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百里香别名地椒、麝香草、山胡椒,为唇形科百里香属多年生常绿亚灌木。株高15～20cm,冠幅约30cm,全株具芳香。茎木质、细长,匍匐茎平卧,上密生许多直立茎,新生枝带紫色。老茎紫褐色或灰褐色。叶小,对生,长2～5cm,叶面浓绿,叶背绿中带白色,两面均有油腺点。轮伞花序顶生,花小,唇形,粉色或淡紫色。小坚果椭圆形,深红棕色,千粒重约0.1g,种子萌发力可保持3年。
Thyme alias pepper, thyme, mountain pepper, for the Labiatae thyme evergreen sub-shrubs. Plant height 15 ~ 20cm, crown width of about 30cm, whole plant with aroma. Stems woody, slender, stolon lying, many erect upper stems, new branches purple. Old stem purple brown or gray brown. Leaves small, opposite, long 2 ~ 5cm, dark green leaves, green leaves with white, both sides have oil gland point. Umbels top, flowers small, lip, pink or lavender. Small nuts oval, dark reddish brown, 1000 grain weight of about 0.1g, seed germination force can be maintained for 3 years.