bur marigold or sticktight, common name for any species of Bidens, a genus of chiefly weedy North American plants of the family Asteraceae ( aster family) with two-pronged burlike fruits (achenes) that have gained various species such additional names as beggar-ticks, Spanish needles, tickseed, and bootjacks. A few showy yellow-flowered species are occasionally cultivated. Many of the common names are also used for other weeds with burs. Bur marigold is classified in the division Magnoliophyta , class Magnoliopsida, order Asterales, family Asteraceae.
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.
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