大苞鞘石斛 Dendrobium wardianum

中文名(Chinese Name):大苞鞘石斛
学名(Scientific Name):Dendrobium wardianum Warner
英文名(English Common Name):
别名(Chinese Common Name):腾冲石斛
异名(Synonym):Callista wardiana (R.Warner) Kuntze  Dendrobium wardianum var. pictum O'Brien  Dendrobium wardianum candidum Rchb.f.
科属(Family & Genus):兰科(Orchidaceae)石斛属
形态特征(Description):茎斜立或下垂,肉质状肥厚,圆柱形,通常长16-46厘米,粗7-15毫米,不分枝,具多节;节间多少肿胀呈棒状,长2-4厘米,干后琉黄色带污黑。叶薄革质,二列,狭长圆形,长5.5-15厘米,宽1.7-2厘米,先端急尖,基部具鞘;叶鞘紧抱于茎,干后鞘口常张开。总状花序从落了叶的老茎中部以上部分发出,具1-3朵花;花序柄粗短,长2-5毫米,基部具3-4枚宽卵形的鞘;花苞片纸质,大型,宽卵形,长2-3厘米,宽1.5厘米,先端近圆形;花梗和子房白色带淡紫红色,长约5毫米;花大,开展,白色带紫色先端;中萼片长圆形,长4.5厘米,宽1.8厘米,先端钝,具8-9条主脉和许多近横生的支脉;侧萼片与中萼片近等大,先端钝,基部稍歪斜,具8-9条主脉和许多近横生的支脉;萼囊近球形,长约5毫米;花瓣宽长圆形,与中萼片等长而较宽,达2.8厘米,先端钝,基部具短爪,具5条主脉和许多支脉;唇瓣白色带紫色先端,宽卵形,长约3.5厘米,宽3.2厘米,中部以下两侧围抱蕊柱,先端圆形,基部金黄色并且具短爪,两面密布短毛,唇盘两侧各具1个暗紫色斑块;蕊柱长约5毫米,基部扩大;药帽宽圆锥形,无毛,前端边缘具不整齐的齿。花期3-5月。
分布(Distribution):产云南。生于海拔1350~1900米的山地疏林中树干上。东南亚也有。
用途(Use):
引自中国植物志英文版:FOC Vol. 25 Page 371, 377   
Dendrobium wardianum Warner, Select Orchid. Pl. 1: t. 19. 1862.
大苞鞘石斛 da bao qiao shi hu| Orchidaceae  | Dendrobium
Callista wardiana (Warner) Kuntze.
Stems pendulous, cylindric, 11-50 cm, 5-10 mm or more in diam., fleshy, with many swollen nodes, upper part ± upcurved, internodes 2-2.5 cm, pale yellow when dry. Leaves oblong, 8-11 × 1.5-1.8(or more) cm, leathery, base with clasping sheath, apex slightly obtuse and hooked on one side; leaf sheath papery when dry, sheath mouth open cupular. Inflorescence on old leafless stems, 1- or 2-flowered; peduncle 3-5 mm; basal sheaths 2 or 3, pale white when dry, broadly ovate, 3-5 mm, papery, obtuse; floral bracts broadly ovate, 7-10 mm, papery, apex obtuse. Pedicel and ovary pale purple, ca. 2 cm. Flowers fragrant, spreading, papery; sepals and petals white with pale purple tips, lip with many purplish red stripes on each side, disk with a pale yellow transverse semilunar central blotch, column white, front side with purple stripes, anther cap white. Dorsal sepal ovate-lanceolate, 23-25 × 7-8(or more) mm, 7-veined, apex acute or slightly obtuse; lateral sepals suborbicular, equal in size, 7-veined, base oblique, apex acute; mentum subglobose, small, ca. 3 mm. Petals obliquely ovate, 23-25 × 13-14 mm, main veins 5, secondary veins many, base contracted into a short claw, margin entire, apex obtuse; lip nearly broadly obovate, ca. 23 × 20 mm, adaxially densely barbellate, base cuneate, margin ciliate, apex rounded. Column ca. 4 mm; anther cap subconic, densely finely papillate, front margin irregularly dentate. Capsule ovoid, ca. 3 × 1.3-1.6 cm.
Epiphytic on tree trunks in open forests; 1300-1900 m. SE to W Yunnan [?Bhutan, NE India, Myanmar, N Thailand, N Vietnam].
 大苞鞘石斛 Dendrobium wardianum

大苞鞘石斛 Dendrobium wardianum

大苞鞘石斛 Dendrobium wardianum
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