Herbs. Stems ca. 1 m tall, subglabrous or retrorse minutely tomentose. Petiole to 8 cm; leaf blade triangular-ovate to ovate-oblong, 6.5-14 × 4-8 cm, adaxially sparsely hirtellous, puberulent on veins, abaxially glabrous, base subtruncate to abruptly attenuate, margin coarsely crenate-serrate, apex long acuminate. Cymes dichotomous, axillary or 6-10 in terminal panicles ca. 2 cm in diam.; peduncle 1.4-3 cm; bracts 1-3 × 0.8-1.6 cm, margin serrate or subentire. Calyx ca. 8 × 3.5 mm, ± membranous, glabrous, margin ciliolate; teeth subequal, triangular-subulate, ca. 3 mm; fruiting calyx dilated, scarious, distictly transverse veined, teeth hooded at apex. Corolla yellowish, ca. 2.8 cm, finely puberulent, throat ca. 6 mm wide; upper lip ca. 7 mm, apex emarginate; lower lip slightly shorter, subcircular; middle lobe circular, ca. 2 mm in diam.; lateral lobes triangular-ovate, ca. 1.5 × 2 mm. Nutlets dark brown, obovoid-oblong, 1.8 × 1 mm, base acute, glabrous. Fl. Jul-Aug, fr. Sep.
Home