Insight: Primrose (Primula vulgaris) has two flower morphs known as pin and thrum. A single plant will have either all pin flowers or all thrum flowers.
In the pin form, the stamens are short and the top of the style is prominent, whereas in the thrum form the stamens are long and the style is short. Fertilisation will only occur between pin and thrum flowers.
Related pages: Wild flower posts | British wild flowers gallery
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