This might be the only plant in cultivation around here, though the honey mesquite, Prosopis glandulosa, does make it into southeastern Colorado, on the Mesa de Maya, at least. The mesquite has been in the garden here for quite some time, and does not, I believe, originate from the Colorado populations. It’s just a reg’lar ole mesquite. Same thing people use to overpower smoked and grilled foods with mesquite flavor.
First time it’s bloomed, or, more accurately, it’s the first time I’ve noticed it. The flower is there, right in the middle.
Cool spines, too. (I took both these pictures with the Coolpix in full sun.)