Plant: Perennial herb; stems erect to spreading, sparingly branched from near the base, 10-40(-60) cm tall, pubescent more or less in lines above the petioles Leaves: opposite, the petioles 1-3 cm long, the blades ovate to broadly lanceolate, 3-14 cm long, 2-7 cm broad, the bases broadly obtuse to rounded or truncate, more or less abruptly narrowed to the petiole, obtuse to acute at the apex, pubescent with more or less spreading hairs on both surfaces or infrequently glabrate INFLORESCENCE: UMBELS 1 to many, lateral, 5-8 cm broad, sessile or the peduncles to 2 cm long Flowers: large; calyx lobes 3.5-6 mm long; corolla purplish-green, the lobes 12-16 mm long; hoods yellowish to orangish, erect, oblong from a rounded base, more or less dilated above to an oblique or truncate apex, 8-11 mm long, 2-3 mm broad at the top, 4-7 mm longer than the gynostegium, the horns radially flat, attached in the upper half of the hoods, triangular, with a sharp, tooth-like projection exserted ca. 1 mm; anther wings 1.2-1.6 mm long; corpusculum 0.3 mm long, the pollinia 1.2-1.5 mm long Fruit: FOLLICLES erect on deflexed pedicels, 5-9 cm long Misc: Washes, slopes, roadsides of deserts, grasslands, and open woodlands; 500-2000 m (1600-6500 ft); Apr-Oct REFERENCES: Sundell, Eric. 1994. Asclepiadaceae. J. Ariz. – Nev. Acad. Sci. Volume 27, 169-187.