Pin-type and thrum-type primroses

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Pin-type (above) and thrum-type (below) primroses. Thrum-type primroses have stamens near the entrance to the flower neck and short pistils; pin-type stamens have stamens near the middle of the neck and long pistils. This arrangement discourages self-pollination and makes cross-pollination more likely.

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Location: Massachusetts,
Photo credit: © Custom Life Science Images / Alamy / Afripics
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Keywords: -pollination, adaptation, angiosperm, angiosperms, anther, anthers, background, black, cross-pollination, dicot, dicots, ericales, eudicot, eudicots, evolution, islc, magnoliophyta, magnoliopsida, pin, pistil, pistils, plain, plant, plants, pollination, polyphenic, polyphenism, primrose, primroses, primula, primulaceae, stamen, stamens, stigma, stigmas, thrum