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形态描述
落叶灌木或小乔木，高达9m，树皮光滑，片状脱落，灰白色或灰褐色。枝干多扭曲，小枝具4棱，略成翅状。叶互生或有时对生，叶片纸质，椭圆形、宽长圆形或倒卵形，长3~7cm，宽1.5~4cm，先端短尖或钝形，有时微凹，基部宽楔形或近圆形，无毛或下面沿中脉有微柔毛，侧脉3~7对，叶柄无或很短。花淡红色、淡紫色，直径3~4cm，组成顶生圆锥花序，中轴及花梗无或稀被柔毛；花萼长7~10mm，外面平滑无棱，两面无毛，6裂，裂片三角形，裂片间无附属体；花瓣6，皱缩，长12~20mm，具长瓣柄，雄蕊36~42，外面6枚着生于花萼上，比其余的长得多；子房无毛。蒴果椭圆状球形或宽椭圆形，长8~13mm，幼时绿色至黄色，成熟时或干燥时呈紫黑色，室背开裂。种子连翅长约8mm。花期7~9月，果期9~11月。染色体数目为2n=48。
分布地区
原产东亚至南亚、东南亚，世界各地广泛栽培。杭州各公园庭院常见栽培。
主要用途
花色鲜艳美丽，花期长，为庭园观赏树，有时亦作盆景；木材坚硬、耐腐，可作农具、家具、建筑等用材；根、树皮、叶及花供药用。
其它
本种园艺上有较多品种，其中常见的有银薇cv. Alba（花白色）及翠薇cv. Rubra（花兰紫色）两个品种。
中国植物志英文版
Lagerstroemia chinensis Lamarck; Murtughas indica (Linnaeus) Kuntze. Shrubs or small trees, to 7 m tall. Branchlets slender, 4-angled or subalate, puberulous, glabrescent. Leaves sessile or with petiole to ca. 2 mm; leaf blade elliptic, oblong, obovate, or suborbicular, typically at least some suborbicular to obovate and mucronate, 2.5-7[-10] × 1.5-4 cm, papery to slightly leathery, glabrous or with slight indumentum on veins abaxially, lateral veins 3-7 pairs, base broadly cuneate to rounded, apex acute, obtuse with small mucro, or retuse. Panicles subpyramidal, 7-20 cm, puberulous, densely flowered. Floral tube 6-merous, 7-11 mm, smooth walled or obscurely to decidedly 6-ribbed, glabrous; sepals 3.5-5.5 mm, adaxially glabrous; annulus present; epicalyx absent. Petals purple, fuchsia, pink, or white, orbicular, 1.2-2 cm including claw 6-9 mm. Stamens 36-42, dimorphic. Ovary glabrous. Capsules ellipsoidal, 1-1.3 × 0.7-1.2 cm, 4-6-valved. Seeds including wing ca. 8 mm. Fl. Jun-Sep, fr. Sep-Nov. 2n = 48, 50. Semishaded places, rich fields, wild or cultivated. Anhui, Fujian, Guangdong, Guangxi, Guizhou, Hainan, Henan, Hubei, Hunan, Jiangxi, Jilin, Shandong, Shanxi, Sichuan, Taiwan, Yunnan, Zhejiang [Bangladesh, Bhutan, Cambodia, India, Indonesia, Japan, Laos, Malaysia, Myanmar, Nepal, Pakistan, Philippines, Singapore, Sri Lanka, Thailand, Vietnam; widely cultivated throughout these and other warm regions of the world].----from “Flora of China”
