《中国植物志》|| 伞形科 UMBELLIFERAE ||天胡荽亚科 HYDROCOTYLOIDEAE Drude ||天胡荽属 Hydrocotyle L.

1．天胡荽属——Hydrocotyle L.
L. Sp. Pl. 234, 1753; A. Rich. Monogr. 24. 1820.
多年生草本。茎细长，匍匐或直立。叶片心形、圆形、肾形或五角形，有裂齿或掌状分裂；叶柄细长，无叶鞘；托叶细小，膜质。花序通常为单伞形花序，细小，有多数小花，密集呈头状；花序梗通常生自叶腋，短或长过叶柄；花白色、绿色或淡黄色；无萼齿；花瓣卵形，在花蕾时镊合状排列。果实心状圆形，两侧扁压，背部圆钝，背棱和中棱显著，侧棱常藏于合生面，表面无网纹，油管不明显，内果皮有1层厚壁细胞，围绕着种子胚乳。
本属约75种，分布在热带和温带地区；我国有10余种，产于华东、中南及西南各省区。
本属的模式种：欧洲天胡荽 Hydrocotyle vulgaris L.

《云南植物志》|| 伞形科 Umbelliferae, nom. fam. conserv. ||天胡荽亚科 Hydrocotyloideae ||天胡荽属 Hydrocotyle L.

1.天胡荽属 Hydrocotyle L.
多年生草本；茎细长，匍匐或直立。叶心形，圆形，肾形或五角形，有裂齿或掌状分裂；叶柄细长，无叶鞘；托叶细小，膜质。花序通常为单伞形花序，有多数小花，密集呈头状；花序梗通常生自叶腋，短或长过叶柄；花白色、绿色或淡黄色；无萼齿；花瓣卵形，在花蕾时镊合状排列。果实心脏圆形，两侧扁压，背部圆钝，背棱和中棱显著，侧棱通常藏于合生面，表面无网纹，油管不明显，内果皮有一层厚壁细胞，围绕着种子胚乳。
约75—100种，分布于热带和温带地区。我国有13种4亚种及1变种，产华东、中南及西南各省区；云南有7种4亚种。个别系统中独立成科。

《Flora of China》|| Apiaceae || ||天胡荽属 Hydrocotyle

1. Hydrocotyle Linnaeus, Sp. Pl. 1: 234. 1753.

天胡荽属 tian hu sui shu

She Menglan (佘孟兰 Sheh Meng-lan); Mark F. Watson, John F. M. Cannon

Herbs perennial. Stem slender, creeping or decumbent, rooting at the nodes. Leaves petiolate; petioles not sheathing; stipules present, entire or parted to base, membranous; blade cordate, orbicular, or reniform. Inflorescence a simple umbel; umbels sometimes densely capitate; peduncles axillary, obsolete to much longer than leaves; bracts present or absent; pedicels very short or extended (best seen in fruiting material). Flowers bisexual. Calyx teeth minute or obsolete. Petals white, greenish or yellow, valvate, ovate, spreading. Stylopodium conic to depressed. Fruit globose or ellipsoid, strongly flattened laterally, base cordate, dorsal surface rounded, glabrous (rarely with white hairs); dorsal and lateral ribs usually conspicuous, slender, acute (rarely obsolete); vittae inconspicuous. Seed face plane to concave; endocarp woody. Carpophore usually absent.

About 75(–100) species: tropical and temperate regions worldwide; 14 species (five endemic) in China.