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Bearded Beggarticks, Tickseed Sunflower, Bur Marigold - Bidens aristosa


Family: Asteraceae Aster family Genus Common Name: Beggarticks Native Status: Native
Bidens aristosa - Bearded Beggarticks, Tickseed Sunflower, Bur Marigold. Beautiful multi-branched, multi-blossomed flower seen in late summer along roads and fields. The specimens presented here probably would have been classified as B. polylepis prior to a 1977 Arkansas study which determined the primary differentiator between the two "species" - the number of calyx lobes - was a factor of the size of the plant within a colony, with the larger plants having B. polylepis characteristics and the shorter plants having B. aristosa characteristics. Since B. aristosa was an older classification, most authorities have merged B. polylepis into B. aristosa.

Found in:
AL, AR, CO, CT, DC, DE, GA, IA, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, NC, NE, NH, NJ, NY, OH, OK, PA, SC, TN, TX, VA, WI, WV

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Distribution of Bidens aristosa in the United States and Canada:
USDA Plants Distribution Map temporarily unavailable.
Blue=Native; Grey=Introduced

Map from USDA Plants Database:
USDA, NRCS. 2009. The PLANTS Database (http://plants.usda.gov, 22 Aug 2014). National Plant Data Center, Baton Rouge, LA 70874-4490 USA.

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Site: Walker County, Ga Date: 2009-August-31Photographer: Gerald C Williamson
Typical aster blossom with both ray and disk flowers. 7 or 8 ray flowers is typical. Count of the calyx lobes on the bud would have placed this as B. polylepis in the past.
Bidens aristosa

Site: Walker County, Ga Date: 2009-August-31Photographer: Gerald C Williamson
Bidens aristosa colonies can grow quite large. The plants are usually multi-branched, and the larger ones may have many blossoms at the same time.
Click on the photo for a larger image
Bidens aristosa

Site: Walker County, Ga Date: 2009-August-31Photographer: Gerald C Williamson
Pinnately-divided leaf on Bidens aristosa, with leaflets elongated and toothed.
Click on the photo for a larger image
Bidens aristosa

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All content except USDA Plants Database map Copyright Gerald C. Williamson 2014
Photographs Copyrighted by the named photographer