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一球悬铃木Platanus occidentalis

时间:2013-10-30 12:41来源:未知 作者:徐晔春 点击:
中文名( Chinese Name ):一球悬铃木 学名( Scientific Name ): Platanus occidentalis L. 英文名( English Common Name ): American sycamore 别名( Chinese Common Name ): 美国梧桐 异名( Synonym ): Platanus glabrata Fern. Platanus occ
中文名(Chinese Name):一球悬铃木
学名(Scientific Name):Platanus occidentalis L.
英文名(English Common Name):American sycamore
别名(Chinese Common Name):美国梧桐
异名(Synonym):Platanus glabrata Fern.  Platanus occidentalis var. glabrata (Fern.) Sarg.  Platanus excelsa Salisb.  Platanus integrifolia hort. ex C. Koch  Platanus lobata Moench  Platanus orientalis var. occidentalis (L.) Kuntze  Platanus pyramidalis hort. ex Dippel 
科属Family & Genus):悬铃木科(Platanaceae)悬铃木属
形态特征Description):落叶大乔木,高40余米;树皮有浅沟,呈小块状剥落;嫩枝有黄褐色绒毛被。叶大、阔卵形,通常3浅裂,稀为5浅裂,宽10-22厘米,长度比宽度略小;基部截形,阔心形,或稍呈楔形;裂片短三角形,宽度远较长度为大,边缘有数个粗大锯齿;上下两面初时被灰黄色绒毛,不久脱落,上面秃净,下面仅在脉上有毛,掌状脉3条,离基约1厘米;叶柄长4-7厘米,密被绒毛;托叶较大,长约2-3厘米,基部鞘状,上部扩大呈喇叭形,早落。花通常4-6数,单性,聚成圆球形头状花序。雄花的萼片及花瓣均短小,花丝极短,花药伸长,盾状药隔无毛。雌花基部有长绒毛;萼片短小;花瓣比萼片长4-5倍;心皮4-6个,花柱伸长,比花瓣为长。头状果序圆球形,单生稀为2个,直径约3厘米,宿存花柱极短;小坚果先端钝,基部的绒毛长为坚果之半,不突出头状果序外。
分布(Distribution):原产北美洲,现广泛被引种,我国北部及中部。
用途(Use):有栽培作行道树及观赏用。
引自中国植物志英文版:FOC Vol. 9 Page 45      
Platanus occidentalis Linnaeus, Sp. Pl. 2: 999. 1753.
一球悬铃木 yi qiu xuan ling mu| Platanaceae  | Platanus
Trees deciduous, to 40 m tall. Young branchlets yellow-brown tomentose. Stipules 2–3 cm, bugle-shaped, deciduous; petiole 4–7 cm, densely tomentose; leaf blade broadly ovate, 8–20 × 10–22 cm, 3(or 5)-lobed, gray-yellow tomentose on both surfaces at first, soon glabrate and then pubescent only along veins abaxially, principal veins 3, lateral 2 arising from midvein ca. 1 cm above base, base broadly cordate, truncate, or subcuneate; lobes shortly triangular, margin coarsely numerous dentate. Flowers 4–6-merous. Male flowers: sepals and petals short, small; filaments very short; anthers peltate, elongate; connective glabrous. Female flowers: long tomentose at base; sepals short, small; petals 4–5 × as long as sepals; carpels 4–6; styles elongate, longer than petals. Fruiting branchlets with 1(or 2) infructescences. Infructescence globose, ca. 3 cm in diam. Achenes obtuse at apex, with persistent style very short; basal hairs ca. 1/2 as long as achene, not exserted from infructescence. Fl. Mar–May, fr. Jun–Oct.
Cultivated in C and N China [native to North America].
 






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