Leaf blades round, ovate, elliptic, or reniform, margins entire or crenulate. Proximal inflorescence bracts usually as long as or longer than subtended pedicels, sometimes shorter than subtended pedicels. Flowers: calyx lobes 1.4-3.5(-4.3) mm, apices acute to acuminate; anthers (1.7-)2-3.4 mm. 2n = 46.