An example of <a href="https://en.wikipedia.org/wiki/Heterostyly" class="extiw" title="en:Heterostyly">heterostyly</a>: Pin (A) and thrumb (B) flowers of the common primrose (<i>Primula vulgaris</i>), a distylous species. Pin and thrum flowers are borne by different plants. This genetically controled polymorphism enhances allogamy. Legend: (1) corolla, (2) calix, (3) stamen, (4) pistil.
<a href="//commons.wikimedia.org/wiki/User:Berrucomons" title="User:Berrucomons">berru</a>
CC BY-SA 3.0
self-made