Robert W. Freckmann Herbarium


Because of technology changes and personnel changes at UWSP and the Wisconsin State Herbarium, the database of plant species housed at this site was merged with the database from the OLD WisFlora website to create a new Flora of Wisconsin website at Currently we are encouraging all Wisplant viewers to begin using the Flora of Wisconsin website as soon as possible. Wisplants will remain operational through July 13th. After that date, all traffic to Wisplants will be redirected to the Flora of Wisconsin website.

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  Bidens comosa (A.Gray) Wiegand image
Photographer: Emmet J. Judziewicz           

Botanical Illustration

Botanical Illustration

Botanical Illustration

Emmet J. Judziewicz
Family Asteraceae
Bidens comosa (A.Gray) Wiegand
straw-stem beggar-ticks, swamp marigold, swamp tickseed
Bidens: derived from Latin bis, "twice," and dens, "tooth," hence meaning "2-toothed" and referring to the bristles on the achenes
comosa: hairy
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Native
Plant: erect, annual, 4"-80" tall, mostly smooth forb with straw-colored stems
Flower: head with or without 1 1/2" rays, pale yellow to greenish disk 1/3"-3/4" wide, leafy bracts usually longer than the disk; inflorescence of a few stalked, erect heads; blooms Aug.-Oct.
Fruit:usually with 3 barbed awns (the center one shortest), smooth except for the edges of the barbs, very flat fruit drawing
Leaf:mostly stalkless, usually toothed, simple but with 1-4 lobes near the base
Habitat: moist to wet; disturbed areas
Notes: similar to B. connatus; differing in stem and disk color and fruit.

More Information Natural Communities Herbarium Specimens
All Bidens list Google- Images or Text

Flora of North America (off site)
Bidens acuta (Wiegand) Britton
Bidens comosa (A.Gray) Wiegand var. acuta Wiegand
Bidens tripartita L., sensu Kartesz (1994)

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