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Floral nectar spurs are widely considered a key innovation promoting diversification in angiosperms by means of pollinator shifts. We investigated the macroevolutionary dynamics of nectar spurs in the tribe Antirrhineae (Plantaginaceae), which contains 29 genera and 300–400 species (70–80% spurred). The effect of nectar spurs on diversification was tested, with special focus on Linaria, the genus...
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