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反瓣石斛 Dendrobium ellipsophyllum

时间:2013-10-23 18:55来源:未知 作者:徐晔春 点击:
中文名 ( Chinese Name ): 反瓣石斛 学名 ( Scientific Name ): Dendrobium ellipsophyllum T. Tang et F. T. Wang 英文名 ( English Common Name ): 别名 ( Chinese Common Name ): 黄毛石斛 异名 ( Synonym ): Dendrobium revolutum Lindl.
中文名Chinese Name):反瓣石斛
学名Scientific Name):Dendrobium ellipsophyllum T. Tang et F. T. Wang
英文名English Common Name):
别名Chinese Common Name):黄毛石斛
异名Synonym):Dendrobium revolutum Lindl.:Z. H. Tsi  Distichorchis ellipsophylla (Tang & F.T.Wang) M.A.Clem.
科属(Family & Genus):兰科(Orchidaceae)石斛属
形态特征(Description):茎直立或斜立,圆柱形,长约50厘米,粗约5毫米,上下等粗,具纵条棱,不分枝,具多数节;节间长约2厘米,被叶鞘所包裹。叶二列,紧密互生于整个茎上,舌状披针形,长4-5厘米,宽15-19毫米,先端钝并且不等侧2裂,基部心形抱茎并且下延为紧抱于茎的鞘。花白色,常单朵从具叶的老茎上部发出,与叶对生,具香气;花苞片小;花梗连同子房纤细,下弯,长约2厘米;中萼片反卷,卵状长圆形,长约8毫米,宽约5毫米,先端急尖;侧萼片反卷,长圆状披针形,长8毫米,宽5毫米,先端急尖;萼囊角状,长约7毫米;花瓣反卷,狭披针形,长7毫米,宽约4毫米,先端急尖;唇瓣肉质,比萼片大,3裂,沿中轴线多少下弯而折叠;侧裂片小,三角形,长约2毫米,先端锐尖;中裂片较大,近横长圆形或圆形,长10毫米,宽约15毫米,先端近截形而具宽凹缺,唇盘中部以上黄色,中央具3条褐紫色的龙骨脊。花期6月。
分布(Distribution):产云南。生于海拔1100米的山地阔叶林中树干上。东南亚也有。
用途(Use):
引自中国植物志英文版:FOC Vol. 25 Page 369, 388   
Dendrobium ellipsophyllum Tang & F. T. Wang, Acta Phytotax. Sin. 1: 81. 1951.
反瓣石斛 fan ban shi hu| Orchidaceae  | Dendrobium
Distichorchis ellipsophylla (Tang & F. T. Wang) M. A. Clements.
Stems erect or ascending, cylindric, ca. 50 cm, ca. 5 mm in diam., uniformly thick, with longitudinal ribs, unbranched, with many 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 into sheaths 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 folded along axis; lateral lobes deltoid, small, ca. 2 mm, acute; mid-lobe nearly transversely oblong or rounded, somewhat large, ca. 10 × 15 mm, subtruncate and broadly emarginate, central part of 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.




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