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折多杜鹃 zheduodujuan

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 bonvalotii Bureau et Franch.
中文名
折多杜鹃
拼音
zheduodujuan
文献 Literature
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描述 Description

237.折多杜鹃(新拟)

Rhododendron bonvalotii Bur. et Franch. in Morot Journ. de Bot. 5; 94. 1891; Tagg in Stevenson, Spec. Rhodod. 727. 1930; Cullen et Chamb. in Not. Bot. Gard. Edinb. 36: 120. 1978; Chamb. in Not. Bot. Gard. Edinb. 39; 418. 1982.

灌木;幼枝细瘦,无毛。叶革质,椭圆形或长圆状披针形,长4-5厘米,宽约1.5厘米,先端锐尖,基部圆形,边缘微向下反卷,上面深绿色,无毛,微有光泽,有2-4条纵向的脊状隆起,下面暗绿色;中脉在上面微下凹,在下面隆起,侧脉12-14对,在两面均微现;叶柄圆柱状,长5-8毫米,有短柄腺体。总状伞形花序,有4-5花;总轴粗壮,常无毛;花梗粗短,长约1.5厘米,有短柄腺体;花萼较大,5裂,萼片卵形或近于圆形,长4-5毫米,不等大,外面及边缘有腺体;花冠钟状,粉红色,长2.5厘米,5裂,裂片椭圆形至近于圆形,长约1厘米,宽约1.5厘米,顶端有凹缺;雄蕊10,长1-1.5厘米,不等长,花丝无毛,花药长圆形;雌蕊长约2厘米;子房卵球形,长约4-6毫米,密被腺体,花柱通体有腺体。果未见。

产四川西南部。模式标本采自四川康定附近。

本种的花萼较大,应属于本亚组的特征,但是叶片较窄,椭圆形或长圆状倒披针形,十分特殊,自1891年后未能在康定重新采得本种的标本,著者仔细研究过存于英国爱丁堡植物园的模式标本,仅此一份,可能是一杂交种。

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 326页 PDF

Shrubs; young shoots glabrous. Petiole cylindric, 5–8 mm, shortly glandular-hairy; leaf blade elliptic or oblong-lanceolate, 4–5 × ca. 1.5 cm; base obtuse or rounded; margin revolute; apex acute; abaxial surface greenish, glabrous; adaxial surface deep green, slightly shiny, with 2–4 longitudinal ridges towards the apex; midrib prominently raised abaxially, grooved adaxially; lateral veins 12–14-paired, obscure. Inflorescence racemose-umbellate, usually 4- or 5-flowered; rachis stout, ca. 15 mm, shortly glandular-hairy. Calyx lobes 5, ca. 4 mm, ovate or irregularly suborbicular, fringed with glands; corolla campanulate, pale pink, 2–2.5 cm, lobes 5, suborbicular, ca. 1 × 1.5 cm, emarginate; stamens 10, 1–1.5 cm, unequal, filaments glabrous; ovary ovoid, 4–6 mm, densely glandular; style glandular to tip. Capsule not known.

W Sichuan (near Kangding).

This species has the flower characters of Rhododendron subsect. Thomsonia, but the elliptic or oblong-oblanceolate leaves resemble those of R. selense, suggesting that it could be hybrid of R. selense, possibly with R. souliei. It has not been seen since it was first collected over a century ago.

知识共享:署名-非商业性使用-禁止演绎 FOC Vol.14PDF
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