Liabum bourgeaui Hieron.

Liabum bourgeaui Hieron. ; Ule, Verh. Bot. Ver. Prov Brand. 48: 208. 1907.
Allendea lanceolata Llave; Llave & Lex. Nov. Veg. Descr. 1: 10. 1824. Not Liabum lanceolatum
Schultz-Bip. 1853. Liabum asclepiadeum Seem. Bot. Voy. Herald 141. 1854. Not L. asclepiadeum Schultz-Bip. 1847.
A perennial herb; stem leafy, 5-10 dm. high or more, white-tomentose; petioles 2-5 cm. long, broadly winged, amplexicaul-clasping around the stem ; leaf-blades ovate or oval, 8-20 cm. long, 4-13 cm. wide, acuminate at the apex, decurrent at the base, denticulate, floccose but soon glabrate, smooth, and green above, white-tomentose beneath, 5-ribbed, the second pair of ribs the stronger and extending to near the apex of the leaf; inflorescence cymose-paniculate, leafy below, the ultimate peduncles very short; involucre 8-9 mm. high, about 1 cm. broad; bracts imbricate in 6 or 7 series, puberulent and slightly floccose, narrowly lanceolate, the outer acute and successively shorter, the inner attenuate; tube of ray-corollas 5 mm. long, the ligule 2.5-3 mm. long, less than 0.5 mm. wide; disk-corollas 6 mm. long, the tube slender, 3 mm. long, the throat narrowly funnelform, the lobes linear-lanceolate, 2 mm. long; style-branches 1.5 mm. long; aehenes slightly more than 1 mm. long, hispid; inner pappus-bristles about 20, about 5 mm. long, scabrous, the outer few and minute.
Type locality : Valley of Cordoba, Mexico. Distribution: Southern Mexico to Panama.