FOC_25_Epidendroidea..

388
oblique; mentum subcylindric, ca. 4 mm. Petals suboblong, ca.
23 × 10 mm, 5-veined, base contracted, margin irregularly denticulate,
apex acute; lip suborbicular, ca. 22 × 25 mm, adaxially
densely barbellate, margin erose, apex emarginate. Column
very short, ca. 5 mm, foot ca. 4 mm; anther cap conic, densely
finely papillate, front margin irregularly dentate, apex obtuse.
Capsule narrowly cylindric, 6–7 × 0.5–0.6 cm, with a stalk ca. 1
cm.
Epiphytic on tree trunks in mountain forests; 800–1200 m. S Yunnan
[Laos, Myanmar, Thailand].
This species was misidentified by S. C. Chen and Z. H. Tsi (Orchids
China, 156. 1998) as Dendrobium moulmeinense (a synonym of
D. devonianum in the present treatment).
51. Dendrobium henryi Schlechter, Repert. Spec. Nov. Regni
Veg. 17: 67. 1921.
疏花石斛 shu hua shi hu
Dendrobium daoense Gagnepain; D. evaginatum Gagnepain;
Grastidium daoense (Gagnepain) Rauschert.
Stems ascending or pendulous, cylindric, 30–80 cm, 5–8
mm in diam., unbranched, with many nodes, internodes 3–4.5
cm, pale yellow when dry. Leaves oblong or oblong-lanceolate,
8.5–11 × 1.7–3 cm, leathery, base contracted and dilated into
EPIDENDROIDEAE
sheaths, apex acuminate or acute; leaf sheath tightly embracing
stem, papery, sheath mouth often open when dry. Inflorescence
on middle part of old leafy or leafless stems, 1- or 2-flowered;
peduncle nearly perpendicular to stem, 1.5–2.5 cm; basal
sheaths 3 or 4, tubular, 2–3 mm, membranous; floral bracts
ovate-triangular, 6–9 mm, papery, apex obtuse. Pedicel and
ovary ca. 2 cm. Flowers fragrant, thinly textured, golden yellow.
Dorsal sepal ovate-oblong, 23–30 × 10–12(or more) mm,
7-veined, with many transverse veins, apex obtuse; lateral sepals
ovate-lanceolate, 23–30 × 10–12(or more) mm, apex acuminate;
mentum broadly conic, ca. 5 mm, apex rounded. Petals
slightly obliquely broadly ovate, slightly shorter than sepal, but
relatively wide, 7-veined, with many secondary veins, base
shortly clawed, apex acute; lip suborbicular, 2–3 cm, base with
a claw ca. 3 mm, both sides embracing column, margin irregularly
denticulate; disk concave, densely finely papillate. Column
ca. 3 mm; anther cap conic, ca. 2 mm, densely finely
papillate, front margin ± irregularly serrate.
Epiphytic on tree trunks in mountain forests, lithophytic on damp
rocks in mountain valleys; 600–1700 m. C and N Guangxi, SW Guizhou,
S Hunan, S Yunnan [Thailand, N Vietnam].
H. P. Wood (Dendrobiums, 640. 2006) tentatively placed Dendrobium
henryi in D. sect. Holochrysa.
5. Dendrobium sect. Distichophylla J. D. Hooker, Fl. Brit. India 5: 711. 1890 [“Distichophyllae”].
心叶组 xin ye zu
Roots smooth. Stem evenly swollen, cylindric, leafy, usually tall, in some species deciduous. Leaves closely spaced, distichous,
in 2 rows, usually short, stiffly textured, base cordate, clasping, and decurrent into sheaths. Inflorescences borne at each node on
recent and older leafy stems, 1- to several flowered. Flowers solitary, leaf opposed, resupinate or not resupinate, usually white, medium-sized,
shortly pedicellate. Sepals and petals sometimes reflexed; mentum straight, narrowly saccate, its elements fused distally
into a spur.
About 30 species: Himalayas to Oceania, most in Indonesia; one species in China.
52. Dendrobium ellipsophyllum Tang & F. T. Wang, Acta
Phytotax. Sin. 1: 81. 1951.
反瓣石斛 fan ban shi hu
Distichorchis ellipsophylla (Tang & F. T. Wang) M. A.
Clements.
Stems erect or ascending, cylindric, ca. 50 cm, ca. 5 mm in
diam., uniformly thick, with longitudinal ribs, unbranched, with
many nodes, internodes ca. 2 cm, enclosed in leaf sheaths.
Leaves alternate and dense along whole stem, elliptic, 4–5 ×
1.5–1.9(or more) cm, base cordate, clasping and decurrent into
sheaths tightly embracing stem, apex obtuse and unequally 2lobed.
Inflorescences many, (apparently) leaf-opposed, 1-flowered;
floral bracts small. Pedicel and ovary bent downward, ca.
2 cm, slender. Flowers scented, white, disk yellow above mid-
dle, keels brownish purple. Dorsal sepal reflexed, ovate-oblong,
ca. 8 × 5 mm, apex acute; lateral sepals reflexed, oblong-lanceolate,
ca. 8 × 5 mm, apex acute; mentum angulate, ca. 7 mm.
Petals recurved, narrowly lanceolate, ca. 7 × 4 mm, apex acute;
lip larger than sepals, fleshy, 3-lobed, ± decurved and folded
along axis; lateral lobes deltoid, small, ca. 2 mm, acute; midlobe
nearly transversely oblong or rounded, somewhat large, ca.
10 × 15 mm, subtruncate and broadly emarginate, central part
of disk with 3 keeled ridges.
Epiphytic on tree trunks in broad-leaved mountain forests; ca.
1100 m. SE Yunnan (Menghai, Mengla) [Cambodia, Laos, Myanmar,
Thailand, Vietnam].
This species was misidentified by Z. H. Tsi (Acta Phytotax. Sin.
18: 434. 1980) as Dendrobium revolutum Lindley.
6. Dendrobium sect. Breviflora J. D. Hooker, Fl. Brit. India 5: 711. 1890 [“Breviflores”].
瘦轴组 shou zhou zu
Roots smooth. Stem erect or pendulous, tall, slender or slightly swollen, leafy, semideciduous, sometimes growing for 2 years.
Inflorescences lateral, short, often distal, pendulous, borne on bare penultimate leads, few flowered, flowers sometimes clustered;
peduncle and rachis thin and rigid. Flowers small, pink, white, or brownish. Mentum saccate, with an expanded cavity. Lip concave,
cymbiform, entire, interior often shortly hairy.