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鼓槌石斛 Dendrobium chrysotoxum

时间:2013-10-23 18:47来源:未知 作者:徐晔春 点击:
中文名 ( Chinese Name ): 鼓槌石斛 学名 ( Scientific Name ): Dendrobium chrysotoxum Lindl. 英文名 ( English Common Name ): 别名 ( Chinese Common Name ): 异名 ( Synonym ): Dendrobium suavissimum Rchb. f. Dendrobium chrysotoxum
中文名Chinese Name):鼓槌石斛
学名Scientific Name):Dendrobium chrysotoxum Lindl.
英文名English Common Name):
别名Chinese Common Name):
异名Synonym):Dendrobium suavissimum Rchb. f.  Dendrobium chrysotoxum var. suavissimum (Rchb. f.) Hook. f. et Veitch  Callista suavissima (Rchb.f.) Kuntze  Dendrobium chrysotoxum var. delacourii Gagnep.
科属(Family & Genus):兰科(Orchidaceae)石斛属
形态特征(Description):茎直立,肉质,纺锤形,长6-30厘米,中部粗1.5-5厘米,具2-5节间,具多数圆钝的条棱,干后金黄色,近顶端具2-5枚叶。叶革质,长圆形,长达19厘米,宽2-3.5厘米或更宽,先端急尖而钩转,基部收狭,但不下延为抱茎的鞘。总状花序近茎顶端发出,斜出或稍下垂,长达20厘米;花序轴粗壮,疏生多数花;花序柄基部具4-5枚鞘;花苞片小,膜质,卵状披针形,长2-3毫米,先端急尖;花梗和子房黄色,长达5厘米;花质地厚,金黄色,稍带香气;中萼片长圆形,长1.2-2厘米,中部宽5-9毫米,先端稍钝,具7条脉;侧萼片与中萼片近等大;萼囊近球形,宽约4毫米;花瓣倒卵形,等长于中萼片,宽约为萼片的2倍,先端近圆形,具约10条脉;唇瓣的颜色比萼片和花瓣深,近肾状圆形,长约2厘米,宽2.3厘米,先端浅2裂,基部两侧多少具红色条纹,边缘波状,上面密被短绒毛;唇盘通常呈“∧”隆起,有时具“U”形的栗色斑块;蕊柱长约5毫米;药帽淡黄色,尖塔状。花期3-5月。
分布(Distribution):产云南,生于海拔520~1620米阳光充足的常绿阔叶林中树干上或疏林下的岩石上,东南亚也有。
用途(Use):
引自中国植物志英文版:FOC Vol. 25 Page 369, 375   
Dendrobium chrysotoxum Lindley, Edwards’s Bot. Reg. 33: ad t. 19. 1847.
鼓槌石斛 gu chui shi hu| Orchidaceae  | Dendrobium
Callista chrysotoxa (Lindley) Kuntze; Dendrobium chrysotoxum var. delacourii Gagnepain.
Stem pseudobulbous, erect, fusiform, 6-30 cm, 1.5-5 cm in diam. at middle, with 2-5 internodes, with many bluntly rounded ridges, golden yellow when dry. Leaves 2-5, subterminal, oblong, to 19 × 2-3.5 cm or wider, leathery, base contracted, not decurrent into clasping sheaths, apex acute and hooked. Inflorescence subterminal, ascending or slightly pendulous, to 20 cm, laxly many flowered; peduncle and rachis stout, basal sheaths 4 or 5; floral bracts ovate-lanceolate, 2-3 mm, membranous, apex acute. Pedicel and ovary to 5 cm. Flowers slightly fragrant, thickly textured, golden yellow, lip deeper golden yellow with red stripes on each side at base, anther cap pale yellow. Dorsal sepal oblong, 12-20 mm, 5-9 mm wide at middle, 7-veined, slightly obtuse; lateral sepals nearly equal to dorsal sepal; mentum subglobose, ca. 4 mm wide. Petals oblanceolate, ca. as long as dorsal sepal, ca. 2 × as wide as sepals, ca. 10-veined, margin minutely dentate, apex rounded; lip nearly reniform-orbicular, ca. 20 × 23 mm, adaxially densely pubescent, margin undulate, apex shallowly bilobed; disk often V-shaped, raised, sometimes with U-shaped chestnut spots. Column ca. 5 mm; anther cap tower-shaped.
Epiphytic on tree trunks in sunny evergreen broad-leaved forests, lithophytic on rocks in open forests; 500-1600 m. S and W Yunnan [NE India, Laos, Myanmar, Thailand, Vietnam].




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