It looks like it's in the carrot family. There are many highly toxic plants (poison hemlock, giant hogweed) in that family as well as a few edible ones (carrots, fennel, parsley) . I would recommend against feeding it unless you're 100% sure what it is.
Hi all, we've had our CA desert tortoise for about 20 years. She lives in our backyard grazing half the year and in a box in the garage from about Thanksgiving to Easter. We're in coastal southern California.
When we bring her out of the garage in the spring, I give her a soak in lukewarm water...