How do sticky and branched stigmas help wind-pollinated plants catch pollen?

In wind-pollinated plants, the stigma is adapted to overcome the inherent inefficiency of anemophily, where pollen is dispersed randomly through the air. Because wind pollination is a wasteful process with a low statistical probability of a pollen grain successfully landing on a receptive surface, these plants have evolved specific structural adaptations to maximize their chances of capture.1

The stigmas of wind-pollinated flowers are often long and divided into arms or lobes, which creates a significantly larger surface area for intercepting airborne pollen grains. Furthermore, these stigmas are frequently branched and covered with sticky trichomes. This combination of a large, branched structure and a sticky surface acts as a trap, increasing the likelihood that passing pollen will adhere to the stigma upon contact. By providing a broad, adhesive target, the plant compensates for the lack of precision in wind-based dispersal, ensuring that even sparse amounts of pollen can be effectively collected for germination.12