Procumbent annual. Stems moderately to densely hairy, branched, up to 40 cm long. Lvs opposite, glabrous to sparsely hairy above, sparsely to moderately hairy below, shortly petiolate, finely serrate toward apex, usually oblong, acute or obtuse, asymmetric at base, (3)-5-10-(12) mm long, often with a purple spot about midvein; stipules lanceolate, entire, free, c. 1 mm long. Cyathia in small, axillary, leafy clusters along branches; subtending lvs like stem lvs. Glands ovate, with small white or purplish appendages. Capsules smooth, grooved, sparsely to moderately clothed in appressed hairs; keels sharp. Seeds rugulose, 4-angled, reddish brown, 0.7-1.0 mm long.