• Scientific Name: Schnabelia oligophylla Hand.-Mazz.
• Ref: Anz. Akad. Wiss. Wien, Math.-Naturwiss. Kl. 58: 93. 1921.
• Chinese Common Name: 四棱草 si leng cao
• Family: Verbenaceae
• Genus: Schnabelia
• Distribution: 600-1900 m. Fujian, Guangdong, Guangxi, Hainan, Hunan, Jiangxi, Sichuan, NE Yunnan, Zhejiang
• Type: Prov. Hunan: In fruticetis ad flumen Tsi-djiang prope vicum Lengschuidjiang supra urbem Hsinhwa, substr. calceo, ca. 200 m, legi 29. V. 1918 (It. Sin., Nr. 11.967) et infra pagum Ludtidsai (Laodao) inter Hsinhwa et Wukang.

 Herbs 60-100(-120) cm tall, erect to climbing. Stems minutely puberulent, soon glabrous; internodes 0.5-8(-12) cm. Petiole 0.3-2.3 cm; leaf blade oblong, triangular-ovate, or ovate, sometimes deeply 3-lobed, 1-5 X 0.8-2 cm, papery, base cuneate, subrounded, or subcordate, margin serrate, apex short acuminate to acute. Cyme usually 1-flowered; bracts awl-shaped. Open flowers: Calyx 10-veined; teeth 5, 5-8 X 1 mm, margin entire, ciliate, apex acuminate. Corolla bluish purple to purple, 1.4-1.8 cm, tube ca. 12 X 2 mm; lower lip wedge-shaped to obovate-triangular, middle lobe 8-5.5 mm, lateral lobes 3-5 mm; upper lip broadly elliptic, ca. 4 X 3 mm. Cleistogamous flowers: Calyx ca. 3 mm. Corolla ca. 1.5 mm, lower lip with middle lobe ca. 0.5 mm and lateral lobes ca. 0.2 mm; upper lip ovate to subrounded, ca. 0.2 mm. Nutlets ca. 5 X 2.8 mm.(Flora of China)