一球悬铃木Platanus occidentalis Linn.
一球悬铃木Platanus occidentalis Linn.
3. 一球悬铃木 美国梧桐（陈嵘，中国树木分类学）
Platanus occidentalis Linn. Sp. Pl. 417, 1753; DC. Prodr. l. c.
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。
原产北美洲，现广泛被引种，我国北部及中部。
有栽培作行道树及观赏用。
《Flora of China》 Vol. 9 (2003)
Platanus occidentalis Linnaeus
一球悬铃木 yi qiu xuan ling mu
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].
别名：美桐;美洲悬铃木;美国梧桐;二球悬铃木;单球悬铃木;悬铃木;北美悬铃木;美国悬铃木;American sycamore;
科名：悬铃木科 Platanaceae
属名：悬铃木属 Platanus
3. 一球悬铃木 美国梧桐（陈嵘，中国树木分类学）
Platanus occidentalis Linn. Sp. Pl. 417, 1753; DC. Prodr. l. c.
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。
原产北美洲，现广泛被引种，我国北部及中部。
有栽培作行道树及观赏用。
《Flora of China》 Vol. 9 (2003)
Platanus occidentalis Linnaeus
一球悬铃木 yi qiu xuan ling mu
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].