黑毛石斛 Dendrobium williamsonii
中文名（Chinese Name）：黑毛石斛
学名（Scientific Name）：Dendrobium williamsonii Day et Rchb. f.
英文名（English Common Name）：
别名（Chinese Common Name）：
异名（Synonym）：Callista williamsonii (Day & Rchb.f.) Kuntze
科属（Family & Genus）：兰科（Orchidaceae）石斛属
形态特征（Description）：茎圆柱形，有时肿大呈纺锤形，长达20厘米，粗4-6毫米，不分枝，具数节，节间长2-3厘米，干后金黄色。叶数枚，通常互生于茎的上部，革质，长圆形，长7-9.5厘米，宽1-2厘米，先端钝并且不等侧2裂，基部下延为抱茎的鞘，密被黑色粗毛，尤其叶鞘。总状花序出自具叶的茎端，具1-2朵花；花序柄长5-10毫米，基部被3-4枚短的鞘；花苞片纸质，卵形，长约5毫米，先端急尖；花开展，萼片和花瓣淡黄色或白色，相似，近等大，狭卵状长圆形，长2.5-3.4厘米，宽6-9毫米，先端渐尖，具5条脉；中萼片的中肋在背面具矮的狭翅；侧萼片与中萼片近等大，但基部歪斜，具5条脉，在背面的中肋具矮的狭翅；萼囊劲直，角状，长1.5-2厘米；唇瓣淡黄色或白色，带橘红色的唇盘，长约2.5厘米，3裂；侧裂片围抱蕊柱，近倒卵形，前端边缘稍波状；中裂片近圆形或宽椭圆形，先端锐尖，边缘波状；唇盘沿脉纹疏生粗短的流苏；蕊柱长约6毫米；药帽短圆锥形，前端边缘密生短髯毛。花期4-5月。
分布（Distribution）：产海南、广西、云南等地。生于海拔约1000米的林中树干上。印度、缅甸、越南也有。
用途（Use）：
引自中国植物志英文版：FOC Vol. 25 Page 369, 393
Dendrobium williamsonii J. Day & H. G. Reichenbach, Gard. Chron. 1869: 78. 1869.
黑毛石斛 hei mao shi hu| Orchidaceae | Dendrobium
Callista williamsonii (J. Day & H. G. Reichenbach) Kuntze.
Stems cylindric, sometimes swollen and fusiform, to 20 cm, 4-6 mm in diam., unbranched, with several nodes, internodes 2-3 cm, golden yellow when dry. Leaves several, usually alternate on upper part of stem, oblong, 7-9.5 × 1-2 cm, leathery, with dense black rigid hairs especially on sheaths, base decurrent forming clasping sheaths, apex obtuse and unequally bilobed. Inflorescences subterminal, 1- or 2-flowered; peduncle 5-10 mm; basal sheaths 3 or 4, short; floral bracts ovate, ca. 5 mm, papery, acute; ovary not carinate. Flowers spreading; sepals and petals pale yellow or white, lip pale yellow or white, disk tinged with tangerine. Dorsal sepal narrowly ovate-oblong, 25-34 × 6-9(or more) mm, narrowly keeled abaxially, 5-veined, acuminate; lateral sepals similar to dorsal sepal but oblique at base, 5-veined; mentum rigid, straight, 15-20 mm, forming spur. Petals similar to sepals; lip ca. 2.5 cm, 3-lobed; lateral lobes embracing column, subobovate, front margin slightly undulate; mid-lobe suborbicular or broadly elliptic, margin undulate, apex acute; disk sparsely shortly fimbriate along veins. Column ca. 6 mm; anther cap broadly conic, front margin densely shortly barbate.
Epiphytic on tree trunks in forests; ca. 1000 m. N Guangxi, Hainan (Wuzhi Shan), SE and W Yunnan [NE India, Myanmar, Vietnam].
（责任编辑：徐晔春）
学名（Scientific Name）：Dendrobium williamsonii Day et Rchb. f.
英文名（English Common Name）：
别名（Chinese Common Name）：
异名（Synonym）：Callista williamsonii (Day & Rchb.f.) Kuntze
科属（Family & Genus）：兰科（Orchidaceae）石斛属
形态特征（Description）：茎圆柱形，有时肿大呈纺锤形，长达20厘米，粗4-6毫米，不分枝，具数节，节间长2-3厘米，干后金黄色。叶数枚，通常互生于茎的上部，革质，长圆形，长7-9.5厘米，宽1-2厘米，先端钝并且不等侧2裂，基部下延为抱茎的鞘，密被黑色粗毛，尤其叶鞘。总状花序出自具叶的茎端，具1-2朵花；花序柄长5-10毫米，基部被3-4枚短的鞘；花苞片纸质，卵形，长约5毫米，先端急尖；花开展，萼片和花瓣淡黄色或白色，相似，近等大，狭卵状长圆形，长2.5-3.4厘米，宽6-9毫米，先端渐尖，具5条脉；中萼片的中肋在背面具矮的狭翅；侧萼片与中萼片近等大，但基部歪斜，具5条脉，在背面的中肋具矮的狭翅；萼囊劲直，角状，长1.5-2厘米；唇瓣淡黄色或白色，带橘红色的唇盘，长约2.5厘米，3裂；侧裂片围抱蕊柱，近倒卵形，前端边缘稍波状；中裂片近圆形或宽椭圆形，先端锐尖，边缘波状；唇盘沿脉纹疏生粗短的流苏；蕊柱长约6毫米；药帽短圆锥形，前端边缘密生短髯毛。花期4-5月。
分布（Distribution）：产海南、广西、云南等地。生于海拔约1000米的林中树干上。印度、缅甸、越南也有。
用途（Use）：
引自中国植物志英文版：FOC Vol. 25 Page 369, 393
Dendrobium williamsonii J. Day & H. G. Reichenbach, Gard. Chron. 1869: 78. 1869.
黑毛石斛 hei mao shi hu| Orchidaceae | Dendrobium
Callista williamsonii (J. Day & H. G. Reichenbach) Kuntze.
Stems cylindric, sometimes swollen and fusiform, to 20 cm, 4-6 mm in diam., unbranched, with several nodes, internodes 2-3 cm, golden yellow when dry. Leaves several, usually alternate on upper part of stem, oblong, 7-9.5 × 1-2 cm, leathery, with dense black rigid hairs especially on sheaths, base decurrent forming clasping sheaths, apex obtuse and unequally bilobed. Inflorescences subterminal, 1- or 2-flowered; peduncle 5-10 mm; basal sheaths 3 or 4, short; floral bracts ovate, ca. 5 mm, papery, acute; ovary not carinate. Flowers spreading; sepals and petals pale yellow or white, lip pale yellow or white, disk tinged with tangerine. Dorsal sepal narrowly ovate-oblong, 25-34 × 6-9(or more) mm, narrowly keeled abaxially, 5-veined, acuminate; lateral sepals similar to dorsal sepal but oblique at base, 5-veined; mentum rigid, straight, 15-20 mm, forming spur. Petals similar to sepals; lip ca. 2.5 cm, 3-lobed; lateral lobes embracing column, subobovate, front margin slightly undulate; mid-lobe suborbicular or broadly elliptic, margin undulate, apex acute; disk sparsely shortly fimbriate along veins. Column ca. 6 mm; anther cap broadly conic, front margin densely shortly barbate.
Epiphytic on tree trunks in forests; ca. 1000 m. N Guangxi, Hainan (Wuzhi Shan), SE and W Yunnan [NE India, Myanmar, Vietnam].
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