Arctic and Alpine Vegetations: Similarities, Differences, and Susceptibility to Disturbance

According to Diels (1937), the species of plant reaching the highest elevation on Chimborazo is Draba depressa, at 5600 m. At sealevel on Kap Morris Jesup, the northernmost plant species is Saxifraga oppositifolia (Holmen 1957). Between these widely separated points, floristic relationships are apparent: eight species of Draba occur in Peary Land and nine species of the same genus, plus one species of Saxifraga, are in the alpine vegetation above 4500 m on Chimborazo. Environmental-

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