Annual; stems densely hairy, procumbent to erect, not rooting at nodes. Lvs moderately to densely hairy; petioles 2-15-(25) mm long; leaflets obovate, acute to obtuse, mucronate, cuneate at base, finely serrate, c. 4-12 mm long; lateral veins distinctly recurved and thickened toward leaflet margin; petiolules < 1 mm long; ± equal; stipules ovate, acuminate. Infls axillary and terminal, spicate, ovoid or globose, sessile, mostly somewhat < subtending lf; fls numerous, sessile or subsessile; bracts 0 but stipule of subtending lf partly enfolding young infls. Calyx moderately hairy, with 10 distinct veins, not inflated at fruiting; throat open, somewhat thickened, moderately hairy; calyx teeth somewhat unequal, narrowly triangular, spreading at fruiting; lower teeth slightly corolla, slightly > tube; sinuses acute. Corolla white, persistent, 4-5 mm long. Pod glabrous, straight, < calyx, c. 1.5 mm long, 1-seeded; seeds c. 1-1.5 mm diam.
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