北细辛Asarum heterotropoides.var.mandshuricum(maxim.)Kitag.为马兜铃科多年生草本植物。全草为常用中药,具有发表散寒、温肺祛痰的功效。主产东北各省,尤以辽宁产量高,质量佳,故有“辽细辛”之称。北细辛根茎上着生多数不定根和越冬芽。越冬芽于秋季进入休眠状态,次年4月萌动、出土、展叶、开花,6月果实成熟。新鲜种子须经30—40天的后熟阶段,种胚才能分化形成。当年播种后,须经低温期,第二 Asarum Asarum heterotropoides.var.mandshuricum (maxim.) Kitag. Aristolochiaceae perennial herb. The whole plant is commonly used traditional Chinese medicine, with the publication of cold, warm lung expectorant effect. Main producing northeast provinces, especially in Liaoning high yield, good quality, it is “Liao Xixin” said. Asarum rootstock most adventitious roots and winter buds. Wintering buds enter dormancy in autumn, germinating in April of the following year, unearthed, displaying leaves, blooming and fruit ripening in June. After 30-40 days of fresh seeds to mature stage, embryo differentiation can be formed. After sowing that year, subject to low-temperature period, the second