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束花石斛 Dendrobium chrysanthum

时间:2013-10-23 18:45来源:未知 作者:徐晔春 点击:
中文名( Chinese Name ):束花石斛 学名( Scientific Name ): Dendrobium chrysanthum Lindl. 英文名( English Common Name ): 别名( Chinese Common Name ): 异名( Synonym ): Dendrobium ochreatum Lindl.:Z. H. Tsi et S. C. Chen Callista
中文名(Chinese Name):束花石斛
学名(Scientific Name):Dendrobium chrysanthum Lindl.
英文名(English Common Name):
别名(Chinese Common Name):
异名(Synonym):Dendrobium ochreatum Lindl.:Z. H. Tsi et S. C. Chen  Callista chrysantha (Wall. ex Lindl.) Kuntze  Dendrobium chrysanthum var. anophthalama Rchb.f.  Dendrobium chrysanthum var. microphthalama Rchb.f. 
科属(Family & Genus):兰科(Orchidaceae)石斛属
形态特征(Description):茎粗厚,肉质,下垂或弯垂,圆柱形,长50-200厘米,粗5-15毫米,上部有时稍回折状弯曲,不分枝,具多节,节间长3-4厘米,干后浅黄色或黄褐色。叶二列,互生于整个茎上,纸质,长圆状披针形,通常长13-19厘米,宽1.5-4.5厘米,先端渐尖,基部具鞘;叶鞘纸质,干后鞘口常杯状张开,常浅白色。伞状花序近无花序柄,每2-6花为一束,侧生于具叶的茎上部;花苞片膜质,卵状三角形,长约3毫米;花梗和子房稍扁,长3.5-6厘米,粗约2毫米;花黄色,质地厚;中萼片多少凹的,长圆形或椭圆形,长15-20毫米,宽9-11毫米,先端钝,具7条脉;侧萼片稍凹的斜卵状三角形,长15-20毫米,基部稍歪斜而较宽,宽约10-12毫米,先端钝,具7条脉;萼囊宽而钝,长约4毫米;花瓣稍凹的倒卵形,长16-22毫米,宽11-14毫米,先端圆形,全缘或有时具细啮蚀状,具7条脉;唇瓣凹的,不裂,肾形或横长圆形,长约18毫米,宽约22毫米,先端近圆形,基部具1个长圆形的胼胝体并且骤然收狭为短爪,上面密布短毛,下面除中部以下外亦密布短毛;唇盘两侧各具1个栗色斑块,具1条宽厚的脊从基部伸向中部;蕊柱长约4毫米,具长约6毫米的蕊柱足;药帽圆锥形,长约2.5毫米,几乎光滑的,前端边缘近全缘。蒴果长圆柱形,长7厘米,粗约1.5厘米。花期9-10月。
分布(Distribution):产广西、贵州、云南、西藏等地,生于海拔700~2500米的山地密林中树干上或山谷阴湿的岩石上。东南亚也有。
用途(Use):
引自中国植物志英文版:FOC Vol. 25 Page 371, 377   
Dendrobium chrysanthum Wallich ex Lindley, Edwards’s Bot. Reg. 15: ad t. 1299. 1829.
束花石斛 shu hua shi hu| Orchidaceae  | Dendrobium
Callista chrysantha (Wallich ex Lindley) Kuntze; Dendrobium chrysanthum var. anophthalma H. G. Reichenbach; D. chrysanthum var. microphthalma H. G. Reichenbach.
Stems pendulous or curving, cylindric, 50-200 cm, stout, 5-15 mm in diam., upper part sometimes upcurved, fleshy, unbranched, with many nodes, internodes 3-4 cm, pale yellow or yellowish brown when dry. Leaves distichous along entire stem, oblong-lanceolate, usually 13-19 × 1.5-4.5 cm, papery, base sheathing, apex acuminate; leaf sheath papery, sheath mouth often open cupular when dry, often pale white. Inflorescences (apparently) leaf-opposed, lateral, on upper part of mature leafy stems, fasciculate, almost sessile, 2-6-flowered; floral bracts ovate-triangular, ca. 3 mm, membranous. Pedicel and ovary slightly compressed, 3.5-6 cm, ca. 2 mm in diam. Flowers thickly textured, yellow, lip disk with a chestnut blotch on either side. Dorsal sepal ± concave, oblong or elliptic, 15-20 × 9-11(or more) mm, 7-veined, apex obtuse; lateral sepals slightly concave, obliquely ovate-triangular, 15-20 × 10-12 mm, 7-veined, base slightly oblique and broad, apex obtuse; mentum ca. 4 mm, broad and obtuse. Petals slightly concave, obovate, 16-22 × 11-14(or more) mm, 7-veined, margin entire or sometimes finely erose, apex rounded; lip concave, reniform or transversely oblong, ca. 18 × 22 mm, abaxially densely barbellate except for middle, adaxially densely barbellate, base abruptly contracted into short claw, with an oblong callus, margin entire, apex rounded; disk with a broad and thick ridge extending from base to middle. Column ca. 4 mm, foot ca. 6 mm; anther cap conic, ca. 2.5 mm, nearly glabrous, front margin nearly entire. Capsule elongate, cylindric, ca. 7 × 1.5 cm.
Epiphytic on tree trunks in dense forests, lithophytic on wet rocks in valleys; 700-2500 m. W Guangxi, S Guizhou, SE Xizang, S Yunnan [Bhutan, N India, Laos, Myanmar, Nepal, N Thailand, Vietnam].
Z. H. Tsi and S. C. Chen (Acta Phytotax. Sin. 33: 291. 1995) named Chinese material of this species as "Dendrobium ochreatum Lindley" (in Wallich, Numer. List, no. 7410. 1832), which is a nomen nudum and therefore was not validly published.




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