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Bearded Beggarticks, Tickseed Sunflower, Bur Marigold - Bidens aristosa


Family: Asteraceae - Aster family Genus Common Name: Beggarticks Native Status: NativeDicot Annual Biennial Herb
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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Bidens aristosa

Distribution of Bidens aristosa in the United States and Canada:
Map unavailable.
Map courtesy of The Biota of North America Program.
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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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Bidens aristosa initially published on USWildflowers.com 2009-09-02; Updated 2015-06-24

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All content except USDA Plants Database map Copyright Gerald C. Williamson 2024
Photographs Copyright owned by the named photographer



Code Update 20230302