织梦CMS - 轻松建站从此开始!

花卉图片网

当前位置: 主页 > 兰科植物 >

密花石斛 Dendrobium densiflorum

时间:2013-10-23 18:51来源:未知 作者:徐晔春 点击:
中文名( Chinese Name ):密花石斛 学名( Scientific Name ): Dendrobium densiflorum Lindl. 英文名( English Common Name ): 别名( Chinese Common Name ): 异名( Synonym ): Callista guibertii (Carrire) M.A.Clem. Callista clavata (Rox
中文名(Chinese Name):密花石斛
学名(Scientific Name):Dendrobium densiflorum Lindl.
英文名(English Common Name):
别名(Chinese Common Name):
异名(Synonym):Callista guibertii (Carrière) M.A.Clem.  Callista clavata (Roxb.) Kuntze  Callista densiflora (Lindl.) Kuntze  Dendrobium schroederi Dombrain  Dendrobium guibertii Carrière  Endeisa flava Raf.  Epidendrum dumunsuttu Buch.-Ham. ex Lindl.
科属(Family & Genus):兰科(Orchidaceae)石斛属
形态特征(Description):茎粗壮,通常棒状或纺锤形,长25-40厘米,粗达2厘米,下部常收狭为细圆柱形,不分枝,具数个节和4个纵棱,有时棱不明显,干后淡褐色并且带光泽;叶常3-4枚,近顶生,革质,长圆状披针形,长8-17厘米,宽2.6-6厘米,先端急尖,基部不下延为抱茎的鞘。总状花序从去年或2年生具叶的茎上端发出,下垂,密生许多花,花序柄基部被2-4枚鞘;花苞片纸质,倒卵形,长1.2-1.5厘米,宽6-10毫米,先端钝,具约10条脉,干后多少席卷;花梗和子房白绿色,长2-2.5厘米;花开展,萼片和花瓣淡黄色;中萼片卵形,长1.7-2.1厘米,宽8-12毫米,先端钝,具5条脉,全缘;侧萼片卵状披针形,近等大于中萼片,先端近急尖,具5-6条脉,全缘;萼囊近球形,宽约5毫米;花瓣近圆形,长1.5-2厘米,宽1.1-1.5厘米,基部收狭为短爪,中部以上边缘具啮齿,具3条主脉和许多支脉;唇瓣金黄色,圆状菱形,长1.7-2.2厘米,宽达2.2厘米,先端圆形,基部具短爪,中部以下两侧围抱蕊柱,上面和下面的中部以上密被短绒毛;蕊柱桔黄色,长约4毫米;药帽橘黄色,前后压扁的半球形或圆锥形,前端边缘截形,并且具细缺刻。花期4-5月。
分布(Distribution):产广东、海南、广西、西藏等地,生于海拔420~1000米的常绿阔叶林中树干上或山谷岩石上。东南亚也有。
用途(Use):
引自中国植物志英文版:FOC Vol. 25 Page 369, 375,376
Dendrobium densiflorum Wallich, Pl. Asiat. Rar. 1: 34. 1830.
密花石斛 mi hua shi hu| Orchidaceae  | Dendrobium
Callista densiflora (Wallich) Kuntze; Dendrobium clavatum Roxburgh (1832), not Wallich ex Lindley (1852).
Stems strongly clavate, swollen, ± pseudobulbous at base, 25-40 cm, to 2 cm in diam., internodes clavate, expanding to a swollen node, obscurely 4-angled, sometimes ridges inconspicuous, yellow, pale brown and glossy when dry, sheathless. Leaves 3 or 4, subterminal, oblong-lanceolate, 8-17 × 2.6-6 cm, leathery, base not decurrent into clasping sheath, apex acute. Inflorescence subterminal, pendulous, densely many flowered; peduncle with 2-4 sheaths at base; rachis 6-16 cm; floral bracts broadly oblong or obovate, 12-15 × 6-10(or more) mm, membranous, strongly ca. 10-veined, revolute, obtuse. Pedicel and ovary whitish green, 2-2.5 cm. Flowers spreading, 3-4 cm in diam.; sepals and petals pale yellow, lip golden yellow, column and anther cap orange-yellow. Dorsal sepal ovate, 17-21 × 8-12(or more) mm, 5-veined, obtuse; lateral sepals nearly as large as dorsal sepal, ovate-lanceolate, 5- or 6-veined, apex subacute; mentum subglobose, ca. 5 mm wide. Petals suborbicular, 15-20 × 11-15 mm, with 3 main veins and many secondary veins, base contracted into a short claw, margin erose above middle; lip orbicular-rhombic, 17-22 × up to 22 mm, both surfaces densely lanate above middle, shortly clawed, both sides embracing column below middle, apex rounded. Column ca. 4 mm; anther cap compressed subglobose or conic, front margin truncate, finely notched.
Epiphytic on tree trunks in evergreen broad-leaved forests, lithophytic on rocks in mountain valleys; 400-1000 m. N Guangdong, Guangxi, Hainan, SE Xizang [Bhutan, NE India, Myanmar, Nepal, N Thailand].
S. Y. Hu (Quart. J. Taiwan Mus. 26: 151. 1973) misidentified material of this species as Dendrobium amabile (Loureiro) O’Brien.
Seidenfaden (Opera Bot. 83: 23. 1985) included Dendrobium guibertii Carrière (Rev. Hort. 48: 431. 1876), from N Thailand, in the synonymy of D. densiflorum. However, H. P. Wood (Dendrobiums, 637-638. 2006) maintained it as a distinct, late-flowering (July-August) species, conceding that its true distribution remains unclear because of prevalent misidentification. A brief description is provided here for comparison with D. densiflorum. Stem clavate, to 80 cm, 4-grooved. Leaves 3-5, usually 4, ca. 10.5 × 5.5 cm. Inflorescence pendulous, 22-30 cm, developing very rapidly, with buds packed together, as in D. densiflorum, up to 60-flowered. Flowers ca. 4 cm in diam., sepals and petals pale yellow, lip deeper yellow.


(责任编辑:徐晔春)
顶一下
(2)
66.7%
踩一下
(1)
33.3%
------分隔线----------------------------
发表评论
请自觉遵守互联网相关的政策法规,严禁发布色情、暴力、反动的言论。
评价:
表情:
用户名: 验证码:点击我更换图片
栏目列表
推荐内容