Family Code: ASTERA Genus Code: BIDEN Genus CN: beggarticks Genus Authority: L. Genus Summary: A genus of about 240 species, herbs, cosmopolitan. Recent molecular studies suggest that the relationship between Bidens and Coreopsis is complex, and that changes in taxonomy will be needed to more accurately reflect relationships (Kim et al. 1999; Crawford & Mort 2005). Genus Identification: Identification notes: The involucre of phyllaries is subtended by an additional series of bracteal structures, the calyculus. Genus References: Strother & Weedon in FNA (2006c); Cronquist (1980)=SE; Sherff & Alexander (1955)=Z; Ballard (1986)=Y. Key based on FNA. Last Updated: 2019-11-29 Publish: 1