Montanoa standleyi  

Shrubs 4 m tall. Stems terete, light brown, glabrous. Leaves scarcely variable; petioles 1.5-7.0 cm long, puberulent; blades ovate-lanceolate to pentagonal (Fig. 38A), 7-12 cm long, 3.5-10.0 cm wide, apex acuminate, margin serrate, adaxial surface sparsely pubescent, hairs pustular, abaxial surface glabrous. Peduncles 1.0-3.5 cm long, moderately puberulent. Heads erect, 1.0 cm diam in flower, 1.5 cm diam in fruit, several to many in cymose synflorescences in oppositely or alternately branched compound corymbs. Phyllaries 5, uniseriate, equal, lanceolate, 5-6 mm long, 1.0-1.5 mm wide, green, apex acuminate, mucronate, margin glabrous, entire, abaxial surface nearly glabrous, adaxial surface glabrous. Ray florets (Fig. 38B) 5-10; corollas white, ligules obovate, 18-22 mm long, 6-8 mm wide, apex acute, adaxial surface glabrous, abaxial surface sparsely glandular and pubescent, hairs less than 0.5 mm long, tube almost non-existent and glabrous. Disc florets (Fig. 38C) 35-50; corollas yellow, tube 1.0 mm long, 0.5 mm diam, essentially glabrous, throat cylindrical, 3.0-3.5 mm long, 1.5 mm diam, glabrous, lobes 5, 1.0-1.5 mm long, 0.5 mm wide, apex acuminate, glabrous; stamens with filaments 2.7-3.0 mm long, 0.2 mm wide, anthers (Fig. 38D) not fully exserted from corolla, thecae yellow or brown, 2.0 mm long, 0.5 mm wide, apex of connective yellow, acuminate, 1.0 mm long, 0.4 mm wide, glabrous; styles (Fig. 38E) yellow, 6.25-6.75 mm long, enlarged at base, stigmatic surfaces yellow or brown, 1.0 mm long, apical appendages acuminate, yellow, 0.75 mm long, 0.25 mm wide. Pales at anthesis ovate-triangular with slight keel on abaxial surface of the midrib (Fig. 38F), 3.5-4.0 mm long, 2.0 mm wide, light yellow with dark green bands on veins, apex long-acuminate, dark, indurate, margin ciliate, entire, adaxial and abaxial surfaces glabrous; pales at fruiting persistent, triangular (Fig. 38G, H) with slight keel on abaxial surface of midrib, 8 mm long, 1.5 mm wide, indurate with prominent parallel veins, stramineous, apex long-acuminate, recurved, margin essentially glabrous, entire, adaxial and abaxial surfaces glabrous. Achenes brown-black, prominently 4-edged (Fig. 38I), 2.25 mm long, 1.25 mm wide, smooth. Chromosome number unknown.

Funk, V. A. "The Systematics of Montanoa (Asteraceae, Heliantheae)" in Memoirs of the New York Botanical Garden. Vol. 36. The New York Botanical Garden. Bronx, NY. 1982.