Cowslip (IMAGE)

Estonian Research Council

Cowslip

Caption

Cowslip is a distylous species with two morphologically different types of flowers. Plants with short-styled or S-morphs (photo A; sometimes referred to as thrum plants) carry flowers with a short style and long anthers, while long-styled L-morphs (or pin plants; photo B) have a long style and short anthers. Generally, successful fertilization takes place only in case of reciprocal pollen flow between different morphs, while within-morph crosses lead to no progenies.

Credit

Photos: Tsipe Aavik

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