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树形杜鹃 shuxingdujuan

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 arboreum Smith
中文名
树形杜鹃
拼音
shuxingdujuan
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描述 Description
常绿乔木,高7-14米,从基部以上多分枝。叶革质,矩圆状披针形,长10-20厘米,宽3-6厘米,顶端急尖,基部楔形,上面亮绿色,成长后无毛,叶脉略凹入,下面有白色至黄褐色绒毛,有时成薄层,有时成较厚的绵状毛毡,叶脉隆起,近无毛;叶柄长1-2厘米,圆柱形,上面略有浅沟,初有丛卷毛,下面有腺体。顶生花序紧密,约有花20朵,总轴长约2厘米,有绒毛;花梗长约8毫米,有绒毛和腺体;花萼小,有腺体和绒毛,5裂;花冠筒状钟形,长4-5厘米,深血红色(变种有白色、蔷薇色等),花冠筒基部有5个黑色蜜腺,里面满布深色点,裂片5,有缺刻;雄蕊10,花丝白色;子房有白绒毛。蒴果圆柱形,长3厘米。 产西藏;不丹,印度,斯里兰卡也有。
中国高等植物图鉴

129. 树形杜鹃(中国高等植物图鉴)

Rhododendron arboreum Smith in Exot. Bot. 1: 9. t. 6. 1805; Tagg in Stevenson, Spec. Rhodod. 14. 1930;中国高等植物图鉴3: 88. 图4130. 1974; Cullen et Chamb. in Not. Bot. Gard. Edinb. 37: 328. 1979; Chamb. in Not. Bot. Gard. Edinb. 39: 328. 1982. ——R. puniceum Roxb. in Fl. Brit. India. 2: 409. 1832. ——R. windsorii Nutt. in Hooker's Journ. Bot. Kew Gard. Misc. 5: 357. 1853; 西藏植物志3: 575. 图232. 1-5. 1986.

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 170页 PDF

Trees, usually evergreen, (1–)5–20(–30) m tall; trunk well-defined; bark gray-brownish, exfoliating into thin and small irregular flakes; young shoots stout, with distinct leaf traces, densely grayish tomentose, glabrescent. Winter buds ovoid, 10–12 × 5–6 mm, puberulent. Petiole 10–25 mm with dense fawn indumentum intermixed with glands, sometimes glabrescent; leaf blade leathery, oblong-lanceolate or oblong-oblanceolate, 6–15 × 2–4.5 cm; base cuneate or ± rounded; margin revolute; apex acuminate or acute; abaxial surface with indumentum 1- or 2-layered, densely compacted, white to fawn tomentose, sometimes with loosely floccose brown upper layer, hairs dendroid, glabrescent; adaxial surface reticulate to bullate, glabrous; midrib deeply impressed adaxially; lateral veins 15–26-paired. Inflorescence dense, ca. 20-flowered, rachis 10–15 mm, tomentose. Pedicel ca. 0.9 cm, pilose, glandular; calyx lobes 5, 1–2 mm, small, triangular, sparsely glandular and hairy; corolla tubular-campanulate, pink to deeply crimson, rarely white, 3.5–4 cm, with 5 black-blotched basal nectar pouches and dark flecks; lobes 5, 1.2–1.7 cm, apex emarginate; stamens 10, unequal, 1.7–2.7 cm, filaments glabrous; ovary conoid, 4–6 mm, white-tomentose, sometimes also glandular; style ca. 3.3 cm, glabrous. Capsule cylindric, ca. 30 × 6 mm. Fl. May, fr. Aug.

Forests, thickets, slopes; 1500–3800 m. ?W Guizhou, S Xizang [Bhutan, N India, Kashmir, Nepal, Sikkim, Sri Lanka, N Thailand, N Vietnam].

Three varieties occur in China. The name used in Xizang, “da ma” (打马), refers to the medicinal use of the flowers in treating coughs.

知识共享:署名-非商业性使用-禁止演绎 FOC Vol.14PDF
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