Plateau Rocktrumpet

Macrosiphonia lanuginosa (Mart. & Gal.) Hemsl. Biol
Centr. Am. Bot. 2: 316. 1881.
F
EchUes lanuginosa Mart. & Gal. Bull. Acad. Brux. XV: 357. 1844. Rhodocalyx lanuginosus Miers, Apoc. S. Am. 139. 1878.
Erect or somewhat diffuse suffrutescent herb, 1-3 dm. tall; leaves subsessile, broadly oblong to ovate-elliptic, 1.5-4 cm. long, 0.5-2 cm. broad, acute to obtuse at the apex, truncate, rounded, or broadly obtuse at the base, dark-green and finely hirtellous above, much paler and densely tomentulose beneath; inflorescence bearing 1-3 rather showy, white, vespertine flowers, the peduncle obsolete or scarcely manifest; pedicels 5-10 mm. long; calyx-lobes oblong-lanceolate, acuminate, 5-8 mm. long, somewhat petaloid; corolla infundibuliform, densely puberulent-papillate externally, the tube proper 30-60 mm. long, about 1.5 mm. in diameter at the base, the throat narrowly conic or subtubiilar, 10-20 mm. long, 5-7 mm. in diameter at the orifice, the lobes obliquely obovate, 15-20 mm. long, spreading; follicles relatively stout, more or less articulate, 10-15 cm. long, irregularly puberulent to glabrate.
Type locawty: Mextitlan, Hidalgo.
Distribution: Diirango to San Cuis Potosi and Tamaulipas, and southward to Hidalgo and Puebla; (?) Oaxaca.