Common Name: Penstemon (Beard-tongue, Beardtongue)
Latin Name:Penstemon spp.
Family Name: Scrophulariaceae
Penstemons are known to accumulate selenium from the soil, and a high level of selenium intake is known to cause respiratory difficulties, weight loss and paralysis in horses, so as it would be very difficult to know the selenium content of any particular Penstemon plant, and as we don't know its effect on tortoises, we recommend that you err on the side of caution and do not feed this plant to your tortoise.
This is a wild flower, but is also cultivated and found in many gardens.