Balbis' milkvine, more...
[Pherotrichis balbisii (Dcne.) A. Gray]
Arizona State University Herbarium
Plant: perennial herb, Densely hirsute, erect, to 50 cm tall, the long straight hairs mixed with shorter, glandular, typically dark-tipped trichomes; milky sap Leaves: ovate to orbicular below, more or less grading to lanceolate or elliptic above, the bases subcordate to rounded, 2-10 cm long; petioles 0.8-2(-4) cm long, less than one-third as long as the blades INFLORESCENCE: umbelliform, the peduncles 2-5 mm long Flowers: ca. 6 mm long; calyx lobes 3-4 mm long, 1-2 mm longer than the corolla tube; corolla whitish to yellowish-green, hirsute outside, densely matted-hirsute inside, campanulate, the tube 2-3 mm long, the lobes ovate-triangular, spreading-erect, ca. 4 mm long; crown arising from the region of union of the corolla tube and filaments, of 5 distinct, obovate-elliptic segments opposite the anthers, 1.2-2 mm long, 1-1.5 mm broad, about as long as the stigma head, broadly retuse at the apex with rounded lateral lobes, the margins more or less folded inward at the base; gynostegium subsessile, the anther head disk-shaped, the anther wings ca. 0.2 mm long; corpusculum ca. 0.25 mm long, the pollinia horizontal from the translator arms, asymmetrically obovate, 0.3-0.4 mm long; stigma head apically projected into a cylindrical protuberance ca. 1 mm long and broad Fruit: FOLLICLES pendulous on deflexed pedicels, 6-10 cm long, hirsute and glandular Misc: open woodlands, chaparral; 1050-2300 m (3500-7500 ft); Jun-Oct REFERENCES: Sundell, Eric. 1994. Asclepiadaceae. J. Ariz. – Nev. Acad. Sci. Volume 27, 169-187.