Sinclairia pringlei (B. L. Rob. & Greenm.) H. Robins. & Brettell

Megaliabum pringlei (Rob. & Greenm.) Rydberg
Liabum Pringlei Rob. & Greenm. Proc. Am. Acad. 32: 49. 1896.
Plant 1-1.5 m. high; stem terete, sulcate, tomentulose and viscid-hirsutulous, shrubby at the base; petioles 5 mm. long or less; leaf-blades ovate, acute at the apex, rounded to acute at the base, mucronate-dentate or -denticulate, 5-10 cm. long, green and scabrous-hispidulous above, white-tomentose and on the veins glandular-hirsute beneath, triple-ribbed; heads few, large, cymose-paniculate, discoid; involucre hemispheric, nearly 2 cm. high, 2.5-3 cm. broad; bracts numerous in 5 or 6 series, regularly imbricate, the outer gradually shorter, ovate, the innermost linear-lanceolate, all acute or the inner attenuate, glandular-hirsute; flowers about 75; corolla yellow, about 15 mm. long, the tube gradually expanding into a cylindric throat, the lobes linear-lanceolate, erect; achenes 5 mm. long, hirsute; pappus-bristles 10-12 mm. long, straw-colored, scabrous-hispidulous, the outer squamellae lanceolate, 0.5-1 mm. long.
Type locality: Lake Chapala, Jalisco. Distribution: Known only from the type locality.