Robert W. Freckmann Herbarium


  Bidens coronata (L.) Britton image
Photographer: Merel R. Black           

Kenneth J. Sytsma

Kenneth J. Sytsma

Merel R. Black

Robert W. Freckmann

Robert W. Freckmann

Josh Sulman

Josh Sulman

Josh Sulman

Josh Sulman
Family Asteraceae
Bidens coronata (L.) Britton
northern tickseed-sunflower, tall swamp marigold
Bidens: derived from Latin bis, "twice," and dens, "tooth," hence meaning "2-toothed" and referring to the bristles on the achenes
coronata: of crowns
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Native
Plant: erect, annual/biennial, 6"-60" tall, smooth forb
Flower: head 1 1/2"-2 1/2" wide with 8 yellow rays 1/2"-1" long, leafy bracts usually shorter than the 1/3"-1/2" wide disk; inflorescence of a few long-stalked heads; blooms Aug.-Oct.
Fruit:dry, dark, with 2- bristly awns, mostly flat, 2 1/2 to 4 times as long as wide fruit drawing
Leaf:pinnately-divided into 3-7 lance-like, pointed segments
Habitat: wet; meadows, marshes, shores
(Glossary)

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

Flora of North America (off site)
Synonyms 
Bidens coronata (L.) Britton var. brachyodonta Fernald
Bidens coronata (L.) Britton var. tenuiloba (A.Gray) Sherff
Bidens coronata (L.) Britton var. trichosperma (Michx.) Fernald
Bidens trichosperma (Michx.) Britton
Coreopsis trichosperma Michx.
Coreopsis trichosperma Michx. var. tenuiloba A.Gray

         
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