Because of a big project planned for this May in a sandy xeric area, I had posted a question about which greggii and microphylla might be good for this cold end of zone 7. Richard gave me a nicely detailed reply with a number of recommendations. I didn't have a lot of past experience with microphylla. Only Wild Watermelon and San Carlos Festival have been established in the garden. So I wasn't really prepared for the diversity in this species. Somewhere I read there were several very distinct populations and that the species itself was quite widespread in Mexico. Microphylla Orange Door and neurepia seem to share a singular vigor and the leaves seem similar with the latters leaves being much more pointy. At least at this stage they are very different from Wild Watermelon,San Carlos Festival, Hot Lips, or any of several others.
So can anyone direct me to a place where I can find out more? Not knowing the story bothers me a bit.