11. Peristylus affinis (D. Don) Seidenfaden, Dansk Bot. Ark. 31(3): 48. 1977.
小花阔蕊兰 xiao hua kuo rui lan
Habenaria affinis D. Don, Prodr. Fl. Nepal. 25. 1825; Gymnadenia affinis (D. Don) H. G. Reichenbach; H. cavaleriei Schlechter; H. goodyeroides D. Don var. affinis (D. Don) King & Pantling; H. sampsonii (Hance) Hance; Peristylus goodyeroides (D. Don) Lindley var. affinis (D. Don) Cooke; P. sampsonii Hance; Phyllomphax affinis (D. Don) Schlechter.
Plants slender, 21-54 cm tall. Tubers oblong-ellipsoid, 1-2 × 0.4-1 cm. Stem with 2-4 tubular sheaths at base, 3-5-leaved. Leaves clustered to somewhat spaced along stem, elliptic to ovate-lanceolate, 2.5-9 × 1-3.5 cm, apex acute. Inflorescence 14-25 cm; peduncle cylindric, slender; sterile bracts 1 or 2, lanceolate, ca. 15 mm; rachis 8-15 cm, subdensely several to many flowered; floral bracts ovate-lanceolate, 8-10 mm, ca. as long as to slightly exceeding ovary, apex acuminate. Flowers erect; sepals olive to brownish green, petals and lip creamy white; ovary 8-10 mm including pedicel. Dorsal sepal erect, oblong, slightly concave, ca. 3 × 1.5-1.8 mm, 1-veined, apex obtuse; lateral sepals spreading, oblong, ca. 3 × 1.2 mm, 1-veined, apex obtuse. Petals forming a loose hood with dorsal sepal, ovate, oblique, ca. 2.5 × 2 mm, 1-veined, apex obtuse; lip spreading, oblong-obovate, 2.5-3 × ca. 1.8 mm, ecallose, papillose near mouth of spur, base concave-saccate, 3-lobed near middle; lateral lobes diverging at an acute angle from axis of lip, oblong, to ca. 1 mm, apex obtuse; mid-lobe oblong, ca. 1.2 mm, broader than lateral lobes, apex obtuse; spur pendulous, saccate, 0.8-1.2 mm, apex rounded. Column ca. 0.8 mm; viscidia subellipsoid; rostellum small, with short arms on both sides. Fl. Jun-Sep. 2n = 28, 42, 44, 46 + 0-3B.
Evergreen broad-leaved forests, open scrub along valleys, roadsides, grassy slopes; 400-3000 m. Guangdong, Guangxi, Guizhou, Hubei, Hunan, Jiangxi, Sichuan, Yunnan [NE India, Laos, Myanmar, Nepal, Thailand].