Pollen Morphology as an Aid in Determining Relationships among some Widely Separated Old World Species ofLinum

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Abstract
Of the 25 to 30 species comprising the subgenus Linum, four are known to have multi-aperturate pollen. Of these, L. stelleroides of China differs in several ways from the others and it appears that the multiaperturate condition may have arisen independently in that species. Linum hologynum, of southeastern Europe, and L. marginale and L. monogynum, of Australia and New Zealand, are believed, on the basis of similarities in both pollen and floral morphology, to comprise a single related complex of species. If so, they constitute one of the very few examples of close affinities between plants endemic to Europe and to Australia

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