二球悬铃木Platanus acerifolia
中文名（Chinese Name）：二球悬铃木
学名（Scientific Name）：Platanus acerifolia (Aiton) Willd.
英文名（English Common Name）：London planetree
别名（Chinese Common Name）：英国梧桐
异名（Synonym）：Platanus × acerifolia (Ait.) Willd. Platanus orientalis var. acerifolia Aiton Platanus hybridus Brot.
科属（Family & Genus）：悬铃木科（Platanaceae）悬铃木属
形态特征（Description）：落叶大乔木，高30余米，树皮光滑，大片块状脱落；嫩枝密生灰黄色绒毛；老枝秃净，红褐色。叶阔卵形，宽12-25厘米，长10-24厘米，上下两面嫩时有灰黄色毛被，下面的毛被更厚而密，以后变秃净，仅在背脉腋内有毛；基部截形或微心形，上部掌状5裂，有时7裂或3裂；中央裂片阔三角形，宽度与长度约相等；裂片全缘或有1-2个粗大锯齿；掌状脉3条，稀为5条，常离基部数毫米，或为基出；叶柄长3-10厘米，密生黄褐色毛被；托叶中等大，长约1-1.5厘米，基部鞘状，上部开裂。花通常4数。雄花的萼片卵形，被毛；花瓣矩圆形，长为萼片的2倍；雄蕊比花瓣长，盾形药隔有毛。果枝有头状果序1-2个，稀为3个，常下垂；头状果序直径约2.5厘米，宿存花柱长2-3毫米，刺状，坚果之间无突出的绒毛，或有极短的毛。
分布（Distribution）：本种是三球悬铃木与一球悬铃木的杂交种，久经栽培。
用途（Use）：
引自中国植物志英文版：FOC Vol. 9 Page 44
Platanus acerifolia (Aiton) Willdenow, Sp. Pl. 1: 474. 1797.
二球悬铃木 er qiu xuan ling mu| Platanaceae | Platanus
Platanus orientalis Linnaeus var. acerifolia Aiton, Hort. Kew. 3: 364. 1789; P. hybrida Brotero.
Trees deciduous, to 30 m tall. Young branchlets densely gray-yellow tomentose, old ones red-brown, glabrous. Stipules 1–1.5 cm; petiole 3–10 cm, densely yellow-brown pubescent; leaf blade broadly ovate, 12–25 × 10–24 cm, (3 or)5(or 7)-lobed, gray-yellow pubescent on both surfaces when young, glabrate and then pubescent only at vein axils abaxially, principal veins 3(or 5), arising from base or lateral 2(or 4) from midvein above base, base subcordate or truncate; lobes entire or coarsely 1- or 2-dentate at margin; central lobe broadly triangular, as long as wide. Flowers usually 4-merous. Male flowers: sepals ovate, pubescent; petals oblong, ca. 2 × as long as sepals; stamens longer than petals; anther connective peltate, pubescent. Fruiting branchlets with (1 or)2(or 3) infructescences. Infructescence capitate, ca. 2.5 cm in diam. Achenes with persistent style spiniform, 2–3 mm; basal hairs absent or very short, not exserted from infructescence. Fl. Mar–May, fr. Jun–Oct.
Cultivated in C, NE, and S China [of cultivated origin in SW Asia or Europe].
This widely planted tree is either a hybrid between Platanus occidentalis and P. orientalis or a cultivar of P. orientalis; the origin has been much discussed but remains uncertain.
（责任编辑：徐晔春）
学名（Scientific Name）：Platanus acerifolia (Aiton) Willd.
英文名（English Common Name）：London planetree
别名（Chinese Common Name）：英国梧桐
异名（Synonym）：Platanus × acerifolia (Ait.) Willd. Platanus orientalis var. acerifolia Aiton Platanus hybridus Brot.
科属（Family & Genus）：悬铃木科（Platanaceae）悬铃木属
形态特征（Description）：落叶大乔木，高30余米，树皮光滑，大片块状脱落；嫩枝密生灰黄色绒毛；老枝秃净，红褐色。叶阔卵形，宽12-25厘米，长10-24厘米，上下两面嫩时有灰黄色毛被，下面的毛被更厚而密，以后变秃净，仅在背脉腋内有毛；基部截形或微心形，上部掌状5裂，有时7裂或3裂；中央裂片阔三角形，宽度与长度约相等；裂片全缘或有1-2个粗大锯齿；掌状脉3条，稀为5条，常离基部数毫米，或为基出；叶柄长3-10厘米，密生黄褐色毛被；托叶中等大，长约1-1.5厘米，基部鞘状，上部开裂。花通常4数。雄花的萼片卵形，被毛；花瓣矩圆形，长为萼片的2倍；雄蕊比花瓣长，盾形药隔有毛。果枝有头状果序1-2个，稀为3个，常下垂；头状果序直径约2.5厘米，宿存花柱长2-3毫米，刺状，坚果之间无突出的绒毛，或有极短的毛。
分布（Distribution）：本种是三球悬铃木与一球悬铃木的杂交种，久经栽培。
用途（Use）：
引自中国植物志英文版：FOC Vol. 9 Page 44
Platanus acerifolia (Aiton) Willdenow, Sp. Pl. 1: 474. 1797.
二球悬铃木 er qiu xuan ling mu| Platanaceae | Platanus
Platanus orientalis Linnaeus var. acerifolia Aiton, Hort. Kew. 3: 364. 1789; P. hybrida Brotero.
Trees deciduous, to 30 m tall. Young branchlets densely gray-yellow tomentose, old ones red-brown, glabrous. Stipules 1–1.5 cm; petiole 3–10 cm, densely yellow-brown pubescent; leaf blade broadly ovate, 12–25 × 10–24 cm, (3 or)5(or 7)-lobed, gray-yellow pubescent on both surfaces when young, glabrate and then pubescent only at vein axils abaxially, principal veins 3(or 5), arising from base or lateral 2(or 4) from midvein above base, base subcordate or truncate; lobes entire or coarsely 1- or 2-dentate at margin; central lobe broadly triangular, as long as wide. Flowers usually 4-merous. Male flowers: sepals ovate, pubescent; petals oblong, ca. 2 × as long as sepals; stamens longer than petals; anther connective peltate, pubescent. Fruiting branchlets with (1 or)2(or 3) infructescences. Infructescence capitate, ca. 2.5 cm in diam. Achenes with persistent style spiniform, 2–3 mm; basal hairs absent or very short, not exserted from infructescence. Fl. Mar–May, fr. Jun–Oct.
Cultivated in C, NE, and S China [of cultivated origin in SW Asia or Europe].
This widely planted tree is either a hybrid between Platanus occidentalis and P. orientalis or a cultivar of P. orientalis; the origin has been much discussed but remains uncertain.
（责任编辑：徐晔春）
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