Perennial, glabrous to pubescent herb. Stems herbaceous, erect or scrambling, branching, more or less woody below. Leaves 3-7 x 1-4 cm., petiolate, broadly ovate to ovate-lanceolate, rounded, cuneate, truncate or subcordate at base, obtuse to acute at apex, entire to deeply sinuate. Panicles usually terminal, leafy, loose, compound of 1-2 whorls or umbels borne on axillary rather long peduncles. Bracts small, soon deciduous, puberulent. Pedicels as long as or shorter than flowers. Flowers up to 10 in each umbel, 1-1.5 cm. Perianth funnel-shaped, white or lilac above, tubular and greenish below, short-pubescent; limb 4-5 mm. broad. Stamens 3, long-exserted. Fruit up to 9 mm., somewhat ribbed, with stalked or sessile tubercles at apex. Fl. December-June.