Plant: perennial herb; 3-8 dm tall, foliage glabrous or sparsely pubescent Leaves: lanceolate to linear, the lower ones 3-9 cm long, 4-18 mm broad, the upper ones 3-7 cm long, 2-5 mm broad Inflorescence: a terminal, compound cyme Flowers: calyx lobes subulate, glabrous, ciliate along the margins, or densely pubescent, 2-7 mm long; corolla tube 8-15(-17) mm long, broadest below the apex, moderately constricted at the orifice, the lobes (2-)4-7 mm long Fruit: terete, 2-13 cm long. SEEDS cylindrical, corky, 6-10 mm long, 1.0-2.5 mm broad Misc: Mostly along watercourses in desert grasslands and mesquite scrublands; 750-1500 m (2500-5000 ft); Mar-May REFERENCES: McLaughlin, Steven, P. 1994. Apocynaceae. J. Ariz. – Nev. Acad. Sci. Volume 27, 164-168.