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腺萼马银花 xianemayinhua(石壁杜鹃)
Synonyms:
Rhododendron sanidodeum Tam.
Rhododendron hangzhouense Fang et M. Y. He

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 bachii Levl.
中文名
腺萼马银花
拼音
xianemayinhua
别名
石壁杜鹃
异名
Rhododendron sanidodeum Tam.
Rhododendron hangzhouense Fang et M. Y. He
文献 Literature
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描述 Description
常绿细瘦灌木,高达6米;一年生枝和幼枝有柔毛和疏腺刚毛。叶散生,薄革质,幼时红棕色,边缘有明显的刚毛状细齿,老叶全缘,卵状椭圆形,长3-4厘米,宽1.5-2厘米,顶端锐尖,有明显的凸尖头,基部宽楔形,除中脉外两面无毛;叶柄长约5毫米,有微柔毛,幼时边缘有刚毛。花序侧生于枝上部的叶腋,单花;花梗长1-1.3厘米,有短柔毛和腺头长刚毛;花萼大,5深裂,裂片圆倒卵形,有脉纹,外面有微毛,边缘有腺头毛;花冠白色带淡紫蓝色,宽漏斗状,口径约3厘米,上方3裂片边檐有细深红色点;雄蕊5,极不等长;子房密生腺刚毛。蒴果长等于宿存花萼,卵形,有粗腺毛。 广布于广东、广西、贵州、四川、湖北、湖南、江西、安徽、浙江、福建。生疏林中。
中国高等植物图鉴

254. 腺萼马银花(中国高等植物图鉴)石壁杜鹃(广西植物名录)图版114: 4

Rhododendron bachii Levl. in Fedde, Repert. Spec. Nov. 12; 102. 1913 et Fl. Kouy-Tcheou 152. 1914; Hutch. in Stevenson,Spec. Rhodod. 561. 1930; Rehd, in Journ. Arb. Arn. 15: 275. 1934 et in ibid. 18: 229. 1937; Hand. -Mazz. Symb. Sin. 7:771. 1936;中国高等植物图鉴3: 155. 图4264. 1974; Chamb. in Not. Bot. Gard. Edinb. 35:259. 1977;华南杜鹃花志70. 图14. 1983.——R. hangzhou-ense Fang et M. Y. He in Bull. Bot. Res. 2 (2); 81-82. f. l. 1982 et in Journ. Rhodod. Spec. Foundation 1; 112-113. 1984, syn. nov.——R. sanidodeum Tam in Guihaia 3(3):182. 1983, syn. nov.

常绿灌木,高2-3(-8)米;小枝灰褐色,被短柔毛和稀疏的腺头刚毛。叶散生,薄革质,卵形或卵状椭圆形,长3-5.5厘米,宽1.5-2.5厘米,先端凹缺,具短尖头,基部宽楔形或近于圆形,边缘浅波状,具刚毛状细齿,除上面中脉被短柔毛外,两面均无毛;叶柄长约5毫米,被短柔毛和腺毛。花芽圆锥形,鳞片长圆状倒卵形,外面密被白色短柔毛。花1朵侧生于上部枝条叶腋;花梗长1.2-1.6厘米,被短柔毛和腺头毛;花萼5深裂,裂片卵形或倒卵形,钝头,具条纹,长3-5毫米,宽3-4毫米,外面被微柔毛,边缘密被短柄腺毛;花冠淡紫色、淡紫红色或淡紫白色,辐状,5深裂,裂片阔倒卵形,长1.8-2.1厘米,宽达1.4厘米,上方3裂片内面近基部具深红色斑点和短柔毛;雄蕊5,不等长,长2-2.8厘米,与花冠等长或略比花冠短,花丝扁平,中部以下被微柔毛,花药长圆形,长约3毫米;子房密被短柄腺毛,花柱比雄蕊长,长2.5-3.2厘米,微弯曲,伸出于花冠外,无毛。蒴果卵球形,长7毫米,直径6毫米,密被短柄腺毛。花期4-5月,果期6-10月。

产安徽、浙江、江西、湖北、湖南、广东、广西、四川和贵州。常生于海拔600-1 600米的疏林内。模式标本采自贵州。

本种与马银花 R. ovatum (Lindl.) Planch. ex Maxim. 相近,唯不同在于花萼裂片卵形或倒卵形,边缘密被腺头毛,易于区别。

作者在发表杭州马银花 R. hangzhouense Fang et M. Y. He 时只根据一张标本上的花萼裂片很小而建立的种,后来发现在这一亚属中花萼裂片的大小是有变化的,故将此种合并于腺萼马银花内更为合理;谭沛祥发表的桂东杜鹃 R. sanidodeum Tam是根据叶边缘具细圆齿和腺头刚毛;花萼裂片卵状长圆形,边缘密被流苏状腺毛,这些特征与腺萼马银花非常相近,作者认为以不分开为好,故将此种合并于腺萼马银花中。

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 344页 PDF

Shrubs, 2–3(–8) m tall; young shoots gray-brown pubescent and sparsely glandular-setose. Petiole ca. 5 mm, pubescent and glandular-hairy; leaf blade subleathery, ovate or ovate-elliptic, 3–5.5 × 1.5–2.5 cm; base broadly cuneate or subrounded; margin finely undulate-crenate; both surfaces glabrous except for the pubescent midrib abaxially. Inflorescence subapical, 1-flowered. Pedicel 1.2–1.6 cm, pubescent and glandular-hairy; calyx deeply lobed; lobes ovate or obovate, 3–5 × 3–4 mm, puberulent abaxially or glandular-hairy, margin with dense short glandular hairs, apex obtuse and fluted; corolla rotate, purple or purplish, with dark red flecks on upper three lobes, 1.8–2.1 cm; lobes broadly obovate, ca. 1.4 cm wide, pubescent near the base within; stamens 5, unequal, 2–2.8 cm, as long as or slightly shorter than corolla; filaments flat, puberulent below the middle; ovary densely shortly glandular-hairy; style 2.5–3.2 cm, slightly curved, exserted, longer than stamens, glabrous. Capsule ovoid, ca. 7 × 6 mm, densely shortly glandular-hairy. Fl. Apr–May, fr. Jun–Oct.

Open forests; 600–1600 m. Anhui, Guangdong, Guangxi, Guizhou, Hubei, Hunan, Jiangxi, Sichuan, Zhejiang.

The characters used to separate Rhododendron bachii from R. ovatum are fairly trivial, especially those relating to the calyx indumentum. Furthermore, there is continuous variation in these characters, suggesting that R. bachii should be treated as a synonym of R. ovatum.

知识共享:署名-非商业性使用-禁止演绎 FOC Vol.14PDF
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