Mexico, Coahuila, Cultivated at Desert Botanical Garden Maricopa Co., Phoenix, AZ. 33 degrees 27' 33'' N, 111 degrees 56' 35'' W. elevation 1100 ft; No accession number. Possibly grown from seed originally collected by Rodney Engard, s.n., from Coahuila, Mexico.
27.333333 -102 +-300000m.
Shrub to 3 m tall, bark silvery-white; flwoers yellow.