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细枝杜鹃 xizhidujuan

被子植物门 Angiospermae
双子叶植物纲 Dicotyledoneae
合瓣花亚纲 Sympetalae
杜鹃花目 Ericales
杜鹃花科 Ericaceae
杜鹃属 Rhododendron
相关名称 Common Names
拉丁名
Rhododendron amandum Cowan
中文名
细枝杜鹃
拼音
xizhidujuan
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描述 Description

22.细枝杜鹃(西藏植物志)

Rhododendron amandum Cowan in Not. Bot. Gard. Edinb. 19: 245. 1937; Cullen in ibid. 39: 42. 1980; Davidian, Rhodod. Spec. 1: 98. 1982;西藏植物志3: 639. 1986.

灌木,高1.3-1.6米。幼枝被鳞片,通常无刚毛。叶革质,椭圆形或长圆状椭圆形,长5-8.5厘米,宽2-3.5厘米,顶端钝,具小短尖头,基部钝圆,边缘近基部有长缘毛后变无毛,上面无鳞片,沿中脉有长刚毛,其余无毛,下面密被鳞片,鳞片不等大,褐色,相距为其直径之半,无刚毛或中脉上稍有毛;叶柄长4-5毫米,密被鳞片和刚毛。花序顶生,伞形或短总状,有2-3花;花序轴长2-3毫米,有鳞片和密生短柔毛;花梗长0.6-1厘米,密生鳞片,无刚毛;花萼长约1厘米,5裂至基部,裂片红色,卵形或长圆状卵形,外面有鳞片,无刚毛,边缘密生缘毛,内面密被白色的毛;花冠漏斗状钟形,3-3.8厘米,淡黄色,外面散生鳞片,内、外面无毛,5裂;雄蕊10,不等长,长1.9-2.4厘米,比花冠短,花丝下部有疏密不一的短柔毛;子房5室,密 生鳞片,无毛,花柱细长,短于花冠,长于雄蕊,无鳞片,蒴果未见。

产西藏(隆子)。生于陡岩,杜鹃灌丛,海拔3 500米。模式标本采于西藏隆子县三安曲林区。

未见标本,描述参照了Cullen(1980)和Davidian(1982)的描述,两者的描述皆依据的是模式标本,看来本种的分布范围局限。

知识共享:署名-非商业性使用-禁止演绎 1999《中国植物志》第57(1)卷 039页 PDF

Shrubs, 1.3–1.6 m tall; young shoots scaly. Petiole 4–5 mm, densely scaly and hispid; leaf blade leathery, elliptic or oblong-elliptic, 5–8.5 × 2–3.5 cm; base blunt to rounded; apex obtuse, apiculate; abaxial surface scales ca. 0.5 × their own diameter apart, brown, midrib slightly hairy; adaxial surface without scales, midrib hispid. Inflorescence terminal, shortly racemose or cymose, 2- or 3-flowered; rachis 2–3 mm, scaly and densely pubescent. Pedicel 0.6–1 cm, densely scaly; calyx red, deeply 5-lobed to base; lobes ca. 10 mm, ovate or oblong ovate, scaly; corolla funnelform, campanulate, 5-lobed, pale yellow, 3–3.8 cm, outer surface sparsely scaly, without hairs; stamens 10, unequal, 1.9–2.4 cm, filaments pubescent below; ovary 5-locular, densely scaly, otherwise glabrous; style shorter than corolla, longer than stamens, scales absent. Capsule not known.

Rhododendron thickets, rocky cliffs; ca. 3500 m. Xizang.

知识共享:署名-非商业性使用-禁止演绎 FOC Vol.14PDF
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