FOC_25_Epidendroidea..

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