3. Illigera nervosa Merrill, Brittonia. 4: 63. 1941.
显脉青藤 xian mai qing teng
Lianas. Stem purple-brown, angulate, glabrous. Leaves 3-foliolate; petiole 7-12 cm, glabrous; leaflets: petiolules 2-3 cm, sparsely pubescent when young; blade ovate or elliptic-ovate, 7-16 × 4-9 cm, papery or thickly so, lateral veins 4- or 5-paired, conspicuous on both surfaces, veinlets slightly conspicuous abaxially, base subcordate, apex shortly acuminate. Cymes axillary, shorter than leaves; rachis glabrous. Flowers red-yellow. Outer tepals oblong, 7-8 mm, pellucid-glandular, abaxially pubescent. Inner tepals similar to outer ones but shorter, pellucid-glandular. Stamens ca. 3.5 mm; filaments straight in bud, ca. 4 mm, pubescent; appendages membranous, abaxially with open mouth, ca. 3 mm. Ovary ca. 1.5 mm, glabrous; style ca. 5 mm, villous. Interstaminal glands small, 2-lobed. Fruit 5.5-6 cm in diam., 4-winged; large wings ca. 2.5 cm wide, smaller 2 wings ca. 0.5 mm or cristate. Fl. Jun, fr. Nov-Dec.
Thickets, forests; 800-2100 m. SW Yunnan [N Myanmar].