beggar-ticks

from the GNU version of the Collaborative International Dictionary of English.

• noun the seed of bur marigolds.
• noun any of several plants of the genus Bidens having yellow flowers and pricky fruits that cling to fur and clothing; -- also called beggar's-ticks.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any of several plants, of the genus Bidens, having yellow flowers and prickly fruit.
• noun The barbed fruit of these plants, that sticks to clothing and to animal fur.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the seed of bur marigolds
• noun any of several plants of the genus Bidens having yellow flowers and prickly fruits that cling to fur and clothing