Herbs or subshrubs, erect to perhaps clambering, to 60 cm tall; stems 4-angled, flattened, or terete, sometimes sulcate, glabrous. Leaves petiolate; petiole 3-6 mm, glabrous; blade drying papery or membranous, ovate, lanceolate, ovate-lanceolate, or elliptic, 3.2-12 × 1.2-4.5 cm, glabrous, base cuneate, obtuse, or rounded then often decurrent, apex acute or acuminate; secondary veins 4-6 pairs but usually not visible; stipules shortly fused to petiole bases or around stem, broadly triangular, 2-4 mm, glabrous or pilosulous to hirtellous, acute or usually acuminate to aristate, entire or glandular-serrulate. Inflorescence axillary and/or terminal, capitate or glomerulate, 5-10 mm in diam., 10-18-flowered, glabrous, sessile or subsessile; bracts lanceolate, triangular, or linear, 0.5-4 mm. Flowers sessile to subsessile, floral biology unknown. Calyx glabrous; hypanthium portion obconic to campanulate, 0.8-1 mm; limb lobed essentially to base; lobes triangular, 1-1.2 mm. Corolla white to violet, funnelform; tube 2-3 mm; lobes lanceolate, 1-1.2 mm. Fruit indehiscent or tardily septicidal, ellipsoid-oblong to subglobose, 2-4 × 1.5-3 mm, with pedicels to 2 mm; seeds 10-12, black, foveolate. Fl. Apr-Jun.
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