Abstract
Morphometric analyses of populations ofCrepis tectorum raised under uniform conditions support the earlier finding based on herbarium studies that extensive divergence has taken place in western Europe with a centre of diversity in the Baltic lowland area. A crossing experiment showed that subsp.pumila on the island of Oland has acquired a wide range of derived characters without the establishment of strong reproductive barriers, the only exception being a weak tendency for crosses with other populations on Oland to yield more fertile F1 offspring than crosses with weedy and non-weedy populations in adjacent regions. Canadian weed populations showed a more uniform response in crosses with subsp.pumila than did morphologically similar weed populations scattered throughout Central Europe. While F2 data suggest a monogenic basis of differences in the extent of leaf dissection, other distinctive traits appear to be governed by multiple genetic factors with individually slight effects.
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