3. Torenia flava Buchanan-Hamilton ex Bentham, Scroph. Ind. 38. 1835.
黄花蝴蝶草 huang hua hu die cao
Torenia hokutensis Hayata.
Herbs, erect, 25-40 cm tall, usually branched from base, villous. Petiole ca. 5.8 mm; leaf blade ovate to elliptic, 3-5 X 1-2 cm, abaxially glabrous except for veins, adaxially pilose, base cuneate and tapering, margin crenate. Racemes terminal, 10-20 cm; bracts oblong-ovate, 5-8 mm, villous, margin ciliate, apex acuminate. Pedicel ca. 5 mm, usually shorter than calyx. Calyx narrowly cylindric, straight to slightly curved, 5-10 X 2-3 mm, 10-15 X 3-5 mm in fruit, villous, 5-ribbed; veins ciliate; lobes 5, narrowly lanceolate, nearly as long as calyx tube in fruit. Corolla yellow; tube 1-1.2 cm; lower lip lobes suborbicular, subequal; upper lip lobes slightly larger than lower lobes, margin entire or emarginate. Anterior stamens appendages ca. 1 mm. Capsule narrowly ellipsoid. Fl. and fr. Jun-Nov.
Dry meadows, forest margins; below 1000 m. Guangdong, Guangxi, Hainan, Taiwan, S Yunnan [Cambodia, India, Indonesia, Laos, Malaysia, Myanmar, Thailand, Vietnam].