3. Nervilia mackinnonii (Duthie) Schlechter, Bot. Jahrb. Syst. 45: 402. 1911.
七角叶芋兰 qi jiao ye yu lan
Pogonia mackinnonii Duthie, J. Asiat. Soc. Bengal, Pt. 2, Nat. Hist. 71: 43. 1902.
Tuber whitish, subglobose, 7-12 mm in diam., 3-5-noded. Leaf green on both surfaces, 7-sided to cordate, 2.5-4.5 × 3.7-5 cm, membranous, glabrous, with 7 main veins, base deeply cordate, margin cornutely toothed at tips of main veins, apex acute; petiole-like stalk erect, 4-7 cm, with 1 or 2 short tubular sheaths near base. Inflorescence 6-10 cm, 1-flowered; peduncle brown, with 2 or 3 tubular sheaths, elongating in fruit; floral bract lanceolate, 2.5-5 × ca. 1 mm, apex acute. Flower nodding, resupinate, opening widely or not; pedicel and ovary 4-7 mm. Sepals light greenish beige with purplish flecks on outer surfaces, linear-lanceolate, 14-17 × ca. 2 mm, apex acuminate. Petals light greenish beige with purplish flecks on outer surfaces, linear-lanceolate, 13-16 × ca. 1.5 mm, apex acute; lip white tinged pale green at base and with purple blotches on mid-lobe, oblong, ca. 14 × 5 mm, spurless, 3-lobed near middle; lateral lobes erect and loosely embracing column, triangular, ca. 3 × 0.8 mm, apices acute; mid-lobe narrowly oblong, 6-7.5 × ca. 2.5 mm, apex obtuse; disk with 3 thickened central veins. Column 6-7 mm; stigma shield-shaped. Fl. May. 2n = 36.
Forests; 900-1400 m. S Guizhou, C and NW Yunnan [NE India, Myanmar].