Is this flower safe?

[Leo-Land]

I have these flowers all around my house. They are a sort of Cacti. I was wondering if they are okay to feed just the pedals of this flower to my Uromastyx. I would only feed the pedals because there are little thorny things that come off (like on the cacti itself) of the base of the flower. Please tell me if they can eat these!

http://www.leo-land.net/flower.jpg

http://www.leo-land.net/flower2.jpg