Annual, with prostrate or decumbent simple or branching stems 1 1/2–10 in. long radiating from the crown of the root, minutely puberulous or subtomentose all round at the tips. Leaves opposite, shortly petiolate, 1/4– 1/2 in. long, 3/4–2 lin. broad, oblong, very obtusely rounded at the apex, oblique and rounded at the base, entire, glabrous above, thinly pubescent with minute curved hairs beneath. Stipules all free, subulate. Flowering-branchlets axillary, shorter than the leaves, with 2–5 involucres clustered among the reduced leaves or bracts. Involucres about 2/3 lin. in diam., very shortly pedunculate, obconic-campanulate, pubescent or subtomentose, with 4 glands and 5 minute lobes; glands minute, transverse, with small but distinct petaloid appendages. Capsule nearly 1 lin. in diam., somewhat acutely 3-angled, densely white-puberulous; styles very minute, about 1/8 lin. long, bifid. Seeds 1/2 lin. long, 4-angled, with 2–3 slight transverse ridges on the faces, greyish.