ORCHIDACEAE - China

388EPIDENDROIDEAEoblique; 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, adaxiallydensely barbellate, margin erose, apex emarginate. Columnvery short, ca. 5 mm, foot ca. 4 mm; anther cap conic, denselyfinely papillate, front margin irregularly dentate, apex obtuse.Capsule narrowly cylindric, 6–7 × 0.5–0.6 cm, with a stalk ca. 1cm.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 (OrchidsChina, 156. 1998) as Dendrobium moulmeinense (a synonym ofD. devonianum in the present treatment).51. Dendrobium henryi Schlechter, Repert. Spec. Nov. RegniVeg. 17: 67. 1921.疏 花 石 斛 shu hua shi huDendrobium daoense Gagnepain; D. evaginatum Gagnepain;Grastidium daoense (Gagnepain) Rauschert.Stems ascending or pendulous, cylindric, 30–80 cm, 5–8mm in diam., unbranched, with many nodes, internodes 3–4.5cm, pale yellow when dry. Leaves oblong or oblong-lanceolate,8.5–11 × 1.7–3 cm, leathery, base contracted and dilated intosheaths, apex acuminate or acute; leaf sheath tightly embracingstem, papery, sheath mouth often open when dry. Inflorescenceon middle part of old leafy or leafless stems, 1- or 2-flowered;peduncle nearly perpendicular to stem, 1.5–2.5 cm; basalsheaths 3 or 4, tubular, 2–3 mm, membranous; floral bractsovate-triangular, 6–9 mm, papery, apex obtuse. Pedicel andovary 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 sepalsovate-lanceolate, 23–30 × 10–12(or more) mm, apex acuminate;mentum broadly conic, ca. 5 mm, apex rounded. Petalsslightly obliquely broadly ovate, slightly shorter than sepal, butrelatively wide, 7-veined, with many secondary veins, baseshortly clawed, apex acute; lip suborbicular, 2–3 cm, base witha claw ca. 3 mm, both sides embracing column, margin irregularlydenticulate; disk concave, densely finely papillate. Columnca. 3 mm; anther cap conic, ca. 2 mm, densely finelypapillate, front margin ± irregularly serrate.Epiphytic on tree trunks in mountain forests, lithophytic on damprocks 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 Dendrobiumhenryi in D. sect. Holochrysa.5. Dendrobium sect. Distichophylla J. D. Hooker, Fl. Brit. India 5: 711. 1890 [“Distichophyllae”].心 叶 组 xin ye zuRoots 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 onrecent 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 distallyinto a spur.About 30 species: Himalayas to Oceania, most in Indonesia; one species in China.52. Dendrobium ellipsophyllum Tang & F. T. Wang, ActaPhytotax. Sin. 1: 81. 1951.反 瓣 石 斛 fan ban shi huDistichorchis ellipsophylla (Tang & F. T. Wang) M. A.Clements.Stems erect or ascending, cylindric, ca. 50 cm, ca. 5 mm indiam., uniformly thick, with longitudinal ribs, unbranched, withmany 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 intosheaths tightly embracing stem, apex obtuse and unequally 2-lobed. 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 middle,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 foldedalong axis; lateral lobes deltoid, small, ca. 2 mm, acute; midlobenearly transversely oblong or rounded, somewhat large, ca.10 × 15 mm, subtruncate and broadly emarginate, central partof 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 zuRoots 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.