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Evolution and Biogeography of Saxifragaceae with Guidance from Their Rust Parasites
D. B. O. Savile
Annals of the Missouri Botanical Garden
Vol. 62, No. 2 (1975), pp. 354-361
Published by: Missouri Botanical Garden Press
Stable URL: http://www.jstor.org/stable/2395201
Page Count: 8
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A lineage of short-cycled rusts, Puccinia species, is recorded on 10 genera and 86 species of Saxifragaceae, including 10 sections and various subsections of Saxifraga. These rusts can be arranged approximately in evolutionary sequence. From the rust data it is inferred that Saxifragaceae originated in eastern Asia; migrants radiated early in the Himalayan Region and western North America; a return migrant from North America established Saxifraga in or near Japan; migrants from Japan established slightly advanced Saxifraga groups in the Himalayas and western North America; migrants from the Himalayas (related to Melanocentrae) established moderately advanced Saxifraga groups in Europe and North America; finally Himalayan migrants (related to sect. Kabschia) established sect. Trachyphyllum in Beringia and sects. Xanthizoon, Euaizoonia and Porphyrion in the Alps. These last sections probably evolved during the Pleistocene.
Annals of the Missouri Botanical Garden © 1975 Missouri Botanical Garden Press