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wider than dorsal sepal. Petals narrowly oblong, 1–1.2 × ca. 0.2<br />
mm, abaxially with setiform protrusions near apex, apex obtuse;<br />
lip suboblong, 1–1.3 mm, inconspicuously 3-lobed; lateral<br />
lobes with several irregularly fimbriate laciniae on margins;<br />
mid-lobe with several similar laciniae on margin, central lacinia<br />
to 1 mm, longer than lateral ones. Column short, stout. Capsule<br />
subellipsoid, ca. 4 × 2.5–3 mm; fruiting pedicel less than 0.5<br />
mm. Fl. and fr. Aug–Oct.<br />
EPIDENDROIDEAE<br />
245<br />
Epiphytic on branches of trees in forests or thickets; 1200–1500<br />
m. W Guangxi, S and SW Guizhou, Jiangxi, Sichuan, S and SE Yunnan<br />
[India, Myanmar, Nepal, Thailand, Vietnam].<br />
Lindley (Gen. Sp. Orchid. Pl. 16. 1830) misapplied the name<br />
Oberonia myosurus (Forster) Lindley to this species when judging<br />
Wallich 1947 to be conspecific with the Pacific island Epidendrum<br />
myosurus Forster, which is now referred to Phreatia myosurus (Forster)<br />
Ames (see Seidenfaden, Opera Bot. 124: 19. 1995).<br />
82. RISLEYA King & Pantling, Ann. Roy. Bot. Gard. Calcutta 8: 246. 1898.<br />
紫茎兰属 zi jing lan shu<br />
Chen Xinqi (陈心启 Chen Sing-chi); Stephan W. Gale, Phillip J. Cribb<br />
Herbs, terrestrial, holomycotrophic, leafless. Rhizome subterranean, creeping, with a few widely spaced roots. Stem erect,<br />
cylindric, leafless, glabrous, with 2 or 3 sheaths at base. Inflorescence terminal, racemose, glabrous, densely many flowered; floral<br />
bracts persistent. Flowers very small, not resupinate, fleshy. Sepals similar, free. Petals usually shorter and narrower than sepals; lip<br />
superior, unlobed, concave. Column clavate, short; anther subterminal, 2-locular; pollinia 4, in 2 pairs, waxy, without caudicle,<br />
directly attached to a thick, oblong viscidium; rostellum stout, exserted, protruding beyond anther.<br />
One species: Bhutan, China, India (Sikkim), Myanmar.<br />
1. Risleya atropurpurea King & Pantling, Ann. Roy. Bot.<br />
Gard. Calcutta 8: 247. 1898.<br />
紫茎兰 zi jing lan<br />
Plants 6–21 cm tall. Rhizome narrowly conic to cylindric,<br />
1–3 cm, 1.5–2 mm in diam., fleshy. Stem dark purple, with 2 or<br />
3 sheaths at base; sheaths tubular, amplexicaul, 0.6–2.5 cm,<br />
membranous. Rachis (1–)2.5–7 cm, densely 15–<strong>25</strong>(–40)-flowered;<br />
floral bracts triangular-lanceolate or linear-lanceolate,<br />
0.5–0.8 mm, membranous. Flowers dark purple, ca. 2 mm in<br />
diam.; pedicel and ovary 1.2–1.5 mm; ovary strongly twisted.<br />
Sepals spreading, suboblong, ca. 1.2 × 0.4 mm, apex obtuse.<br />
Petals spreading, suboblong-lanceolate, ca. 0.8 × 0.3 mm, apex<br />
acute; lip adnate to column at base, broadly ovate, concave, ca.<br />
1.2 × 1 mm, basal margin denticulate, apex with an upcurved<br />
mucro. Column ca. 0.3 mm. Capsule ellipsoid, 3–3.5 × 2–2.5<br />
mm. Fl. Jul–Aug.<br />
Picea forests or thickets; 2900–3700 m. SW Sichuan, SE Xizang,<br />
NW Yunnan [Bhutan, India (Sikkim), Myanmar].<br />
83. OREORCHIS Lindley, J. Proc. Linn. Soc., Bot. 3: 26. 1858.<br />
山兰属 shan lan shu<br />
Chen Xinqi (陈心启 Chen Sing-chi); Phillip J. Cribb, Stephan W. Gale<br />
Herbs, terrestrial. Pseudobulb cormlike, subterranean, ovoid-oblong, several noded, with fibrous roots at base, occasionally persisting<br />
and remaining connected to pseudobulbs produced in subsequent years by means of a slender rhizome. Leaves 1 or 2, arising<br />
from apex of pseudobulb, linear to oblong-lanceolate, plicate, tapering into a long petiole-like stalk at base, often with 1 or 2 membranous<br />
sheaths at base. Inflorescence arising from an intermediate node of pseudobulb, erect, terminal, with several tubular sheaths,<br />
racemose; rachis several to many flowered; floral bracts persistent, membranous. Flowers small to medium-sized, resupinate. Sepals<br />
and petals free, similar, spreading; lateral sepals sometimes shallowly saccate at base. Lip 3-lobed or entire, clawed at base, without a<br />
spur; disk usually with a pair of longitudinal lamellae or a callus, rarely without either. Column long, slightly arcuate, base sometimes<br />
dilated, but without a conspicuous foot; anther terminal, incumbent; pollinia 4, subglobose, waxy, borne on a common stipe<br />
and attached to a globose viscidium.<br />
About 16 species: Bhutan, E and SW China, NE India, Japan, Korea, Myanmar, Nepal, E Russia (Far East, Siberia); 11 species (seven endemic)<br />
in China.<br />
1a. Leaves 2–4 cm, 2–4 × as long as wide, abruptly contracted at base into a distinct petiole-like stalk.<br />
2a. Inflorescence subdensely (2–)5–14-flowered; sepals 6–7 mm; lip 5–7 mm, yellow, with purple spots .................. 10. O. nana<br />
2b. Inflorescence laxly 1–3(or 4)-flowered; sepals 12–15 mm; lip 8–10 mm, white to pale purple, with<br />
purple spots .......................................................................................................................................................... 11. O. oligantha<br />
1b. Leaves 7–40 cm, 5–20 × as long as wide, tapering at base into a sometimes indistinct petiole-like stalk.<br />
3a. Dorsal sepal 15–16 mm; column ca. 8 mm ......................................................................................................... 9. O. nepalensis<br />
3b. Dorsal sepal 5.5–11 mm; column 2.5–6 mm.<br />
4a. Lip lacking a callus, 3-lobed above middle or sometimes entire ....................................................................... 8. O. foliosa<br />
4b. Lip with a callus or a pair of lamellae, 3-lobed at or below middle, never entire.<br />
5a. Plants 2-leaved.