Pollen Morphology ofLinum, Sect. Linastrum (Linaceae)

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Abstract
In the genus Linum sect. Linastrum, pollen grains interpreted as primitive are characteristic of most Old World species and species of southeastern South America and Mexico. The Old World species are more uniform but the few species of the Mediterranean region and the single species of India possess larger grains, thicker exine or more polymorphic sculpturing. In South America, pollen grains of the species of Peru and Chile are the largest, have the thickest exine and the most polymorphic exine sculpturing of any on the continent. The greatest variation is shown by the North American species. Within the Linum rigidum-complex are found the largest pollen grains of the genus with the thickest exine and the greatest number of apertures. These species are considered the most specialized in the genus with respect to their pollen morphology.

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