Name: Canker Root, Threeleaf goldthread (EN)
Distribution: Siberia (Yakutia); Russian Far East (Kamchatka, Khabarovsk, Kuril Isl., Magadan, Primorye, Sakhalin); Japan (Hokkaido, Honshu); Alaska; Aleutes; Greenland; Canada (Alberta, British Columbia, Labrador, Manitoba, New Brunswick, Newfoundland, Nova Scotia, Nunavut, Ontario, Prince Edward Isl., Québec, Saskatchewan); St. Pierre et Miquelon; USA (Connecticut, Indiana, Massachusetts, Maryland, Maine, Michigan, Minnesota, North Carolina, New Hampshire, New Jersey, New York, Ohio, Oregon, Pennsylvania, Rhode Island, Virginia, Vermont, Wisconsin, West Virginia)
30 SIB 31 RFE 38 JAP 70 ASK CDN GNL 71 CDN 72 CDN SPM 73 USA 74 USA 75 USA 78 USA
Synonyms: hidden
= Anemone groenlandica Oeder; G. C. Oeder & al. (eds.), Fl. Dan. 4(10): 5 (1771)
= Chryza borealis Raf.; Med. Repos. N. York 5: 352 (1808)
= Coptis daisetsuensis Tatew. ex Miyabe & Tatew.; Trans. Sapporo Nat. Hist. Soc. 14: 2 (1935)
= Coptis groenlandica (Oeder) Fernald; Rhodora 31: 142 (1929)
= Coptis trifolia subsp. groenlandica (Oeder) Hultén; Fl. Aleutian Isl. 178 (1937)
= Coptis trifolia var. groenlandica (Oeder) Fassett; Trans. Wisconsin Acad. Aci. 38: 195 (1947)
= Coptis trifolia var. semiplena Miyabe & Tatew.; Trans. Sapporo Nat. Hist. Soc. 14: 2 (1935)
= Helleborus pumilus Salisb.; Prodr. Stirp. Chap. Allerton: 374 (1796)
= Helleborus trifoliatus Houtt.; Nat. Hist. 2(9): 262 (1778)
= Helleborus trifolius L.; Sp. Pl.: 558 (1753)
= Helleborus trilobus Lam.; Encycl. 3: 98 (1789)
= Isopyrum trifolium (L.) Britton; Bull. Torrey Bot. Club 18: 265 (1891)