Glabrous perennial 2–8 dm, simple below the infl or few-branched at base; lvs mostly 25–50 below the infl, narrowly elliptic to oblanceolate, 1–2.5 cm × 1.5–5 mm, opposite below, usually alternate above; infl of slender, rather stiffly ascending-spreading branches; pedicels 1–4 mm; sep lanceolate, acute, 2–3 mm, the inner usually (and the outer seldom) sparsely glandular-toothed; pet yellow, 4–7 mm; fr turbinate, ± pointed, 2–3 mm, readily dehiscing into 10 sharp-pointed mericarps; exposed portion of the fr anthocyanic; false septa evidently incomplete, glabrous; septa sparsely but evidently ciliate; 2n=36. Open oak or pine woods and open places on the coastal plain from e. Mass. to N.C., thence inland to Tenn. and Ala.; isolated in nw. Ind. June, July. (Cathartolinum i.)