Stem woody, unbranched, 10–20 ft., leafy, terete, striate, closely tawny-tomentose above. Leaves very large, alternate, membranous, tomentose and paler beneath, dark glabrate and obsolete-scabrid above; upper obovate-elliptical, broadly pointed, base narrowed into the short amplexicaul petiole, broadly toothed and denticulate, 1 3/4–2 1/2 ft. long, 7–12 in. broad. Capitula many-flowered (yellowish, Barter), 1 1/4–1 3/4 in. broad, sessile on the ascending branches of an ample terminal pyramidal panicle, 1–3 ft. long; bracts 1 in. more or less, lanceolate, tomentose. Involucre campanulate; scales multiseriate, appressed, acute, more or less tomentose, outer ovate, inner much longer, linear, caducous. Receptacle areolate, glabrous. Achenes glabrous, unequally (9-) 10-costate. Pappus white, pilose; setæ subequal, at length widely spreading.
