e-Flora of Thailand
Volume 12 > Part 1 > Year 2011 > Page 19 > Orchidaceae > Anoectochilus
6. Anoectochilus roxburghii (Wall.) Lindl.
Gen. Sp. Orchid. Pl.: 499. 1840; Hook.f., Fl. Brit. India 6: 95. 1890; Seidenf. & Smitinand, Orchids Thail.: 734, fig. 546. 1965; Seidenf., Bot. Tidsskr. 66: 322, fig. 15. 1971; Dansk Bot. Ark, 32(2): 52, fig. 30. 1978; Opera Bot. 114: 31. 1992; N.Pearce & P.J.Cribb, Fl. Bhutan 3(3): 76, fig. 18. 2002; Pridgeon et al., Gen. Orchid. 3: 72, fig. 133.1. 2003; Sitthisajjadham, Wild Orchids Thail. [in Thai): 69. 2006; S.C.Chen et al. in Z.Y. Wu et al. (eds), Fl. China 25: 79. 2009.— Chrysobaphus roxburghii Wall., Tent. Fl. Napal. 2: 37, t. 27. 1826. Fig. 7; Plate I: 3.
Accepted Name : This is currently accepted.
Synonyms & Citations :
Description : Flowering shoots 11–30 cm tall, Foliage leaves velvety, dark green with golden to copper red reticulation above, uniformly pinkish-purple below; lamina obliquely elliptic to broadly ovate, short-acuminate to acute or rounded, mucronate, 1.1–7.8 by 0.9–5.5 cm. Inflorescence glandular-pubescent; rachis up to 15 cm long, 2- to 15-flowered (rarely 1-flowered); bracts ovate, 1- to 3-veined, glandular-pubescent on the dorsal side, 5–15 by 4–6.8 mm. Flowers short pedicelled, mainly green to whitish-pink with white labellum and column. Sepals glandular pubescent on the dorsal side; dorsal sepal recurved at apex, ovate, 6.4–6.7 by 3.5–5.2 mm; lateral sepals obliquely lanceolate-oblong, 7.4–8.8 by 3.4–4.3 mm. Petals very obliquely oblanceolate, 6.3–6.7 by 2.4–2.5 mm. Labellum 6.2–7.5 mm long along the mid-line; spur pointing forwards (more or less continuing the line of the ovary), describing an acute angle to the mesochile, slenderly conical, retuse to emarginate, 2.5–5.2 mm long, approximately the distal half protruding below the bases of the lateral sepals; mesochile with a pair of pectinate flanges; epichile lobules 4–10 mm long, 2–3 times as long as wide, describing an acute to obtuse angle to each other when flattened, forming a tiny conical receptacle at base. Column reflexed (describing an acute angle to the ovary), 3.4–4.4 mm long; wings on the front not prolonged into the spur; anther 3.4–3.6 mm long. Ovary (including pedicel) 8.5–16.6 mm long. Capsule suberect, short-pedicelled, 1.5–1.8 cm long, 0.7–0.8 cm in diameter.
Thailand : NORTHERN: Chiang Mai (Doi Ang Ka), Nan, Phitsanulok (Phu Hin Rong Kla); NORTH-EASTERN: Phetchabun (Nam Nao), Loei.
Distribution : NW Himalaya, Nepal (type), NE India, Bhutan, Bangladesh, Myanmar, SE Tibet, S China, Laos, Vietnam, Japan.
Ecology : Shaded humus-rich, often moist ground in hill evergreen forests and bamboo thickets on sandstone bedrock; 1,100–1,600 m alt. Flowering: October–December.
Vernacular : Wan mai na (ว่านไหมนา).
Notes: This species is easily recognized, being the only Thai Anoectochilus in which the spur is pointing forwards, more or less continuing the line of the ovary. I have seen no herbarium specimen of A. roxburghii from Phetchabun; the above record from this province is based on Tokaew & Chantaranothai (2009).