Which feature is absent from wind-pollinated flowers?

1. Most conifers and many angiosperms such as grasses, maples and oaks are wind pollinated. 2. Their flowers are usually green and small, with small petals or none at all. 3. They produce large amounts of lightweight pollen, and the microsporangia hang out of the flower so the wind can carry it. 4. The pollen is caught on an exposed feathery stigma. 5. Unlike insect pollinated flowers, they do not produce nectar or scent, since there is no animal to reward. 6. Their flowers usually emerge early in spring before the leaves, so foliage does not block the movement of the wind. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 32 "Plant Reproduction", section 32.2 Pollination and Fertilization_