Montanoa leucantha  

Shrubs 1-7 m tall. Stems terete, brown to gray, herbaceous parts puberulent to glabrous. Leaves extremely variable; petioles 1.5-12.0 cm long, sometimes partially winged, with or without auricles, puberulent to densely pubescent, hairs 1.25 mm long; blades ovate-lanceolate, triangular, rhombic or pentagonal, 2.5-24.0 cm long, 2-24 cm wide, apex acute to long-acuminate, margin entire to serrate-dentate, sometimes 3-5-lobed, adaxial surface moderately pubescent, hairs pustular, sometimes with numerous small hairs covering surface, abaxial surface moderately to densely glandular and pubescent, hairs 0.5-1.0 mm long. Peduncles 1-4 cm long, sometimes tinged with purple, moderately to densely glandular and pubescent, hairs 0.5-1.0 mm long. Heads pendulous at fruiting, 0.8-1.2 cm diam in flower, 1.8-3.0 cm diam in fruit, many to extremely numerous in cymose synflorescences in oppositely branched compound corymbs with hemispherical appearance. Phyllaries 5-7(-9), more or less uniseriate, reflexed at anthesis, subequal, lanceolate to ovate-lanceolate, 4-6 mm long, 1-2 mm wide, brown to green or green and purple, apex acute, mucronate, margin entire, ciliate, abaxial surface densely glandular and pubescent, hairs 0.5-1.0 mm long, adaxial surface moderately glandular and pubescent on distal half, hairs 0.5-1.0 mm long. Ray florets usually 8; corollas white, ligules elliptic to obovate, 13-18 mm long, 5-8 mm wide, apex acute to 2-notched, with clusters of round-tipped hairs, adaxial surface glabrous to sparsely pubescent, hairs 0.5-1.0 mm long, abaxial surface sparsely to moderately glandular, tube 1.0 mm long, 0.5 mm wide, glabrous. Disc florets 30-60; corollas yellow, tube 1.0-1.25 mm long, 0.5-0.75mm diam, glabrous, throat cylindrical, 2.0-2.25 mm long, 1.0-1.75 mm diam, sparsely to densely pubescent primarily on distal half, hairs round-tipped, lobes 5, 0.5-1.0 mm long, 0.5 mm wide, apex acute, densely glandular and pubescent, hairs round-tipped; stamens with filaments 1.5-3.0 mm long, less than 0.25 mm wide, anthers not fully exserted from corolla, thecae yellow to brown, 1.25-2.0 mm long, 0.5-0.75 mm wide, apical appendages yellow, acuminate, 0.5-0.75 mm long, 0.25-0.5 mm wide, abaxial surface of apical appendage glandular; styles yellow, 4.25-6.25 mm long, enlarged at base, stigmatic surface brown, 0.75-1.25 mm long, apical appendages yellow, acuminate, 0.5 mm long, 0.25 mm wide. Pales at anthesis obtrullate to pentagonal 3.5-4.5 mm long, 2-4 mm wide, light yellow with dark bands on midrib, apex long-acuminate, indurate, curling outward prior to anthesis, margin ciliate, entire to irregular, abaxial surface densely glandular and pubescent, hairs 0.5-1.0 mm long, adaxial surface glabrous; pales at fruiting deciduous, obtrullate to obovate or almost rhombic, 8-17 mm long, 4-6 mm wide, papery with netted venation, stramineous or purple, apex acuminate, apiculate, curled outward, margin glabrous, entire, adaxial and abaxial surfaces glabrous to sub-glabrous. Achenes brown-black, 2-3 mm long, 1.25-2.0 mm wide, smooth. Chromosome number, 11 = 19.