- Scientific Name: Ponerorchis gracilis (Blume) X.H.Jin, Schuit. & W.T.Jin
- Ref: Molec. Phylogen. Evol. 77:51. 2014
- Synonyms: Amitostigma chinense (Rolfe) Schltr., A. gracile (Blume) Schltr., A. yunkianum Fukuy., Cynorkis chinensis Rolfe, C. gracilis (Blume) Kraenzl., Gymnadenia gracilis (Blume) Miq., G. mitostigma Makino, G. tryphiiformis Rchb.f., Mitostigma gracile Blume, Orchis formosensis S.S.Ying, O. gracilis (Blume) Soó, O. sooi S.S.Ying, O. yunkiana (Fukuy.) S.S.Ying
- English Common Name: delicate amitostigma
- Chinese Common Name: 无柱兰 wúzhù∙lán, 细葶无柱兰 xìtíng wúzhù∙lán
- Japanese Common Name: ヒナラン [雛蘭] hinaran
- Family: Orchidaceae
- Genus: Ponerorchis
- Distribution: Damp rocky soils in forests, crevices, valleys; 200-3000 m. Anhui, N Fujian, Guangxi, Guizhou, Hebei, Henan, Hubei, Hunan, Jiangsu, Liaoning, Shaanxi, Shandong, Sichuan, Taiwan, Zhejiang [Japan, Korea].
- Photo: 06/12/2013, Baizhang Ridge, Zhejiang
Plants 7-25 cm tall. Tubers ovoid to oblong-ellipsoid, 8-15 × 5-10 cm. Stem with 1 or 2 tubular sheaths at base, 1-leaved. Leaf usually basal, porrect, oblong to ovate-lanceolate, 3-12 × 0.8-3 cm, apex obtuse or acute. Peduncle with 1 sterile bract; rachis 0.5-4 cm, subdensely 5- to more than 15-flowered; floral bracts ovate-lanceolate, 2-3 mm, much shorter than ovary. Flowers often secund, pink, purplish red, or purple; ovary and pedicel 4-8 mm, usually straight. Dorsal sepal ovate, concave, 2-3 × 1.2-2 mm, 1-veined, apex obtuse; lateral sepals erect to spreading, ovate to obovate, slightly oblique, 2-3 × 1.2-1.8 mm, 1-veined, apex obtuse. Petals connivent with dorsal sepal and forming a hood, elliptic to ovate, oblique, 2-3 × ca. 2 mm, 1-veined, apex acute to obtuse; lip obovate, 3.5-5(-7) × 2.5-3.2 mm, 5-7(-9)-veined, base cuneate, 3-lobed above middle; lateral lobes linear-oblong to triangular, often falcate, 1-2 × 0.5-0.8 mm, apex obtuse-truncate or acute; mid-lobe obovate, 2-2.8 × 1.2-1.8 mm, larger than lateral lobes, apex truncate or obtuse-rounded, sometimes emarginate; spur pendulous, straight to very slightly incurved, cylindric, 1-2.5(-3.5) mm, much shorter than ovary, apex obtuse; viscidia elliptic; stigma lobes subclavate. Fl. Jun-Jul, fr. Sep-Oct. 2n = 42. (Flora of China)
