Sinclairia caducifolia (B. L. Rob. & Bartlett) Rydb.

Sinclairia caducifolia (Rob. & Bartl.) Rydberg
Liabum caducilolium Rob. & Bartl. Proc. Am. Acad. 43: 59. 1907.
A shrub, with gray glabrous branches; petioles about 2 cm. long; leaf-blades rhombiclanceolate, denticulate, short-acuminate, cuneate and slightly decurrent at the base, 3-6 cm. long, 2-3 cm. wide, glabrous above, white-tomentose beneath ; inflorescence cymose-paniculate, leafy; branches slender, spreading or arcuate-ascending; heads discoid, about 6-flowered; involucre 6 mm. high and 6-8 mm. broad; bracts in 4 series, striate, the outer ovate, acute, the inner linear-oblong, rounded or very obtuse at the apex; corolla about 6.5 mm. long, the tube gradually widening into the throat, the lobes 1.5 mm. long; achenes 3 mm. long, 10-ribbed, hispid; pappus-bristles about 40, scabrous, 7 mm. long, the outer squamellae scarcely 1 mm. long.
Type locality: Acapulco, Guerrero. Mexico. Distribution: Guerrero and Colima.