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毛萼杜鹃 maoedujuan

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 bainbridgeanum Tagg et Forrest
中文名
毛萼杜鹃
拼音
maoedujuan
文献 Literature
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描述 Description

73.毛萼杜鹃(云南植物研究)图版32:1-5

Rhododendron bainbridgeanum Tagg et Forrest in Stevenson, Spec. Rhodod. 133. 1930; Chamb. in Not. -Bot. Gard. Edinb. 39:277. 1982; 云南植物志4: 395. 1986;西藏植物志3: 574, 1986.

常绿小灌木,高约1-2米;幼枝嫩绿色,有稀疏的腺毛;老枝灰白色,光滑无毛。叶常3-5枚密生于枝顶,革质,长圆状椭圆形至倒卵形,长6-10厘米,宽2-4.5厘米,先端短尖,有细尖头,基部心形,上面绿色,有细密的皱纹,无毛,下面有橄榄色或棕黄色的薄毛被,宿存,中脉在上面下陷呈沟纹,在下面显著隆起,被毛或无毛,侧脉12-14对,在上面微下陷,在下面微突起;叶柄圆柱状,长1-1.5厘米,上面平坦,有沟槽,无毛,下面有明显的腺毛。总状伞形花序,有花4-8朵,总轴长约5毫米,有疏柔毛;花梗细瘦,长约1.5-2.5厘米,密被腺毛;花萼大,裂片5,卵形至长圆形,长4-5(-9)毫米,膜质,外面及边缘有腺毛,内面无毛;花冠钟状,长2.5-3.5厘米,白色至乳黄色,基部有深红色的斑点,5裂,裂片半圆形,长约1.5厘米,宽约1.5-2厘米,顶端有凹缺;雄蕊10,长约1.5-2.5厘米,不等长,花丝基部有短柔毛,花药卵圆形;雌蕊与花冠近等长,长约2.5厘米;子房卵圆形,长约4毫米,被腺毛及丛卷毛,花柱长约2厘米,基部微被腺毛,上部无毛,柱头微膨大。蒴果圆柱状,长2厘米,直径4毫米,弯曲。花期5-6月,果期8-9月。

产云南西北部、西藏东南部。生于海拔3 300-3 700米的山坡灌木丛中。缅甸东北部也有分布。模式标本采自云南贡山。

本种花梗、叶柄及幼枝上均有腺毛,叶片基部心形,下面有疏松的棕色薄毛被;花萼大,萼片卵形或长圆形,长4-5(-9)毫米;花冠白色或乳黄色等特征,不同于本亚组内其他种。

知识共享:署名-非商业性使用-禁止演绎 1994《中国植物志》第57(2)卷 098页 PDF

Shrubs, 1–2 m tall; old branches grayish white, glabrous; young shoots greenish, sparsely glandular-hairy. Petiole terete, adaxially flat, grooved, 10–15 mm, glabrous, abaxially conspicuously glandular hairy; leaf blade leathery, oblong-elliptic to obovate, 6–10 × 2–4.5 cm; base cordate; apex mucronate; abaxial surface indumentum persistent, thin, olivaceous or brownish yellow; adaxial surface green, densely rugulose, glabrous or hairy on midrib; midrib prominent abaxially, impressed adaxially; lateral veins 12–14-paired, slightly raised abaxially, slightly impressed adaxially. Inflorescence racemose-umbellate, 4–8-flowered; rachis ca. 5 mm, pilose. Pedicel slender, 1.5–2.5 cm, densely glandular-hairy; calyx membranous, lobes 5, 4–5(–9) mm, ovate to oblong, outer surface and margin with glandular hairs; corolla campanulate, white to cream, base with deep red spots, 2.5–3.5 cm, lobes 5, suborbicular, ca. 1.5 × 1.5–2 cm, apex emarginate; stamens 10, unequal, 1.5–2.5 cm, filaments pubescent at base; anthers ovate; ovary ovate, ca. 4 mm, glandular hairy; style ca. 2 cm, as long as corolla, base with slightly glandular hairs, stigma slightly expanded. Capsule cylindric, curved, ca. 20 × 4 mm. Fl. May–Jun, fr. Aug–Sep.

Coniferous forests, scrub, mountain slopes; 3300–3700 m. SE Xizang, NW Yunnan [Myanmar].

知识共享:署名-非商业性使用-禁止演绎 FOC Vol.14PDF
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