2. Ponerorchis monophylla (Collett & Hemsley) Soó, Acta Bot. Acad. Sci. Hung. 12: 353. 1966.
毛轴小红门兰 mao zhou xiao hong men lan
Habenaria monophylla Collett & Hemsley, J. Linn. Soc., Bot. 28: 134. 1890; Chusua monophylla (Collett & Hemsley) P. F. Hunt; Orchis geniculata Finet; O. monophylla (Collett & Hemsley) Rolfe; Peristylus monophyllus (Collett & Hemsley) Kraenzlin; Sirindhornia monophylla (Collett & Hemsley) H. A. Pedersen & Suksathan.
Plants 12-25 cm tall. Tubers oblong, 10-35 mm. Stem 1-3 cm, slender, with 2 tubular, membranous sheaths at base, 1-leaved. Leaf basal, abaxially purplish red, adaxially deep green with dark purple spots, cordate, ovate, or elliptic, 3-6 × 2.5-3.5 cm, sparsely pubescent on principal veins on both surfaces, apex acute. Inflorescence erect or slightly curved, 9-19 cm, with 2 or 3 lanceolate sterile bracts, pubescent; rachis 4-10 cm, laxly several to subdensely more than 20-flowered; floral bracts ovate-lanceolate or ovate, 5-9 mm, usually shorter than ovary, margin ciliate, apex acuminate. Flowers often secund, pinkish white or purplish rose, small to medium-sized; ovary cylindric, 6-10 mm including pedicel, slender, pubescent. Dorsal sepal erect, oblong, concave, 3.5-5 × 2-2.5 mm, 3-veined, apex subobtuse; lateral sepals obliquely ovate-elliptic, 4-5 × 2-3 mm, 3-veined, apex obtuse. Petals erect, forming a hood with dorsal sepal, marked with chestnut-colored spots, suboblong, 3.5-5 × 1.5-2.5 mm, glabrous, 2-veined, apex obtuse; lip spreading, obtriangular-flabellate, 5-6 × 5-6 mm, 3-lobed above middle, spurred, disk papillose, base narrowed and cuneate; lateral lobes obliquely subsquare, 1.2-2 × 1-2 mm, apical margin minutely crenulate, apex truncate; mid-lobe subsquare, 1-1.5 × 1-1.8 mm, apex obtuse-rounded, sometimes emarginate; spur pendulous, slightly bent forward, cylindric, 4-6 mm, much shorter than to almost as long as ovary, apex obtuse. Fl. Jun-Aug.
Forests; ca. 1200 m. C and SE Yunnan [Myanmar].