Mandevilla brachysiphon (Torr.) Pichon

Macrosiphonia brachysiphon (Torr.) A. Gray, Syn
Fl. N. Am. 21: 83. 1878.
Eckites brachysiphon Tor. Bot. Mex. Bound. Siurv. 159. 1859.
Erect or diffuse suffrutescent herb, 1-3 dm. tall; leaves ovate to ovate-elliptic, 15-30 mm. long, 7-15 mm. broad, acute at the apex, abruptly rounded to obtuse at the base, minutely puberulent to glabrate on both sides, the petioles 1-2 mm. long; inflorescence bearing 1-3 conspicuous white vespertine flowers, the peduncle obsolete or scarcely manifest; pedicels 5-12 mm. long; caly^c-lobes narrowly oblong, acute to acuminate, 5-7 mm. long, 2-3 mm. broad, somewhat petaloid, minutely puberulent to glabrate; corolla infundibuliform, densely and minutely puberulent-papillate externally, the tube proper 10-15 mm. long, about 1.5 mm. in diameter at the base, the throat narrowly conic or subtubular-conic, 10-12.5 mm. long, about 4 mm. in diameter at the orifice, the lobes obliquely obovate, 7-13 mm. long, widely spreading; follicles slender, continuous or slightly articulate, 8-10 cm. long, minutely puberulent-papillate.
Type locaIvITy: Arroyo de los Janos, Sonera. Distribution: New Mexico, Arizona, and Sonora.