Plant herbaceous or suffrutescent; leaves of a pair (especially the petioles) somewhat unequal, the blades thin, elliptic or ovate-lanceolate, 2-8 cm. long, 1-3 cm. wide, rarely longer, acuminate at apex, rounded or subacute, sometimes sub-auriculate at base, 3-nerved, entire, usually ciliate, glabrous or sparingly strigillose with pellucid hairs, usually punctate beneath, the cystoliths linear or fusiform, usually inconspicuous; plants monoecious, the panicles 1 or 2 to an axil, shorter than the leaves, pedunculate, androgynous, or the upper almost wholly staminate and the lower pistillate; achenes minute, barely 0.5 mm. long.
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