Historical Background of the Flora of the Pacific Northwest

66 pagesThe modern flora of the Pacific Northwest is characterized by associations which show affinities to floras now occupying widely separated areas (Eurasia, South and Central America) and to floras shown by paleobotanical evidence to have occupied all these areas, but particularly the American West. Distinct distribution patterns, both in time and space, manifest themselves. These patterns are and have been influenced by topographic and climatic changes from the Cretaceous to the present. Three principal sources of associations are evident: evolution in situ; northern regions as shown in the Arcto-Tertiary Geoflora; western Mexico and the southwestern United States as shown in the Madro-Tertiary Geoflora.Funds for publication of Bulletin No. 13 provided by the National Science Foundation, grant GB 3670

CONCENTRATION OF ENVIRONMENTAL EXTREMES AS THE BASIS FOR VEGETATION AREAS

Volume: 9Start Page: 169End Page: 18

PECULIARITIES OF THE COLUMBIA RIVER GORGE FLORA

Volume: 14Start Page: 160End Page: 17

ENVIRONMENTAL EXTREMES AND ENDEMISM

Volume: 9Start Page: 137End Page: 14

A NEW CARDAMINE FROM NORTHERN IDAHO

Volume: 3Start Page: 176End Page: 17