Stenocephalum jucundum (Gleason) H. Rob.

Vernonia jucunda Gleason, Bull. Torrey Club 46: 248. 1919
Stems herbaceous, erect, 4 dm. high or more, sparingly branched, densely villous when young, becoming floccose when older and eventually glabrate; leaf-blades firm, ovate-oblong, 6-8 cm. long, 3-4 cm. wide, acute or short-acuminate into a subulate tip, undulate and irregular at the entire margin, or rarely serrate, frequently somewhat revolute, narrowed to a sessile base, dark-green, rugose, and scabrous with papillose hairs or hair-bases above, closely grayor white-tomentose beneath; upper and braeteal leaves similar but smaller; heads 5-flowered, standing opposite and a little below each braeteal leaf which later bears a secondary head in its axil; involucre 8-10 mm. high, cylindric or narrowly campanulate, scales stiff, imbricate and appressed at base, papillose-villous, lanceolate-oblong to ovateoblong, long-acuminate into a squarrose, subulate, glabrous, terete, callous tip; achene pubescent on the ridges, 2.5 mm. long; pappus pale tawny, the bristles 5 mm. long, the scales trough-shaped, 1-1.1 mm. long.
Type locality: Sierra de Tonala. Chiapas. Distribution; Chiapas.