4. Helicteres lanceolata Candolle, Prodr. 1: 476. 1824.
剑叶山芝麻 jian ye shan zhi ma
Shrubs, 1-2 m tall. Branchlets densely yellow-brown stellate puberulent. Petiole 3-9 mm; leaf blade lanceolate or oblong-lanceolate, 3.5-7.5 × 2-3 cm, both surfaces yellow-brown stellate puberulent, denser abaxially, base obtuse, margin entire or sparsely dentate toward apex, apex acute or acuminate. Inflorescence with flowers fascicled or in 1-2 cm cyme, axillary. Flowers small, ca. 12 mm. Calyx tube-shaped, 5-lobed, hairy. Petals 5, purple, unequal in length, claw and central part of limb hairy. Androgynophore tomentose at base. Staminodes linear-lanceolate. Ovary pilose; ovules ca. 12 per locule. Capsule cylindric, 2-2.5 × ca. 0.8 cm, apex beaked, densely villous. Fl. Jul-Nov.
Scrub, grasslands. C Guangdong, SE Guangxi, SE Yunnan (Zhenyuan) [Cambodia, Indonesia, Laos, Myanmar, Thailand, Vietnam].