Erect sparingly branched annual of 1 1/2–3 ft.; stem terete, striate, thinly setulose pubescent or glabrate, leafy to the top. Leaves ovate or lanceolate, acute, apiculate; upper sessile, ovate-lanceolate, base cordate and amplexicaul, lower narrowed below the middle or suddenly contracted into a winged auricled and clasping petiole, membranous, serrate-dentate, with mucronate teeth, scabrid or subglabrate, 1–4 in. long, 1/2–1 1/2 in. broad. Capitula at length hemispherical, 1/4– 1/3 in. broad, in small dense rounded pedunculate or subsessile cymes, 1–2 in. diam. Scales of involucre pauciseriate, linear-lanceolate, acute, 1-nerved, green, pilose, with scarious margins. Receptacle convex, constricted at base, foveolate towards the centre, with toothed margins to the pits. Ligule obsolete. Anther-base obtuse. Achenes thinly very minutely appressed-pubescent. Pappus connate at base in minute ring.
