This came up in an area where other natives were transplanted about 5-6 years ago. I've not seen it until this year and can't identify it.
Some sort of Euphorbia?
I was also going to say euphorbia, but I don't know enough about euphorbias to be able to say for sure
Thanks! That seems to fit. Wow...so many euphorbias. I still haven't figured out which one this is and if I should keep it.
Can you give us a general idea of where you are? That may limit the choice of Euphorbias.
I've peered long and hard at this picture and I can't see any flowering parts in it which say Euphorbia to me. I'm wondering it this is some sort of aberration like phyllody. Is there any Evening Primrose nearby? I think it could be an Oenothera sp with phyllody.