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The highly disjunct arctic-alpine Saxifraga rivularis
During the last couple of decades, the small, arctic-alpine Saxifraga rivularis L. (Fig. 1, 3) has been studied using molecular markers in order to learn more about its origin, genetic variation and distinctiveness. The results have indicated where it may have had its refugia during the last glaciation, and how it has reached its current distribution. Many researchers have been involved, and several international papers have been published. Here, I summarize some of what we now know about this rather anonymous, but quite remarkable little herb.
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