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钩状石斛 Dendrobium aduncum

时间:2013-10-23 18:34来源:未知 作者:徐晔春 点击:
中文名( Chinese Name ):钩状石斛 学名( Scientific Name ): Dendrobium aduncum Lindl. 英文名( English Common Name ): 别名( Chinese Common Name ): 异名( Synonym ): Dendrobium faulhaberianum Schltr. Dendrobium aduncum var. faulha
中文名(Chinese Name):钩状石斛
学名(Scientific Name):Dendrobium aduncum Lindl.
英文名(English Common Name):
别名(Chinese Common Name):
异名(Synonym):Dendrobium faulhaberianum Schltr.  Dendrobium aduncum var. faulhaberianum (Schltr.) T. Tang et F. T. Wang  Callista adunca (Lindl.) Kuntze  Dendrobium oxyanthum Gagnep.
科属(Family & Genus):兰科(Orchidaceae)石斛属
形态特征(Description):茎下垂,圆柱形,长50-100厘米,粗2-5毫米,有时上部多少弯曲,不分枝,具多个节,节间长3-3.5厘米,干后淡黄色。叶长圆形或狭椭圆形,长7-10.5厘米,宽1-3.5厘米,先端急尖并且钩转,基部具抱茎的鞘。总状花序通常数个,出自落了叶或具叶的老茎上部,花序轴纤细,长1.5-4厘米,多少回折状弯曲,疏生1-6朵花;花序柄长5-10毫米,基部被3-4枚长2-3毫米的膜质鞘;花苞片膜质,卵状披针形,长5-7毫米,先端急尖;花梗和子房长约1.5厘米;花开展,萼片和花瓣淡粉红色;中萼片长圆状披针形,长1.6-2厘米,宽7毫米,先端锐尖,具5条脉;侧萼片斜卵状三角形,与中萼片等长而宽得多,先端急尖,具5条脉,基部歪斜;萼囊明显坛状,长约1厘米;花瓣长圆形,长1.4-1.8厘米,宽7毫米,先端急尖,具5条脉;唇瓣白色,朝上,凹陷呈舟状,展开时为宽卵形,长1.5-1.7厘米,前部骤然收狭而先端为短尾状并且反卷,基部具长约5毫米的爪,上面除爪和唇盘两侧外密布白色短毛,近基部具1个绿色方形的胼胝体;蕊柱白色,长约4毫米,下部扩大,顶端两侧具耳状的蕊柱齿,正面密布紫色长毛;蕊柱足长而宽,长约1厘米,向前弯曲,末端与唇瓣相连接处具1个关节,内面有时疏生毛;药帽深紫色,近半球形,密布乳突状毛,顶端稍凹的,前端边缘具不整齐的齿。花期5-6月。
分布(Distribution):产湖南、广东、香港、海南、广西、贵州、云南等地,生于海拔700~1000米的山地林中树干上,东南亚也有。
用途(Use):
引自中国植物志英文版:FOC Vol. 25 Page 370, 389   
Dendrobium aduncum Wallich ex Lindley, Edwards’s Bot. Reg. 28(Misc.): 58. 1842.
钩状石斛 gou zhuang shi hu| Orchidaceae  | Dendrobium
Callista adunca (Wallich ex Lindley) Kuntze; Dendrobium aduncum var. faulhaberianum (Schlechter) Tang & F. T. Wang; D. faulhaberianum Schlechter.
Stems pendulous, sometimes upper part ± curved, pale yellow when dry, cylindric, 50-100 cm, 2-5 mm in diam., unbranched, with many nodes, internodes 3-3.5 cm. Leaves oblong or narrowly elliptic, 7-10.5 × 1-3.5 cm, with clasping sheaths at base, apex acute. Inflorescences often several, arising from upper part of deciduous or leafy old stem; rachis ± porrect, 1.5-4 cm, slender, sparsely 1-6-flowered; peduncle 5-10 mm, base with 3 or 4 membranous sheaths 2-3 mm; floral bracts ovate-lanceolate, 5-7 mm, membranous, acute. Pedicel and ovary ca. 1.5 cm. Flowers spreading; sepals and petals pale pink, lip white, callus green, column white, anther cap deep purple. Dorsal sepal oblong-lanceolate, 16-20 × ca. 7 mm, 5-veined, apex acute; lateral sepals obliquely ovate-triangular, ca. as long as or slightly broader than dorsal sepal, 5-veined, apex acute; mentum jarlike, ca. 1 cm. Petals oblong, 14-18 × ca. 7 mm, 5-veined, apex acute; lip concave, cymbiform, broadly ovate when spread, 15-17 mm, claw ca. 5 mm, adaxially densely white barbellate except for claw and both sides of disk, with a square callus near base, apex abruptly contracted, recurved-caudate. Column ca. 4 mm, lower part enlarged, apex with auriculate column teeth on both sides, front densely purple crinite, foot ca. 1 cm long and wide, bent forward, inner surface sometimes sparsely hairy; anther cap nearly subglobose, densely papillate-hairy, front margin irregularly dentate, apex slightly concave.
Epiphytic on tree trunks in mountain forests; 700-1000 m. Guangdong, Guangxi, SW Guizhou, SE Hainan, NE Hunan (Taoyuan), SE Yunnan (Maguan) [Bhutan, NE India, Myanmar, Thailand, Vietnam].




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