STEMS: mostly to 10-20 cm long; leaf blades mostly ovate, broadly elliptic or circular, grading to narrowly ovate or broadly lanceolate above, the margins short woolly, the upper and lower surfaces short woolly to glabrous. FLOWERS: relatively large, the corolla lobes 4-6 mm long, the column 0.6-0.8 mm high, the anther wings 1.3-1.7 mm long; hoods with the marginal lobes indistinct to moderately developed, the horns subdigitate. NOTES: Known in AZ from two collections: Red Mesa, Apache Co. and s of Navajo Bridge, Coconino Co.; desert scrub and pinyon-juniper communities; 1100-1900 m (3600-6300 ft); Apr-Jun; nw NM, se UT. REFERENCES: Sundell, Eric. 1994. Asclepiadaceae. J. Ariz. – Nev. Acad. Sci. Volume 27, 169-187.