《中国植物志》|| 木通科 LARDIZABALACEAE ||三叶木通 Akebia trifoliata (Thunb.) Koidz. ||长萼三叶木通(亚种) Akebia trifoliata (Thunb.) Koidz. subsp. longisepala H.N.Qin

3c．长萼三叶木通（亚种）
Akebia trifoliata (Thunb.) Koidz. subsp. longisepala H. N. Qin in Cathaya 8-9: 71. 1997.
落叶或半落叶缠绕藤本。茎皮紫褐色，具多数小皮孔。叶具小叶3片，极稀为4-5片；叶柄长5-8.5厘米；小叶革质，卵形或卵状长圆形，长3-6厘米，宽2-3.5厘米，先端钝，基部楔形，边近全缘；基出脉3。花多朵组成腋生、长6-8厘米的总状花序，每花序有雄花7-10朵，雌花2朵。雄花：花梗长约5毫米；萼片3或4片，长圆形，长9-12毫米；雄蕊长2.5-3.5毫米。雌花：花梗长1.5-3厘米；萼片紫黑色，近线形或狭长圆形，长2.2-2.7厘米；心皮4-6，圆柱形，长4-6毫米。果未见。花期4月。
产于甘肃（文县）。生于海拔650-800米的山坡溪旁林中。

《Flora of China》|| Lardizabalaceae || Akebia ||长萼三叶木通 Akebia trifoliata

3c. Akebia trifoliata subsp. longisepala H. N. Qin, Cathaya. 8-9: 71. 1997.

长萼三叶木通 chang e san ye mu tong

Stems with purplish brown bark; lenticels numerous. Leaves 8--16 cm; petiole 5--8.5 cm; leaflets 3(--5), ovate to ovate-oblong, 3--6 × 2--3.5 cm, leathery, base truncate to cuneate, margin subentire, apex obtuse; primary veins 3 from base. Racemes axillary, 6--8 cm, with 7 or 8 male and 2 female flowers. Male flowers: pedicel ca. 5 mm. Sepals 3 or 4, oblong, 0.9--1.2 cm. Stamens 2.5--3.5 mm. Female flowers: pedicel 1.5--3 cm. Sepals purplish black, sublinear to narrowly oblong, 2.2--2.7 cm. Carpels 4--6, cylindric, 4--6 mm. Fruit not seen. Fl. Apr.

* Semideciduous forest margins, hillsides, by streams; 600--800 m. SE Gansu (Wen Xian).