Is this velvet mesquite, Prosopis velutina, or honey mesquite, Prosopis glandulosa? It is still too young to identify. I suspect that it is velvet mesquite because I found its seed in a landscape in Surprise, Arizona, and velvet mesquite is the most common species within landscapes there. Also, the foliage of the trees that provided the seed resembled that of velvet mesquite more than that of honey mesquite, with relatively smaller leaflets. The bark was medium brown, so was not quite as dark brown as I would expect for velvet mesquite, but more brown than tan, as I would expect for honey mesquite. This little seedling may not look like much now, but it is the only survivor of the many seed that I collected. Only a few germinated, and slugs ate them before they extended their first leave beyond their cotyledons. This seedling germinated last, and was promptly canned in a four inch pot that I brought inside at night for protection. I hope that, before the end of summer, it grows large enough to survive winter. It should. Regardless of its identity, I hope to eventually use its stems for smoking and, if it grows large enough, barbecuing.