Niu Dali generally refers to Big Mouth Lip.

Big Mouth Lip is also known as the beautiful cliff bean vine (scientific name: Millettia speciosa? Champ.) is for the legume family, cliff bean vine genus vine plants, bark brown. Branchlets terete, initially brown tomentose, gradually glabrescent. Leaf rachis hairy, grooved above; stipules lanceolate; leaflets stiffly papery, oblong-lanceolate or elliptic-lanceolate, base obtuse-rounded.

Margins slightly revolute, glabrous and shiny above, rust-colored pilose or glabrous below, bracts lanceolate-ovate, deciduous; bracteoles ovate, free from calyx; flowers large, fragrant.

Morphological features

Upright or lanceolate subshrub, 1 to 2 meters high. The root system extends straight downward, about 1 meter long. Young branches angular, whitish pilose. Leaves alternate, bullate; 3-ovate compound; stipules 2, triangular, ca. 1 cm long, sparsely velutinous; petiole 2-3 cm long, long velutinous; leaflets rectangular to ovate-lanceolate, 4-9 cm long.

2 to 4 cm wide, apex slightly obtuse, sometimes with a small acute tip, entire, base densely velutinous at the abaxial margin of the leaf, sparsely velutinous above, densely velutinous below; stipules 2, linear. Flowers bisexual, axillary, short racemes densely packed; pedicels 1 to 1.5 cm long; bracts 2-lobed; calyx 5-lobed, lanceolate, longest in the lowermost 1 piece; corolla slightly longer than calyx, pink.