ORCHIDACEAE - China

EPIDENDROIDEAE 391narrower, 3-veined, base contracted, apex acute; lip spatulate,15–22 × 7–8.5(or more) mm, base narrowly clawed, margin entire,apex slightly obtuse. Column ca. 2 mm, foot ca. 1 cm; anthercap conic, front margin finely papillate-hairy.200–400 m. S Taiwan (Lan Yu) [Philippines].Matsumura and Hayata (J. Coll. Sci. Imp. Univ. Tokyo 22: 408.1908) misidentified this species as Dendrobium hainanense Rolfe,belonging to section Strongyle.10. Dendrobium sect. Formosa (Bentham & J. D. Hooker) J. D. Hooker, Fl. Brit. India 5: 710. 1890 [“Formosae”].黑 毛 组 hei mao zuDendrobium ser. Formosa Bentham & J. D. Hooker, Gen. Pl. 3: 500. 1883 [“Formosae”].Roots smooth. Stems linear, mostly tall, stout, usually evergreen, new sheaths (and sometimes leaves) black- or brown hirsute,hairs deciduous when old. Flowers large, usually white, rarely yellow or with a contrasting lip. Mentum prominent, usually straight,conic, elements fused distally into a spur, nectar present in some species. Lip 3-lobed, crest usually finely hairy, often with multiplelow keels, blade glabrous.About 51 species: Himalayas to Indonesia and Philippines; eight species (one endemic) in China.Reviewer L. Averyanov notes that Dendrobium chapaense Averyanov (Rheedea 16: 3. 2006), described from N Vietnam, also occurs in China.However, the present authors could not substantiate this record because they found no relevant specimens.58. Dendrobium bellatulum Rolfe, J. Linn. Soc., Bot. 36: 10.1903.矮 石 斛 ai shi huStems erect or ascending, fusiform or shortly clavate, shortand stout, 2–5 cm, 3–18 mm in diam., with many longitudinalridges, unbranched, with 2–5 nodes, internodes 5–10 mm.Leaves 2–4, subterminal, ligulate, ovate-lanceolate, or oblong,1.5–4 × 1–1.3(or more) cm, leathery, both surfaces and leafsheaths densely shortly black hairy at least when young, basedecurrent forming clasping sheaths, apex obtuse and unequallybilobed. Inflorescences usually solitary, subterminal on latest orolder mature leads, 1–3-flowered; peduncle 2–3 mm; rachis 5–7mm; floral bracts ovate-lanceolate, 7–10 mm, membranous.Pedicel and ovary ca. 2.5 cm. Flowers spreading, white, midlobeof lip golden yellow, inner surface of lateral lobes red.Dorsal sepal ovate-lanceolate, ca. 25 × 10 mm, 7-veined, apexacute; lateral sepals obliquely ovate-lanceolate, ca. 25 × 10 mm,7- or 8-veined, apex acute; mentum broadly conic, ca. 10 mm.Petals oblanceolate, ca. as long as and wider than dorsal sepal,5-veined, rounded; lip subpandurate, ca. 30 mm, apex 3-lobed;lateral lobes nearly subovate; mid-lobe subreniform, shallowlybilobed, bent downward; disk irregularly papillate, with 5 irregularlypapillate ridges. Column ca. 5 mm; anther cap conic,densely papillate.Epiphytic on tree trunks in open forests; 1200–2100 m. S Yunnan[NE India, Laos, Myanmar, Thailand, Vietnam].59. Dendrobium christyanum H. G. Reichenbach, Gard.Chron., n.s., 1: 178. 1882.毛 鞘 石 斛 mao qiao shi huDendrobium margaritaceum Finet.Stems erect, subclavate to fusiform, 2–4[–8] cm, 6–9 mmin diam., unbranched, with few nodes. Leaves 2 or 3, subterminal,long-lasting, ovate-lanceolate or oblong, 3–4(–4.5) × ca. 1cm, abaxial surface and sheath with black hairs, apex obtuseand unequally 2-lobed. Inflorescences subterminal, 1- or 2-flowered. Flowers spreading, white, lip with orange center.Dorsal sepal ovate to ovate-lanceolate, ca. 20 × 8–10 mm,acute; lateral sepals similar to dorsal sepal; mentum broadlyconic, ca. 10 mm. Petals elliptic-oblong, ca. 20 mm, subacute;lip ca. 25 mm, margin undulate, apex 3-lobed; mid-lobe emarginateat apex; disk with 3 granulose lamellae.Epiphytic at forest margins; 800–1200 m. Yunnan [Thailand, Vietnam].The altitudinal range is based on records from Vietnam.The Chinese material has shorter and relatively broader stems thanmaterial from elsewhere.60. Dendrobium trigonopus H. G. Reichenbach, Gard. Chron.,ser. 3, 2: 682. 1887.翅 梗 石 斛 chi geng shi huCallista trogonopus (H. G. Reichenbach) Kuntze; Dendrobiumvelutinum Rolfe.Stems clustered, golden yellow when dry, fusiform orsometimes clavate, 5–11 cm, 12–15 mm in diam. at middle,thick and fleshy, unbranched, with 3–5 nodes, internodes ca. 2cm. Leaves 3 or 4, subterminal, oblong, 8–9.5 × 1.5–2.5(ormore) cm, thickly leathery, abaxially sparsely black hairyon midvein, midvein concave adaxially, with short claspingsheaths, apex acute. Inflorescences 1 or 2, distal on latest orolder mature leafy pseudobulbs, arcuate, 2- or 3-flowered; peduncle1–4 cm; floral bracts ovate-triangular, ca. 5 mm, fleshy,apex acute. Pedicel and ovary yellowish green, 3–4 cm; ovarytriquetrous. Flowers nodding, thick; sepals and petals waxy yellow,lip yellow, disk tinged with pale green. Dorsal and lateralsepals subsimilar, narrowly lanceolate, ca. 30 × 10 mm,strongly keeled, both margins ascending above middle, midveinon abaxial surface slightly raised and wing-shaped, apex acute;lateral sepals with base only partly adnate to column foot; mentumsubglobose, ca. 4 mm. Petals ovate-oblong, ca. 25 × 11mm, 8-veined, apex acute; lip erect, nearly parallel to column,ca. 25 mm, base shortly clawed, apex 3-lobed; lateral lobes embracingcolumn, subobovate, upper margin denticulate, apexrounded; mid-lobe orbicular, smaller than width between 2lateral lobe apices; disk densely papillose. Column ca. 6 mm,upper margin of teeth with several shallow indentations; anthercap conic, ca. 5 mm, glabrous.