《中国植物志》|| 茜草科 RUBIACEAE ||蛇根草属 Ophiorrhiza Linn. ||长萼蛇根草 Ophiorrhiza medogensis H. Li

5. 长萼蛇根草（植物分类学报）图版27：10-13
Ophiorrhiza medogensis H. Li in Acta Phytotax. Sinica 18 (1): 116, fig. 1 (1-6). 1980; 西藏植物志4: 438, 图188 (1-6). 1985; Lo in Bull. Bot. Res. 10 (2): 18. 1990.
草本或亚灌木状，高30-60厘米，全株被多细胞长毛。枝稍粗壮，密被褐色长毛。叶具不等叶性，叶片薄纸质，披针形、长圆状披针形或近卵形，长6-14厘米，宽2.2-5.5厘米，顶端骤然渐尖，基部钝圆或近心形，两侧常不对称，边近全缘或浅波状，有缘毛，干时两面近苍白绿色或下面微红，上面无毛或散生糙毛，下面沿中脉和侧脉上密被长柔毛；侧脉每边8-16条；叶柄长0.5-1.5厘米，有时达3.5厘米，被密毛；托叶2-3全裂，裂片钻状或丝状，长达1厘米，被长缘毛。花序顶生，多花而稠密，总梗很短，长不及1厘米，和螺状分枝均被长柔毛；花无梗或有短梗；小苞片丝状或钻状，长1-2厘米，被长缘毛；萼管近球状，径约2毫米，密被长柔毛，裂片5，钻状或丝状，长7-8毫米，亦被缘毛；花冠白色，外面被疏柔毛，管状漏斗形，冠管长约1.8厘米，喉部扩大，里面中部以上被长柔毛，裂片5，长圆状卵形，长约4毫米；雄蕊5，着生在冠管近中部，花丝短，花药线形；花盘高约0.7毫米；花柱长约1.5厘米，柱头2，棒状，长约4毫米。蒴果宽约10毫米，长约5毫米。花期9月。
我国特有，产于西藏墨脱；生于海拔约1700米处的山坡阔叶林下。模式标本采自西藏墨脱得儿工。

《Flora of China》|| Rubiaceae || Ophiorrhiza ||长萼蛇根草 Ophiorrhiza medogensis

41. Ophiorrhiza medogensis H. Li, Acta Phytotax. Sin. 18: 116. 1980.

长萼蛇根草 chang e she gen cao

Herbs or subshrubs, ascending, to 60 cm tall; stems densely brown villous with multicellular trichomes. Leaves in unequal pairs; petiole 0.5-1.5(-3.5) cm, densely villous; blade drying thinly papery, pallid green on both surfaces or reddened abaxially, lanceolate, oblong-lanceolate, or subovate, 6-14 × 2.2-5.5 cm, adaxially glabrous or sparsely hispid, abaxially densely villous along principal veins, base rounded or subcordate, usually inequilateral, margins subentire or undulate, ciliate, apex abruptly acuminate; secondary veins 8-16 pairs; stipules generally persistent, with 2 or 3 subulate to filiform lobes ca. 1 cm, ciliate. Inflorescences congested-cymose, many flowered, densely villous; peduncles shorter than 1 cm; axes short, helicoid; bracts filiform or subulate, 1-2 cm, ciliate. Flowers with biology unknown, subsessile. Calyx densely villous; hypanthium subglobose, ca. 2 mm; lobes filiform, 7-8 mm, ciliate. Corolla white, tubular-funnelform, puberulent outside; tube ca. 18 mm, in throat notably expanded, inside villous above middle; lobes oblong-ovate, ca. 4 mm. Capsules obovate, ca. 5 × 10 mm. Fl. Sep.

● Broad-leaved forests on mountain slopes; ca. 1700 m. Xizang (Mêdog).