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齿瓣石斛Dendrobium devonianum

时间:2013-10-23 18:52来源:未知 作者:徐晔春 点击:
中文名( Chinese Name ):齿瓣石斛 学名( Scientific Name ): Dendrobium devonianum Paxt. 英文名( English Common Name ): 别名( Chinese Common Name ): 异名( Synonym ): Callista devoniana (Paxton) Kuntze Callista moulmeinensis (C.S
中文名(Chinese Name):齿瓣石斛
学名(Scientific Name):Dendrobium devonianum Paxt.
英文名(English Common Name):
别名(Chinese Common Name):
异名(Synonym):Callista devoniana (Paxton) Kuntze  Callista moulmeinensis (C.S.P.Parish ex Hook.f.) Kuntze  Dendrobium devonianum var. rhodoneurum Rchb.f.  Dendrobium pulchellum var. devonianum (Paxton) Rchb.f.  Dendrobium devonianum var. elliottianum Rchb.f.  Dendrobium devonianum var. candidulum Rchb.f.
科属Family & Genus):兰科(Orchidaceae)石斛属
形态特征Description):茎下垂,稍肉质,细圆柱形,长50-70 (-100) 厘米,粗3-5毫米,不分枝,具多数节,节间长2.5-4厘米,干后常淡褐色带污黑。叶纸质,二列互生于整个茎上,狭卵状披针形,长8-13厘米,宽1.2-2.5厘米,先端长渐尖,基部具抱茎的鞘;叶鞘常具紫红色斑点,干后纸质。总状花序常数个,出自于落了叶的老茎上,每个具1-2朵花;花序柄绿色,长约4毫米,基部具2-3枚干膜质的鞘;花苞片膜质,卵形,长约4毫米,先端近锐尖;花梗和子房绿色带褐色,长2-2.5厘米;花质地薄,开展,具香气;中萼片白色,上部具紫红色晕,卵状披针形,长约2.5厘米,宽9毫米,先端急尖,具5条紫色的脉;侧萼片与中萼片同色,相似而等大,但基部稍歪斜;萼囊近球形,长约4毫米;花瓣与萼片同色,卵形,长2.6厘米,宽1.3厘米,先端近急尖,基部收狭为短爪,边缘具短流苏,具3条脉,其两侧的主脉多分枝;唇瓣白色,前部紫红色,中部以下两侧具紫红色条纹,近圆形,长3厘米,基部收狭为短爪,边缘具复式流苏,上面密布短毛;唇盘两侧各具1个黄色斑块;蕊柱白色,长约3毫米,前面两侧具紫红色条纹;药帽白色,近圆锥形,顶端稍凹的,密布细乳突,前端边缘具不整齐的齿。花期4-5月。
分布(Distribution):产广西、贵州、云南及西藏等地,生于海拔达1850米的山地密林中树干上。东南亚也有。
用途(Use):
引自中国植物志英文版:FOC Vol. 25 Page 372, 379,388
Dendrobium devonianum Paxton, Paxton’s Mag. Bot. 7: 169. 1840.
齿瓣石斛 chi ban shi hu | Orchidaceae  | Dendrobium
Callista devoniana (Paxton) Kuntze; C. moulmeinensis (E. C. Parish ex J. D. Hooker) Kuntze; Dendrobium devonianum var. rhodoneurum H. G. Reichenbach; D. moulmeinense E. C. Parish ex J. D. Hooker; D. pulchellum Roxburgh ex Lindley var. devonianum (Paxton) H. G. Reichenbach.
Stems pendulous, cylindric, 50-70(-100) cm, slender, 3-5 mm in diam., slightly fleshy, unbranched, with many nodes, internodes 2.5-4 cm, often pale brown tinged with dirty black when dry. Leaves narrowly ovate-lanceolate, 8-13 × 1.2-2.5 cm, leathery, base with clasping sheath, apex long acuminate; leaf sheath often with purplish red dots, papery when dry. Inflorescences often several, on old leafless stems, 1- or 2-flowered; peduncle green, ca. 4 mm; basal sheaths 2 or 3, dry, membranous; floral bracts ovate, ca. 4 mm, membranous, apex subacute. Pedicel and ovary green, tinged with brown, 2-2.5 cm. Flowers scented, spreading, thinly textured; dorsal sepal white, upper part tinged with purplish red, veins purple, lip white, front purplish red, with purplish red stripes on both sides below middle, disk with a yellow spot on either side, column white, both front sides with purple stripes, anther cap white. Dorsal sepal ovate-lanceolate, ca. 25 × 9 mm, 5-veined, apex acute; lateral sepals similar in size and shape, but base slightly oblique; mentum subglobose, ca. 4 mm. Petals ovate, ca. 26 × 13 mm, 3-veined, lateral main veins often branched, base shortly clawed, margin shortly fimbriate, apex subacute; lip suborbicular, ca. 3 cm, base shortly clawed, margin compound fimbriate, adaxially densely barbellate. Column ca. 3 mm; anther cap subconic, densely finely papillate, front margin irregularly dentate, apex slightly concave.
Epiphytic on tree trunks in thick mountain forests; ca. 1900 m. NW Guangxi (Longlin), SW Guizhou (Luodian, Xingyi), SE Xizang (Mêdog), SE to W Yunnan [Bhutan, NE India, Myanmar, N Thailand, Vietnam].


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