Supplement to a Treatise on the North American Ranunculi

1 October 1954

journal article
research article
Published by JSTOR in The American Midland Naturalist

Vol. 52 (2) , 328-369
https://doi.org/10.2307/2422237

Abstract

(Cf. A treatise on the North American Ranunculi, ibid. 40(1): 1-261. 1948) The flora of the Aleutian Islands is largely east-Asian and west-American alpine; arctic species are few and mostly rare. The spp. of Ranunculus reflect all three elements. The ranunculi of the North American Continental Divide are endemics of the section Epirotes, related to species in the Arctic and northern Eurasia; this section is absent from the Pacific Coast and eastern North America. The Ranunculus septentrionalis group (section Chrysanthe) is distributed in the form of a Y including (1) the Pacific Coast, (2) the East and Middle West, and (3) Mexico and Central America and the Andes; it is absent from the Rocky Mountain region. R austro-oreganus variety (Ore., type). R eschscholtzii Schlecht. variety hultenianus (Kamchatka, type). R pedatifidus variety affinis (R affinis RBr.) (northern N. Amer.).

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