Latin Name:Crassula ovata; Crassula argentea; Crassula portulacea
Family Name: Crassulaceae
These Crassulas are classed by some sources as being mildly toxic, contain oxalic acid and, like most succulents, can cause diarrhoea if eaten in excess. Many tortoises don't bother with them, but feeding small amounts will do no harm.
Several varieties of Crassula ovata, like the 'Gollum' and 'Hobbit' have some leaves that curve inward and fuse into a tube shape.