本草考證認(rèn)為：古代藥用夏枯草來源于夏枯草屬的夏枯草和山菠菜，藥用部位古代用莖葉，現(xiàn)代用果穗，采集季節(jié)古代在花期，現(xiàn)代在果穗半枯時(shí)期，經(jīng)用現(xiàn)代方法證明；花期、果期都可作為采收季節(jié)，藥用部位以全草為宜。

Herbalogical study shows that Xiakucao used in ancient times came from Prunella vulgaris and P. asiotica. The Portion used for medical purpose in ancient times was its stem and leaf, collected during the period of blooming. The portion used today was the spike, collected approach withering. Modern analytical determination showed that the aerial parts of three Prunella specics can also be used as medicine when collected in june and july.