LEAVES: lanceolate to mostly narrowly lanceolate or linear, more than 3-4 times as long as broad, sagittate to hastate, truncate or rarely obtuse at the base, the petioles mostly to 1 cm long; flowers purplish; follicles 7-10(-12) cm long. NOTES: See also parent taxon. Desert washes and slopes, canyons, floodplains, disturbed sites: nearly throughout the state, unrecorded only from Apache and Greenlee cos.; 150-1700(-2050) m (500-5500(-6800) ft); Mar-Dec; s CA and s UT to s NM, sw TX; s in Mex. to Baja C. Sur, Jal. and Qro. REFERENCES: Sundell, Eric. 1994. Asclepiadaceae. J. Ariz. – Nev. Acad. Sci. Volume 27, 169-187.