Variable selection in Platanthera bifolia (Orchidaceae): phenotypic selection differed between sex functions in a drought year.

Abstract excerpt

We estimated selection on three morphological characters in the hermaphroditic, hawkmoth-pollinated orchid Platanthera bifolia and explored selection surfaces through male and female function. The work was carried out in northern Sweden during two flowering seasons (1994 and 1995) in one natural population and one season (1995) in another natural population. Fitness was estimated as number of pollinia removed...

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