《中国植物志》|| 豆科 LEGUMINOSAE ||刀豆亚族 Subtrib. Diocleinae Benth. ||乳豆属 Galactia P. Br.

51. 乳豆属 Galactia P. Br.
P. Br. Hist. Jamaica 298. 1756; Adans. Fam. 2:322. 1763; Benth. et Hook. f. Gen. Pl. 1: 535. 1865; Taub. in Engl. u. Prantl Nat. Pflanzenfam. 3(3): 386. 1894; Hutch. Gen. Fl. Pl. 1: 429. 1964.
平卧或缠绕草本或亚灌木。羽状复叶有小叶3片，稀1-7片；托叶小，脱落或宿存；小托叶宿存。总状花序腋生，花序轴具疏离而微肿胀的节；苞片小，针状，小苞片微小；花单生、孪生或簇生于花序轴的节上；花萼深4裂，裂片线形或披针形，上面1片较宽，由2裂片完全合生而成，下面中央1片最长，两侧的略短小；花冠稍伸出于萼外，各瓣近等长，旗瓣圆形、卵形或倒卵状圆形，近基部边缘稍弯或有附属体；翼瓣狭或倒卵形，与龙骨瓣贴生；龙骨瓣钝而稍直，与翼瓣等长或稍过之；雄蕊10枚，二体，对旗瓣的1枚与雄蕊管完全离生或中部以下合生；花药一式；子房近无柄，有胚珠多颗，花柱丝状，无毛，柱头小，头状，顶生。荚果线形，扁平，直或稍弯，2瓣裂，果瓣内种子间常有隔膜；种子小，两侧压扁，无种阜。
属模式种：Galactia pendula Pers.
约140种，分布于美洲和亚洲热带和亚热带地区。我国有3种，产于台湾、广东、广西、云南等省区。

《云南植物志》|| 蝶形花科 Papilionaceae ||菜豆族 Trib. Phaseoleae DC. ||乳豆属 Galactia P. Br.

45. 乳豆属 Galactia P. Br.
平卧或缠绕草本或亚灌木。羽状复叶具3小叶，稀1-7片；托叶小，脱落或宿存；小托叶宿存。总状花序腋生，花序轴具疏离而微肿胀的节，花单生、孪生或簇生在节上；苞片小，针状，小苞片微小；花萼5裂，裂片线形或披针形，上面2裂片完全合生，下面中央1片最长，两侧的略短小；花冠稍伸出萼外，各瓣近等长，旗瓣圆形、卵形或倒卵状圆形，近基部边缘稍弯或有附属体，翼瓣狭或倒卵形，与龙骨瓣贴生，龙骨瓣钝而稍直，与翼瓣等长或稍过之；雄蕊二体，对旗瓣的1枚与雄蕊管完全离生或中部以上合生，花药同型；子房近无柄，基部有鞘状腺体，有胚珠多颗，花柱丝状，无毛，柱头小，头状，顶生。荚果线形，扁平，直或稍弯，2瓣裂，果瓣内种子间常有隔膜；种子小，两侧压扁，无种阜。
约140种，分布于美洲和亚洲热带地区。我国有3种；云南产2种。

《Flora of China》|| Fabaceae || ||乳豆属 Galactia

80. Galactia P. Browne, Civ. Nat. Hist. Jamaica. 298. 1756.

乳豆属 ru dou shu

Authors: Dezhao Chen, Prof. Dianxiang Zhang & Mats Thulin

Herbs or subshrubs, prostrate or twining. Leaves pinnately 3-foliolate, rarely 1-7-foliolate; stipules small, deciduous or persis­tent; stipels persistent. Racemes axillary; rachis with remote and slightly swollen nodes; bracts small, setaceous; bracteoles minute. Flowers solitary, paired, or several clustered at nodes of rachis. Calyx lobes linear or lanceolate, upper 2 entirely connate into 1, lat­eral slightly smaller, lowest often longest. Corolla slightly exserted; petals subequal in length; standard orbicular, ovate, or obovate-orbicular, margin slightly inflexed or appendaged; wings narrow or obovate, adherent to keel; keel obtuse and almost straight, sub­equal to or longer than wings. Stamens diadelphous; vexillary stamen free or connate from middle downward; anthers uniform. Ovary subsessile; ovules numerous; style filiform, glabrous; stigma small, capitate, terminal. Legumes linear, compressed, straight or slightly incurved, ± septate between seeds. Seeds small, compressed, estrophiolate.

About 60 species: tropical and subtropical Asia, Africa, and America; two species in China.