Amphitropical Relationships in the Floras of North and South America

@article{Raven1963AmphitropicalRI,
  title={Amphitropical Relationships in the Floras of North and South America},
  author={P. Raven},
  journal={The Quarterly Review of Biology},
  year={1963},
  volume={38},
  pages={151 - 177}
}
  • P. Raven
  • Published 1963
  • Biology
  • The Quarterly Review of Biology
Amphitropical distributions of vascular plants in the Western Hemisphere are divided into three groups: bipola or high-latitude, with about 30 species; temperate, with about 130 species; and desert, with a substancial number. Close relationships of this sort can be explained either by divergence from a common tropical ancestor or by origin on one side of the tropics and subsequent migration to the other. The latter is true for the great majority of groups discussed. These may have crossed the… Expand
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