Celtis pallida (Desert hackberry) (aka Celtis ehrenbergiana). (Sunset: 10-13; USDA: 7-10. Full sun. Spiny semi-evergreen shrub, up to 20' tall, 8' spread; small dark green leaves. Drought hardy. Origin: Texas, New Mexico, northern Mexico from 3000 to 8000' elevation. Approx. 350 seeds per oz.