Don’t be scared off by the name, it’s not gonna bite you.
This little tuber looks like the tail of a rattlesnake, hence the name. A more common name is Florida Wood Betony.
This plant is in the mint family.
above ground parts — read young plants and leaves — can be cooked like greens.
Green Deane has an imformative post on his website about Florida Betony
Stachys Floridana is the scientific botanical name