直唇姜 zhi chun jiang

Pseudostems 50--70 cm. Leaves 4 or 5; ligule 2-lobed, 4--6 mm; petiole 4--8 cm; leaf blade ovate-lanceolate or oblong, 15--25 × 3.5--6 cm, abaxially pubescent, base cordate with basal lobes separate, apex acuminate. Spikes 8--12 cm; bracts lanceolate, 1.5--2.5 cm. Flowers yellow. Calyx subclavate, ca. 1.5 cm, split nearly to base on 1 side, apex 2-toothed. Corolla tube 2--2.5 cm; lobes lanceolate, 1--1.3 cm. Labellum embracing filament, cuneate, ca. 1.5 cm, apex 2-cleft. Filament narrowly linear, flexuous, 3.5--4 cm; anther 7--8 mm; connective appendage absent. Fl. Aug. 2 n = 22*.

Calcareous rocks; ca. 1000 m. S Yunnan (Xishuangbanna Dai Zu Zizhizhou) [Myanmar, Thailand].