Eriogonum atrorubens Engelm. Eriogonum atrorubens Engelm., Memoir Tour N. Mexico [Wislizenus]: 108–109. 1848 sec. Villaseñor 2016=Pterogonum atrorubens Engelm. in Bot. Jahrb. Syst. 49(2): 239. 1913 syn. sec. ???