紫苏原产我国，亦有山苏、香苏、苏叶等称谓，属唇形科一年生草本植物。其植株高０．３～１米，茎四棱形，紫色或紫绿色，多分枝，在茎节处毛较密，全株芳香，叶对生，有长柄，叶边缘有小锯齿，两面有稀毛，叶背有油点。夏秋之间，开淡紫色的唇形小花，顶生或腋生，总状花序。? Perilla is native to China and is also known as Sansu, Xiangsu and Suye. It is an annual herb of the Labiatae family. Its plants are 0.3-1 m high, stems are 4-angled, purple or purplish green, much branched, hairs are dense at the stem sections, the whole plant is aromatic, leaves are opposite, have long handles, and the leaves have small serrations on both sides. There are thin hairs and there are oil spots on the leaves. Between summer and autumn, lavender lip flowers, terminal or axillary, racemes. ?