Description from Flora of China
Lysimachia saurauifolia S. S. Ying; Rhynchotechum ellipticum (Wallich ex D. Dietrich) A. de Candolle var. saurauifolium (S. S. Ying) S. S. Ying.
Stems 0.3-2 m, apically densely appressed, rust-brown woolly. Leaves opposite; petiole 0.5-2.5 cm, densely appressed, rust-brown woolly; leaf blade usually elliptic to obovate, rarely ovate, (6.5-)13-30 X (2.5-)6.5-12 cm, densely rust-brown woolly, glabrescent, abaxially veins remaining densely woolly, base cuneate to attenuate, rarely rounded, margin denticulate to serrate, apex abruptly acuminate to acute. Cymes 5-30-flowered; peduncle 1.2-3(-5.7) cm, rust-brown villous; bracts 3-8 mm. Pedicel 3-9(-22) mm. Calyx segments lanceolate, 2-5 mm, outside rust-brown villous, inside glabrous. Corolla white to red or purple, 4-5 mm; tube ca. 2 mm; adaxial lip ca. 1 mm; abaxial lip ca. 2 mm. Stamens adnate to corolla base, ca. 1.4 mm; staminode ca. 0.2 mm. Pistil ca. 4 mm, puberulent at least sparsely near style base; ovary ca. 1 mm. Berry white to greenish, 3-4 mm, puberulent, at least sparsely. Fl. May-Sep, Jan, fr. Jul-Mar.
Cyrtandra hillii CyrtandrahilliiH. Léveillé (1911) is probably conspecific with Rhynchotechum formosanum, but the combination in Rhynchotechum has never been made.
Dense forests, shaded streamsides, rocky areas in valleys; 200-1500 m. S Guangdong, SW Guangxi, S Guizhou, Hainan, Taiwan, SE Yunnan [N Thailand].