beggar-ticks

noun, plural beg·gar-ticks. (used with a singular or plural verb)

1. any of several composite plants of the genus Bidens, having rayless yellow flowers and barbed achenes that cling to clothing.
2. the achenes of these plants.
3. any of several other plants having seeds or fruits that cling to clothing, as those of the genus Desmodium.

noun (functioning as singular)

1. any of various plants, such as the bur marigold and tick trefoil, having fruits or seeds that cling to clothing, fur, etc
2. the seed or fruit of any of these plants