长节润肺草 chang jie run fei cao

Herbs to 50 cm tall. Root tuber globose, to 2 cm in diam. Stems erect, simple, internodes long, glabrous. Leaves opposite, sessile; leaf blade linear, 5-6.5 × ca. 1.1 cm, glabrous; midvein concave adaxially, convex abaxially, lateral veins obsolete. Inflorescences terminal, umbellate, few flowered; peduncle ca. 1 cm. Pedicel 7-8 mm, puberulent. Sepals lanceolate, ca. 1.5 mm, puberulent to glabrous. Corolla subrotate; tube short; lobes triangular-ovate, ca. 5 × 1.5 mm, pilose. Corona lobes 3-cleft, reflexed. Pollinia ovoid, erect.

Lower forests. S Guangxi [Thailand, Vietnam].