Evidence for the selective origin of incompatibility barriers in the leafy-stemmed Gilias.

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Abstract
Nine intersterile species of annual gilias in Pacific North and South America, belonging to the same natural group (leafy-stemmed gilias), fall into 2 classes with regard to geographical distribution. Five species in the California foothills and valleys are sympatric. Four maritime species are completely allopatric in relation to one another, and either completely or mainly allopatric in relation to the foothill-and-valley species. The sympatric foothill species are isolated by very strong incompatibility barriers, whereas the allopatric maritine species can be crossed inter se with the greatest of ease. The observed correlation between crossability and geographical distribution is interpreted as evidence in favor of the hypothesis of a selective origin of hybridization-preventing mechanisms in annual plants under conditions of sympatry.

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