五指山蓝 wu zhi shan lan

Justicia lanceolaria Roxburgh, Fl. Ind. 1: 122. 1820.

Herbs to 1 m tall, erect. Branches stout, densely covered with white retrorse trichomes or sometimes glabrescent. Petiole (0.5-)1.5-3.5 cm; leaf blade lanceolate to ovate-lanceolate, (6-)10-17 × (1-)3-6 cm, abaxially sparsely pubescent or glabrescent, adaxially glabrescent except for a few trichomes along midvein toward base, secondary veins 5-7 on each side of midvein, base narrowly cuneate and slightly oblique, margin entire, apex acuminate. Inflorescences of axillary pedunculate cymes of (1-)3 involucres with cymes sometimes in axils of distal bracts and collectively forming a terminal panicle-like complex 5-7 cm; outer involucral bracteoles linear-lanceolate, 10-18 × 1.5-3 mm, gland-tipped pubescent; inner involucral bracteoles similar to outer ones except smaller. Calyx ca. 9 mm; lobes linear, ca. 1 mm broad. Corolla pink, ca. 4.5 cm, outside pubes- cent with gland-tipped and non-glandular trichomes; tube base ca. 1.5 mm wide for ca. 2.5 cm; lip in lower position obovate, ca. 2 × 0.8 cm, slightly 2-lobed; lip in upper position oblong, ca. 2 × 0.6 cm, 3-lobed, lobes ovate and ca. 1 × 1 mm. Staminal filaments ca. 1.8 cm, glabrous; anther thecae oblong, ca. 3 × 0.6 mm, superposed. Capsule 1.4-1.8 cm, pubescent with gland-tipped trichomes. Seeds ca. 3 × 2 mm, smooth. Fl. Dec-Mar, fr. Mar-Jun.

Wet places; 500-700 m. Hainan, Yunnan [India, Laos, Myanmar, Thailand, Vietnam].