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丹巴杜鹃 danbadujuan

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 danbaense L. C. Hu
中文名
丹巴杜鹃
拼音
danbadujuan
文献 Literature
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描述 Description

172. 丹巴杜鹃(植物研究)图版70:1-5

Rhododendron danbaense L. C. Hu in Bull. Bot. Res. 6: 155. 1986;中国四川杜鹃花142-144. 1986.

常绿灌木,高3-4米;枝条近圆柱形,粗壮,直径8-10毫米;幼时密被淡黄棕色或带灰色的分枝柔毛,无腺体。叶厚革质,长圆状椭圆形或椭圆形,长9-12.5厘米,宽3.5-4.5厘米,先端渐尖,基部心形或近圆形,边缘稍反卷,上面绿色,除中脉槽内基部被毛外,其余无毛,侧脉15-16对,微凹,下面毛被厚,棕色至黄棕色,由多分枝的长柔毛组成,中脉凸起,侧脉隐藏于毛被内;叶柄粗,长1-2厘米,上面扁平,密被灰色分枝长柔毛。顶生伞形花序,有花6-8朵;总轴短,长3毫米;苞片长约2厘米,倒卵形,顶端急尖,两面被绢状毛,脱落;花梗长1-2厘米,密被分枝长柔毛,并混生稀疏 的长柄腺体;花萼小,黄绿色,长2.5-3毫米,裂片5,阔三角形,外面疏被长柔毛和长柄腺体,边缘具腺头睫毛;花冠漏斗状钟形,长4-4.5厘米,白色,内面近中部具多数洋红色斑点,裂片5,近圆形或卵形,长1.5厘米,宽2.3厘米,顶端微缺;雄蕊10,不等长,长1.5-2.5厘米,花丝扁平,基部被白色微柔毛或无毛,花药长圆形,淡黄褐色,长3毫米;雌蕊比花冠短,比雄蕊长;子房圆锥形,长5-6毫米,密被长柄腺体,向顶部混生长柔毛,花柱中部以下密被长柔毛和长柄腺体,柱头盘状。果未见。花期5月。

产四川西部。生于海拔3 400米的丛林中。模式标本采自四川丹巴。

本种与锈红色杜鹃R. bureavii Franch. 相近,但本种的小枝和叶柄均密被分枝长柔毛,无腺体,花萼小,仅长2.5-3毫米,花较大,白色,花冠长4-4.5厘米,花柱中部以下密被长柔毛和长柄腺体,易于区别。

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 228页 PDF

Shrubs, 3–4 m tall; branchlets subterete, 8–10 mm in diam., densely fawn to grayish branched-pubescent when young. Petiole stout, 10–20 mm, densely gray branched-villous; leaf blade thickly leathery, oblong-elliptic to elliptic, 9–12.5 × 3.5–4.5 cm; base cordate to rounded; margin slightly revolute; apex acuminate; abaxial surface brown to yellowish brown, indumentum thick, 1-layered, densely villous, hairs multi-branched; adaxial surface with grooved midrib tomentose, otherwise glabrous. Inflorescence umbellate, 6–8-flowered; rachis ca. 3 mm; perulae deciduous. Pedicel 1–2 cm, densely branched-villous and with long-stalked glands; calyx yellow-green, lobes 5, 2.5–3 mm, broadly triangular, sparsely villous, margin ciliate with long-glandular hairs; corolla funnelform-campanulate, white, with copious carmine spots, 4–4.5 × ca. 4.5 cm; lobes 5, ca. 1.5 × 2.3 cm, emarginate; stamens 10, unequal; filaments glabrous or puberulent at base; ovary 5–6 mm, densely long-glandular-hairy, villous towards apex; style ca. 2.8 cm, shorter than corolla and longer than stamens, densely villous and long-glandular-hairy below middle; stigma discoid. Fl. May.

Forests; ca. 3400 m. W Sichuan (Danba).

Without seeing the type specimen of Rhododendron danbaense, it cannot be confirmed if the leaf indumentum is truly unistrate, and it is therefore uncertain how this species relates to R. nigroglandulosum and to R. bureavioides (with a very poorly developed, white lower layer of indumentum). Rhododendron bureavioides should probably be recognized as a distinct species (see under R. bureavii above). Its type has large calyx lobes 6–8 mm, a character that will technically distinguish it from both R. danbaense and R. nigroglandulosum. All three species are distributed in the same region, close to and N of Kangding in W Sichuan.

知识共享:署名-非商业性使用-禁止演绎 FOC Vol.14PDF
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