Herbs, stout or slender, short-lived perennial or annual. Stems 0.2-1.8 m. Leaves: 2-3 pairs near base; petiole 2-7 cm; blade broadly ovate to almost round, 2-11 × 2-13 cm, base shallowly cordate to ± truncate, apex rounded or obtuse, adaxial surface yellow-green, abaxial surface much paler, both surfaces sparsely villous-hispid with blackish based hairs. Flowers usually borne singly on branchlets of inflorescence; perianth 8-9 mm, tube white to pink or pale lavender [magenta], finely pubescent, limbs white to pink or pale lavender [magenta], gradually flared from tube; stamens 5, exserted 4-6 mm. Fruits bluntly 5-angled, turbinate, 2.6-3.8 × 2.4-3.4 mm, sometimes secreting mucilage (especially southern populations) when wetted; ribs 10, faint, linear; equatorial flange or ridge absent. 2n = 24.
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