Spellenberg R, Wootten T (1999) VASCULAR PLANTS ON A GYPSUM OUTCROP IN SOUTHERN NEW MEXICO: A LISTING, A NEW VARIETY AND TAXONOMIC REALIGNMENTS IN THE ANULOCAULIS LEIOSOLENUS COMPLEX (NYCTAGINACEAE), AND A NEW VARIETY OF MENTZELIA HUMILIS (LOASACEAE). Sida, Contributions To Botany 18(4): 987-999. Retrieved from http://www.jstor.org/stable/41967705
There is no corrections for Anulocaulis leiosolenus var. gypsogenus yet.