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Asarum heterotropoides F. Schmidt - syn.Asiasarum heterotropoides (F.Schmidt) F.Maekawa; Asiasarum sieboldii Miq. ssp.heterotropoides Kitamura - Aristolochiaceae
Chinese wild ginger, 细辛 xi xin (chin.), ケイリンサイシン keirin-saishin (jap., var. mandshuricum)

Herb, native to Korea, northeast of China, Hokkaido (Japan). Two varities are known - var.mandshuricum (indigenous to Korea and northeast China) and var.heterotropoides (Hokkaido).
http://www.ars-grin.gov/cgi-bin/npgs/html/taxon.pl?455755

„Material from China belongs to the endemic form, Asarum heterotropoides f. mandshuricum (Maximowicz) Kitagawa (A. sieboldii Miquel var. mandshuricum Maximowicz; Asiasarum heterotropoides (F. Schmidt) F. Maekwa var. mandshuricum (Maximowicz) F. Maekawa); whereas f. heterotropoides is restricted to Japan. The authentic traditional Chinese medicine 细辛 (xi xin).“
http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=200006652

The dried rhizome and roots of Asiasarum heterotropoides are used together with the very similar Asiasarum sieboldii roots as Asiasarum root or Asarum root, Asiasari radix. The drug (var.heterotropoides) yields a volatile oil (1.6-1.9%) with methyl eugenol, safrole, and eucarvon. The roots of var. mandshuricum contain more oil (2.2-5.5%), with methyl eugenol (47%) as main constituent, further safrole, elemicin and eucarvone, some alpha-pinene and aliphatic amides (pellitorine e.g.). Higenamine is stated as characteristic for the Asiasarum heterotropoides.
[Hagers Handbuch der Pharmazeutischen Praxis, Springer 2010] Fujita Y, Bot.Mag.Tokyo, 79, (1966), 783-790; Yasuda I, Takeya K, Itokawa H, Chem.Pharm.Bull., 29, (1981), 564-6; Liu L, Li Y, Chem CC Chou TC, Wang HH, cit. CA 96, 126043

Two lignanes, asarinin and xanthoxylol, were isolated and exhidited antitumor effects in mice.
[Takasaki M, Konoshima T, Yasuda I, Hamano T, Tokuda H, Biol.Pharm.Bull., 20(7), (1997), 776-780]