Gastrodia angusta S. Chow et S. C. Chen

Li, Jian-Wu, Huang, Lu-Qi, Li, Guo-Wu, Pan, Bo, Yin, Jian-Tao & Jin, Xiao-Hua, 2018, Lectotype, epitype and amendment of Gastrodia angusta (Orchidaceae), Phytotaxa 356 (4), pp. 291-296 : 295-296

Gastrodia angusta S. Chow et S. C. Chen in Acta Bot. Yunnan. 5(4): 363. 1983.

Lectotype (designated here): — CHINA, Shuigongqing Nature village, Sanjia Village , Longpeng Town , Shiping County, Yunnan Province. Under bamboo forests, alt. 1700 m, 5 April 1974, S. Chow, Y. H. Yang & H. S. Liang 7401 (lectotype: KUN No. 0484714; isolectotype: KUN No. 0484713; both KUN No. 0548938 and 0548939 has rejected).

Epitype (designated here): — CHINA. Shuigongqing Nature village, Sanjia Village, Longpeng Town, Shiping County, Honghe Prefecture, Yunnan Province. Under bamboo forests, E: 102°33 ′, N: 23°51 ′, alt. 1900 m, 18 April 2016, Jian-Wu LI 4540 (epitype, isoepitype: HITBC!). Figures 2–3.

Taxonomic revision:— Mycoheterotrophic plants, leafless. Corm fleshy, fusiform, 4–15 cm long, 1–5 cm in diam. at middle, sometimes larger, densely noded, with triangular scales at nodes. Inflorescence terminal, erect, gray brown, 40–80 cm long, sometimes up to 150 cm, 4–8 mm in diam., peduncle with 3–7 sheaths, sheath concave, membranous, 8–15 mm long; rachis 3–40 cm long, subdensely to densely with 3–40-flowered, floral bracts ovate-triangular, ca. 8 mm long, 3.5–4.0 mm wide, apex acuminate. Flowers suberect, white, not open widely; pedicel and ovary ca. 15 mm long. Sepal tube urceolate, 15–16 mm long, 9–10 mm in diam., lobed at apex, with a deep sinus between lateral sepals; lobe of dorsal sepal ovate-rounded, ca. 4 mm, margins sometime irregular erose, apex slightly emarginated; lobes of lateral sepals triangular, ca. 5 mm long, 7 mm wide, margins sometime irregular erose, apex obtuse, mid-vine convex abaxially, and with 3–5 dens, ca. 0.5 mm long; petals ovate, ca. 3 mm long, 2.5 mm wide, margins involute, apex truncate; lip triangular-oblong, ca. 16 mm long; epichile ca. 11 mm long, 6 mm wide at base, margins undulate and irregular erose, apex rounded and sometime irregular erose, disc with a longitudinal yellow, rugose, 2 mm wide belt, mid-vine concave abaxially; margins of mesochile retrousse and folded, forming two upright, semi-orbicular lamella on hypochile, lamellae 5 mm long, ca. 2 mm high, inside densely with orange-yellow powder particles (pseudo-pollen). Column ca. 10 mm long, 4 mm wide, wings ca. 0.7 mm wide, stelidias ca. 1 mm long; column foot short, ca. 2 mm long; pollinia 2.

Phenology:— Flowering from March to early May.

Distribution and habitat:— Gastrodia angusta was found in Shiping County, Honghe Perfecture, Yunnan Province, China, at elevations 1680–2050 m, terrestrial under bamboo forests.