Blowball

noun

1. The downy head of the dandelion, salsify, etc., formed by the pappus after the blossom has fallen.
2. The downy seed head of a dandelion, which children delight to blow away.
3. The downy seed head of a dandelion, a dandelion clock.
4. any of several herbs of the genus Taraxacum having long tap roots and deeply notched leaves and bright yellow flowers followed by fluffy seed balls