Plant, Dew Flower)
Delosperma spp.; Lampranthus spp.; Drosanthemum spp.

Iceberg Lettuce
Lactuca sativa

Indian Bean Tree (Catalpa, Cigar Tree)
Catalpa spp.

Iris (Flag Iris, Bearded Iris, Reticulated Iris)
Iris spp.

Iris (Yellow Flag, Flag Iris, Water Iris, Water Flag)
Iris pseudacorus; I. laevigatae; I. versicolour; I. virginica

Ivy (English Ivy)
Hedera spp. (esp. Hedera Helix)

Ivy Leaved Toadflax (Kenilworth Ivy)
Cymbalaria muralis

Jacaranda (Blue Jacaranda, Black Poui, Fern Tree, Carob Tree)
Jacaranda spp.; esp. J. mimosifolia

Jacob's Ladder (Jacobs Ladder, Greek Valerian)
Polemonium spp. esp. Polemonium caeruleum

Jade Plant (Friendship Tree, Money Plant, Money Tree, Crassula Ovata)
Crassula ovata; Crassula argentea; Crassula portulacea

Japanese Anemone
Anemone hupehensis; Anemone x hybrida

Japanese Knotweed
Fallopia japonica, syn. Reynoutria japonica, syn. Polygonum cuspidatum

Japanese Painted Fern
Athyrium niponicum

Jasmine
Jasminum spp.

Jerusalem Artichoke (Sunroot)
Helianthus tuberosus

Jerusalem Cherry (Winter Cherry)
Solanum pseudocapsicum

Jerusalem Sage (Phlomis; Lampwick Plant)
Phlomis spp.

Juncus (Rush)
Juncus spp.

Juniper
Juniperus communis

Jute Mallow (Jute, Jew's Mallow, Bush Okra, Egyptian Spinach, Saluyot)
Corchorus olitorius

Kale (Curly Kale, Collard Greens, Spring Greens)
Brassica oleracea (Acephala Group)

Kangaroo Apple (Poroporo)
Solanum aviculare

Kerria (Bachelor's Buttons, Bachelors Buttons, Japanese Rose)
Kerria japonica (Pleniflora)

Kidney Vetch (Woundwort, Ladies Fingers)
Anthyllis vulneraria

Kidney Weed (Dichondra, Wonderlawn, Mercury Bay Weed)
Dichondra spp.

Knapweed
Centaurea scabiosa; C. nigra; C. stoebe and spp.

Knautia Macedonica
Knautia Macedonica

Kohlrabi (Turnip Cabbage, Turnip-rooted Cabbage)
Brassica oleracea (Gongylodes group)

Laburnum (Golden Chain Tree, Golden Rain Tree)
Laburnum spp.

Lady's Bedstraw (Ladys Bedstraw, Yellow Bedstraw)
Galium verum

Lady's Mantle (Ladys Mantle, Ladies Mantle)
Alchemilla spp.

Lady's Purse (Slipper Flower, Calceolaria, Pocketbook Flower, Ladies Purse, Slipperwort)
Calceolaria spp.

Lamb's Ear (Lambs Ear)
Stachys byzantina

Lamb's Lettuce (Lambs Lettuce)
Valerianella locusta; syn. Valerianella olitoria

Lantana (Shrub Verbena)
Lantana spp.

Laurel (English Laurel, Cherry Laurel)
Prunus laurocerasus

Lavatera
Lavatera spp.

Lavender
Lavandula spp.

Lemon
Citrus limon

Lemon Balm
Melissa officinalis

Leopard's Bane (Leopards Bane)
Doronicum spp. (esp. Doronicum orientale; syn. D. caucasicum)

Lesser Celandine (Harbinger-of-Spring)
Ranunculus ficaria

Lewisia (Bitterroot, Bitter Root)
Lewisia spp., esp. L. cotyledon and L. rediviva

Ligularia (Leopard Plant, Summer Ragwort, Ragwort Flower)
Ligularia spp., esp. Ligularia dentata, L. przewalskii and L. stenocephala

Lilac
Syringa spp.

Lily
Lilium spp.

Lily of the Valley
Convallaria majalis

Lily Turf (Border Grass, Monkey Grass, Spider Grass, Liriope, Big Blue Lilyturf, Aztec Grass)
Liriope spp.

Lime (Linden, Lime Tree, Common Lime, Basswood)
Tilia spp.

Lipstick Plant
Aeschynanthus spp.

Liquidambar (Liquid Ambar, Red Gum, Sweetgum, Sweet Gum, American Sweetgum, Storax)
Liquidambar spp.

Lisianthus (Eustoma, Texas Bluebell, Prairie Gentian)
Eustoma grandiflorum; syn., Lisianthus russellianus, Bilamista grandiflora

Livingstone Daisy (Mesembryanthemum, Ice Plant, Iceplant)
Mesembryanthemum criniflorum; syn. Dorotheanthus bellidiformi

Lobelia
Lobelia spp.

London Plane (London Planetree, Hybrid Plane)
Platanus x acerifolia

London Pride
Saxifraga (Section Gymnopera); Saxifraga spathularis x umbrosa/Saxifraga x urbium

Lords and Ladies (Jack-in-the-Pulpit, Jack in the Pulpit, Cuckoo-Pint, Cuckoo Pint, Wild Arum)
Arum spp. esp. Arum maculatum

Lovage
Levisticum officinale

Love-In-A-Mist (Love in a Mist)
Nigella damascena

Love-Lies-Bleeding (Love Lies Bleeding, Amaranthus)
Amaranthus caudatus

Lucky Bamboo (False Bamboo, Bamboo, Belgian Evergreen)
Dracaena sanderiana

Lupin (Blue Bonnet, Bluebonnet, Lupine)
Lupinus spp.

Lychnis (Rose Campion)
Lychnis coronaria

Magnolia
Magnolia spp.

Mahonia (Oregon Grape)
Mahonia spp.

Maize (Corn)
Zea mays

Malabar Spinach (Ceylon Spinach, Climbing Spinach, Vine Spinach)
Basella alba; Basella rubra.

Mallow
Malva spp.

Malope Mallow (Annual Malope, Spanish Mallow, Mallow Wort, Large-flowered Mallow Wort)
Malope trifida

Maltese Cross (Jerusalem Cross, Nonesuch, Flower of Bristol)
Lychnis chalcedonica; syn. Silene chalcedonica

Mandevilla (Dipladenia, Brazilian Jasmine, Chilean Jasmine)
Mandevilla spp., syn. Dipladenia splendens

Marguerite Daisy
Argyranthemum frutescens; Leucanthemum vulgare; Chrysanthemum leucanthemum; Chrysanthemum frutescens, Chrysanthemum superbum

Marigold (Pot Marigold, Field Marigold, Calendula)
Calendula spp.

Marjoram (Sweet/Hardy/Knotted Marjoram)
Origanum majorana

Marrow (Vegetable Marrow)
Cucurbita pepo

Marsh Marigold (Kingcup)
Caltha palustris

Marsh Woundwort (Marsh Hedgenettle, Hedge Nettle)
Stachys palustris

Mask Flower
Alonsoa meridionalis

Mazus
Mazus reptans

Meadow Rue (Thalictrum)
Thalictrum spp.

Meadow Vetchling
Lathyrus pratensis

Meadowsweet (Meadow Sweet)
Filipendula ulmaria; syn. spiraea ulmaria

Meconopsis (Himalayan Poppy, Himalayan Blue Poppy)
Meconopsis betonicifolia; M. gakyidiana; M. bailey

Melilot (Yellow Melilot, White Melilot, Sweet Clover, Honey Clover,Common Melilot, Ribbed Melilot)
Melilotus spp.

Melon (Cantaloupe, Muskmelon, Watermelon, Ogen Melon, Honeydew, Galia)
Citrullus lanatis spp., Cucumis melo spp.

Mexican Orange Blossom (Mock Orange)
Choisya ternata

Mexican Petunia (False Petunia, Wild Petunia, Britton's Wild Petunia, Monkey Plant)
Ruellia spp; esp. Ruellia brittoniana, Ruellia makoyana, Ruellia portellae

Michaelmas Daisy
Aster

Mignonette, (Wild Mignonette, Dyer's Rocket, Dyers Rocket, Weld, Sweet Reseda)
Reseda spp.

Milk Thistle (Blessed Thistle, Mary Thistle)
Silybum marianum

Milk Vetch
Astragalus spp.

Milkweed (Common Milkweed, Butterfly Weed, Silk Weed)
Asclepias spp., esp. Asclepias syriaca

Millet (Proso Millet, Common Millet, Hog Millet, White Millet)
Panicum miliaceum

Million Bells (Calibrachoa)
Calibrachoa spp., esp. C. x hybrida

Mimosa
Acacia dealbata

Mimulus (Monkey Flower)
Mimulus spp.

Mind-Your-Own-Business (Mind Your Own Business, Baby's Tears)
Soleirolia soleirolii

Miner's Lettuce (Winter Purslane, Miners Lettuce)
Claytonia perfoliata, syn. Montia perfoliata

Mint (Garden Mint, Spearmint, Apple Mint)
Mentha sachalinensis; M. spicata, M. sauveolens

Mistletoe
Viscum album; Phoradendron leucarpum

Mock Orange
Philadelphus coronarius

Monstera (Swiss Cheese Plant, Mexican Breadfruit, Split Leaf Philodendron)
Monstera spp.

Montbretia (Crocosmia, Copper Tips, Falling Stars)
Crocosmia spp.

Morning Glory
Ipomoea spp.

Moss Rose
Portulaca grandiflora

Mossy Saxifrage (Stone Breaker, Stonebreaker)
Saxifraga (Section Saxifraga); esp. Saxifraga hypnoides; S. x arendsii; S.moschata

Mother of Pearl Plant (Ghost Plant, Dream Plant, Leatherpetal, Mother-of-Pearl Plant)
Graptopetalum paraguayense; syn. Sedum weinbergii; Echeveria weinbergii

Mother of Thousands (Mexican Hat, Chandelier Plant, Devils Backbone, Alligator Plant)
Kalanchoe daigremontiana, syn. Bryophyllum daigremontianum; Kalanchoe delagoensis, syn. K. tubiflora

Mother-in-Law's Tongue (Mother in Laws Tongue, Devil's Tongue, Snake Plant, Snake Tongue)
Sansevieria spp.

Mountain Ash (Rowan)
Sorbus aucuparia; S. americana; S. glabrescens; S. cashmiriana

Mountain Laurel (Calico Bush)
Kalmia latifolia

Mouse-ear Hawkweed (Hieracium, Hawkweed)
Hieracium pilosella, syn. Pilosella officinarum

Mugwort (Common Wormwood)
Artemisia spp.

Mulberry Tree (Mulberry Bush, Paper Mulberry)
Morus spp.; Broussonetia papyrifera

Mullein (Verbascum, Great Mullein, Common Mullein, Aaron's Rod, Cowboy Toilet Paper)
Verbascum spp.

Mushroom (Toadstool, Fungus, Fungi)
Some of the common edible ones: Agaricus bisporus, Agaricus campestris, Lycoperdon perlatum, Cantharellus cibarius, Boletus edulis, Clitocybe nuda, Macrolepiota procera, Lentinula edodes, Pleurotus ostreatus

Musk Mallow
Malva Moschata

Myrtle (Common Myrtle; True Myrtle; Sweet Myrtle)
Myrtus communis

Nasturtium
Tropaeolum majus

Navelwort (Wall Pennywort, Navel Wort, Penny-pies, Pennywort, Kidneywort, Dollar Weed)
Umbilicus rupestris

Nectarine (Fruit)
Prunus persica, var. nectarina

Nectarine (Tree)
Prunus persica, var. nectarina

Nemesia
Nemesia spp.

Nerine (Guernsey Lily)
Nerine spp.

Nettle (Stinging Nettle)
Urtica dioica

Nipplewort
Lapsana communis

Oak tree
Quercus spp.

Oat (Oatgrass, Oat Grass, Oats, Wild Oats)
Avena spp.

Oilseed Rape (Rape, Oil Seed Rape)
Brassica napus

Okra (Lady’s Fingers, Ladies Fingers, Bhindi)
Abelmoschus esculentus

Oleander
Nerium oleander

Olive
Olea europaea

Onion (Garden Onion, Common Onion, Bulb Onion)
Allium cepa

Opuntia Cactus (Prickly Pear/Nopales)
Opuntia spp.

Orache (Orach, Saltbush, Wheelscale Saltbush, Common/Spear-leaved/Garden/Red Orache)
Atriplex spp. esp. A. hortensis, A. patula, A. elegans

Oregano
Origanum vulgare spp.

Oriental Poppy
Papaver orientalis

Osteospermum (African Daisy, Blue-eyed Daisy, Cape Daisy, Blue Eyed Daisy, South African Daisy, Cape Marigold, Spoon Daisy)
Osteospermum spp; Dimorpotheca spp..

Ox-eye Daisy (Oxeye Daisy, Ox Eye Daisy)
Leucanthemum vulgare, syn. Chrysanthemum leucanthemum

Pachyphytum Bracteosum
Pachyphytum bracteosum

Paddle Plant (Flapjack Plant, Red Lips Kalanchoe, Desert Cabbage)
Kalanchoe luciae; syn. Kalanchoe thyrsiflora

Pampas Grass
Cortaderia selloana

Panda Plant (Chocolate Soldier, Pussy Ears, Felt Bush, Elephant Ear Kalanchoe)
Kalanchoe tomentosa; Kalanchoe beharensis

Pansy
Viola x wittrockiana/Viola tricolor hortensis

Parlour Palm (Neanthe Bella Palm, Parlor Palm, Table Top Palm)
Chamaedorea elegans

Parrot Feather (Water Milfoil)
Myriophyllum aquaticum

Parsley
Petroselinum hortense, Petroselinum crispum

Parsnip
Pastinaca sativa

Pasque Flower (Pasqueflower, Wind Flower, Prairie Crocus, Easter Flower)
Pulsatilla spp., esp. P. vulgaris and P. vulgaris alba

Passion Flower (Passionfruit Vine)
Passiflora spp.

Pea (Pea Shoots, Pea Sprouts, Mangetout, Snow Pea, Snap Pea)
Pisum sativum

Peace Lily (White Anthurium, Spath, Spathe Flowers)
Spathiphyllum spp. esp. S. wallisii

Peach (Fruit)
Prunus persica

Peach Tree
Prunus persica

Pear (Fruit)
Pyrus spp.

Pear Tree
Pyrus spp.

Pearly Everlasting (Pearl Everlasting, Western Pearly Everlasting, Anaphalis)
Anaphalis spp., esp. Anaphalis margaritacea

Pelargonium (Geranium)
Pelargonium spp.

Pennyroyal (Penny Royal)
Mentha pulegium

Penstemon (Beard-tongue, Beardtongue)
Penstemon spp.

Pentas (Starcluster, Egyptian Starcluster, Star Cluster)
Pentas lanceolata

Peony (Paeony)
Paeonia spp.

Peperomia
Peperomia spp.

Peppermint
Mentha piperita

Perennial Wall Rocket (Wall Rocket, Wild Rocket, Sand rocket, Sand Mustard, Lincoln Weed and White Rocket)
Diplotaxis tenuifolia,

Perilla (Beefsteak Plant, Purple Mint, Shiso)
Perilla spp.

Periwinkle (Vinca)
Vinca major/minor

Persian Buttercup (Turban Buttercup, Ranunculus, Persian Crowfoot)
Ranunculus asiaticus

Persicaria (Red Leg, Redshank, Pale Persicaria, Lady's Thumb)
Persicaria maculosa; Persicaria lapathifolia

Petunia
Petunia spp.

Phacelia, (Scorpion Weed, Tansy Leaved Phacelia, Scorpionweed, Wild Heliotrope, Fiddleneck, Lacy Phacelia, California Bluebell)
Phacelia spp., esp. P. tenacetifolia, P. campanularia

Pheasants Eye (Summer Pheasant's Eye, Blooddrops, Adonis Flower, Soldier in Green, Red Morocco, Red Chamomile)
Adonis aestivalis

Philodendron
Philodendron spp.

Phlox
Phlox spp.

Photinia (Red Robin)
Photinia spp. esp. Photinia x fraseri

Pieris (Forest Flame, Japanese Pieris, Lily of the Valley Bush)
Pieris japonica

Pine
Pinus spp.

Pineapple
Ananas comosus

Pineapple Weed (Disc Mayweed, Wild Chamomile)
Matricaria discoidea

Pink Purslane (Siberian Spring Beauty, Spring Beauty, Siberian Miner's Lettuce, Candy Flower)
Claytonia sibirica

Pittosporum (Cheesewood)
Pittosporum spp.

Plantain (Broadleaf) (Broad-leaved Plantain, Greater Plantain, Common Plantain, Hoary Plantain, Rat-tail Plantain, Rat's Tail Plantain)
Plantago major; Plantago media

Plantain (Buck's Horn) (Stag's Horn Plantain, Buckshorn Plantain, Sea Plantain, Seaside Plantain)
Plantago coronopus; Plantago maritima

Plantain (Ribwort) (Narrowleaf Plantain, Narrow Leaf Plantain, English Plantain)
Plantago lanceolata

Plum — Fruit (Greengage, Gage)
Prunus domestica

Plum — Tree, (Greengage, Gage)
Prunus domestica

Plumbago (Leadwort)
Plumbago spp.

Poached Egg Plant (Meadow Foam)
Limnanthes douglasii

Poinsettia
Euphorbia pulcherrima

Pokeweed (Pokeberry, Poke, Pokebush)
Phytolacca spp.

Polka Dot Plant (Polka-dot Plant, Hypoestes, Freckle Face, Flamingo Plant)
Hypoestes phyllostachya

Pomegranate (Fruit)
Punica granatum; syn. Punica malus

Pomegranate Shrub
Punica granatum; syn. Punica malus

Poplar (Black Poplar, Lombardy Poplar, European Aspen, Cottonwood, Water Poplar, White Poplar)
Populus spp.

Poppy (Common Poppy, Field Poppy, Corn Poppy, Flanders Poppy)
Papaver spp.

Potato
Solanum tuberosum

Potentilla (Cinquefoil) - Garden Perennial
Potentilla atrosanguinea

Potentilla (Cinquefoil) Shrub
Potentilla fruticosa

Prayer Plant
Maranta leuconeura; Calathea spp.

Prickly Lettuce ( North and South Plant, Compass Plant, Milk Thistle)
Lactuca serriola

Prickly Poppy (Argemone, Thorn Apple)
Argemone spp

Primrose (English Primrose, Wild Primrose, Common Primrose, Native Primrose)
Primula vulgaris

Primula (Primrose, Polyanthus)
Primula spp.

Privet
Ligustrum spp.

Pulmonaria (Lungwort)
Pulmonaria spp.

Pumpkin
Curcurbita pepo

Purple Bell Vine (Rhodochiton)
Rhodochiton spp

Purple Loosestrife
Lythrum salicaria

Purple Loosestrife
Lythrum salicaria

Purpletop Vervain (Tall Verbena, Argentinian Vervain, Purple Top, Clustertop)
Verbena bonariensis

Purslane (Common Purslane)
Portulaca oleracea

Quince (Fruit)
Cydonia oblonga

Quince Tree
Cydonia oblonga

Radicchio (Italian Chicory, Escarole)
Chicorum intybus

Radish
Raphanus sativus

Ragged Robin
Lychnis flos-cuculi

Ragweed (Common Ragweed, American Wormwood, Bitterweed, Bloodweed)
Ambrosia spp.

Ragwort (Oxford Ragwort, Tansy Ragwort, Stinking Willie)
Senecio spp; esp. Senecio jacobaea, Senecio squalidi, syn. Jacobaea vulgaris

Raspberry
Rubus spp., esp. Rubus idaeus

Rayless Goldenrod (Jimmyweed, Jimmy Weed, Southern Goldenbush)
Isocoma pluriflora (syn. Haplopappus heterophyllus; syn. Haplopappus pleuriflorus; syn. Icocoma wrightii)

Red Bartsia (Bartsia)
Odontites vernus

Red Bistort (Mountain Fleece)
Persicaria amplexicaulis

Red Currant (Redcurrant)
Ribes rubrum

Red Hot Poker
Kniphofia

Red Leaf Lettuce (Lollo Rosso)
Lactuca sativa

Red Maple
Acer rubrum

Red Pitaya (Dragonfruit, Hylocereus)
Hylocereus spp.

Red Valerian (Jupiter's Beard, Spur Valerian, Kiss Me Quick)
Centranthus ruber; Centranthus ruber 'albus'

Rest Harrow (Restharrow, Spiny Rest Harrow, Shrubby Rest Harrow)
Ononis spp

Rhipsalis (Mistletoe Cactus)
Rhipsalis spp.

Rhododendron
Rhododendron spp.

Rhubarb
Rheum spp.

Rock Cress (Rockcress, Arabis)
Arabis spp.

Rock Rose (Sun Rose)
Helianthemum nummularium

Rocket (Arugula, Rucola, Salad Rocket)
Eruca sativa, Eruca vesicaria

Romaine Lettuce (Garden Lettuce, Cos Lettuce).
Lactuca sativa

Rose
Rosa spp.

Rosebay Willowherb (Rosebay Willow Herb, Great Willowherb, Fireweed)
Chamaenerion angustifolium

Rosemary
Rosmarinus officinalis

Roundleaf Cranesbill Geranium (Round-leaved Crane's-bill, Round leaf Geranium)
Geranium rotundifolium

Rue (Common Rue, Herb of Grace)
Ruta spp., esp. Ruta graveolens

Russian Sage
Perovskia atriplicifolia

Russian Vine (Mile-a-Minute, Mile a Minute)
Fallopia baldschuanica (Polygonia baldschuanica)

Safflower (Saffron Thistle)
Carthamus tinctorius

Sage
Salvia officinalis

Sainfoin
Onobrychis viciifolia; Onobrychis spp.

Salad Burnet, Garden Burnet, Small Burnet
Sanguisorba minor

Salvia
Salvia spp.

Sambucus Nigra (Cut Leaved Elder, Common Elder/Elderberry; Black Elder)
Sambucus Nigra

Saxifrage (Stonebreaker, Stone Breaker, Rockfoil, Golden/Opposite Leaved Saxifrage)
Saxifraga spp; but esp. S.fortunei, S. rotundifolia, S. epiphylla, S. stolonifera

Scabious (Scabios, Field Scabious, Pincushion Flower)
Scabiosa spp.; Knautia arvensis

Scarlet Pimpernel (Poor Man's Weatherglass, Red Chickweed)
Anagallis arvensis

Scentless Mayweed (Mayweed, False Chamomile)
Matricaria perforata; Tripleurospermum inodorum

Scilla/Squill
Scilla spp.

Scotch Thistle (Cotton Thistle)
Onopordum acanthium

Scurvy Grass (Scurvy-grass, Scurvygrass, Early/Danish/Estuarine/Common/English Scurvy Grass, Spoonwort, Scruby Grass)
Cochlearia spp.

Sea Holly
Eryngium spp; esp. Eryngium maritimum and Eryngium bourgatii

Seaside Daisy (Sea Daisy, Seaside Fleabane, Beach Aster)
Erigeron glaucus

Sedum (Stonecrop)
Sedum spp.

Sedum Acre (Biting Stonecrop, Gold Moss, Wall Pepper)
Sedum acre

Sedum Album (White Stone Crop)
Sedum album

Sedum Reflexum
Sedum reflexum; syn. Sedum rupestre

Sedum Spurium (Dragon's Blood Sedum; Tricolour Stonecrop; Two Row Stonecrop)
Sedum spurium

Self-heal (Selfheal, Self Heal)
Prunella spp.

Sensitive Plant (Mimosa, Humble Plant, Touch Me Not, Shameplant)
Mimosa pudica

Shasta Daisy (Marguerite, Giant Marguerite)
Leucanthemum superbum, syn. Chrysanthemum superbum; Chrysanthemum maximum

Shepherd's Purse (Shepherds Purse)
Capsella bursa-pastoris