Distribution maps

(online von http://www.mobot.org/MOBOT/research/APweb/ . Dort zitiert wie unter jedem Diagramm vermerkt):

Ranunculaceae
map: from Vester 1940; Hultén 1971; Wilson 2007

Hydrastidoideae (Ranunculaceae)
Hydrastis canadense. C. and E. North America (map: from Li 1952, red)