Annual, erect, 3–12 in. high, with the main branches alternate or opposite, ascending-spreading, dichotomously branched, terete, glabrous in all parts. Leaves opposite on all the flowering parts, alternate on some of the lower parts of the stem and branches, sessile, 1/3–2 in. long, 3/4–3 lin. broad, linear or linear-lanceolate, acute or obtuse, rounded in at the base, apparently somewhat glaucous. Stipules none. Involucres solitary at the forks or ends of the branches, subsessile or shortly pedunculate, 3/4–1 lin. in diam., cup-shaped, with 4 glands and 5 ovate-oblong or subquadrate fringed lobes, glabrous outside; glands about 1/3– 2/3 lin. in their greater diam., transverse, narrowly oblong or half-moon-shaped, 2-horned. Capsule about 1 1/2 lin. in diam., exserted on a recurved pedicel twice as long as the involucre, glabrous; styles 1/3– 2/5 lin. long, free to the base, deeply bifid, erect, with recurved tips. Seeds 1–1 1/4 lin. long, ellipsoid or ovoid, obtuse, white-rugose with a few smooth dark brown or dull green markings and with a peltate caruncle.
