紫薇(细叶紫薇、痒痒树、百日红)千屈菜科Lagerstroemia indica Linn.落叶灌木或小乔木,高2￣6(￣8)m。干多弯曲,分枝低,基部常具萌蘖;树皮灰褐色,薄片状剥落后呈黄灰色,光滑细腻;幼枝四棱形,具狭翅。枝干质硬,用手触摸树干,枝梢随之颤动,似怕痒,故别称“痒痒树”。树冠圆球形 Lagerstroemia indica Linn. Deciduous shrubs or small trees, high 2 ~ 6 (~ 8) m. Dry and more curved, low branches, the base often with sprout; bark beige, flaky yellowish gray after peeling, smooth and delicate; young branches quadrangular, with narrow wings. Branches dry hard, touch the trunk by hand, then trembling shoots, like itchy, so alias “itch tree.” Tree crown spherical