This is a euphorbia:
Astounding thorns, poisonous sap. It is from a land of tenacious razor-toothed grazers and so makes no apologies about any of this.
I wrote some thorns into a scene in STAYS a while ago. They aren't the focus, just a background touch, but doing the initial rewrites, I noticed them again. I wrote a poem yesterday--first poem in a while. It felt nice.