Family: Asteraceae
black-eyed Susan
[Rudbeckia bicolor Nutt., more...]
Merel R. Black
Merel R. Black
University of Wisconsin - Madison (WIS-VP)
Etymology: Rudbeckia: named after the Swedish father and son who were professors of botany and predecessors of Linnaeus, O.J. Rudbeck (1630-1702) and O.O. Rudbeck (1660-1740)
Plants: erect, biennial/perennial, 1'-3' tall, very hairy forb
Leaves: either entire or with fine teeth, lower leaves lance-like up to 1" wide and 5 times as long, the upper becoming more linear
Flowers: head 2"-3" wide; dark brown, domed disk 1/2"-3/4" wide; 8-21 yellow, 3/4"- 1 1/2" long rays, bracts (phyllaries) with coarse hairs; inflorescence with a long-stalked, solitary heads; blooms June-Oct.
Fruits: dry seed with no fluffy pappus
Habitat: full to partial sun; dry, moderate moisture to wet; prairies, meadows, roadsides; in sandy, loamy soil
Hazardous: Careful, this plant is hazardous!
Conservation Status: Native
Plants: erect, biennial/perennial, 1'-3' tall, very hairy forb
Leaves: either entire or with fine teeth, lower leaves lance-like up to 1" wide and 5 times as long, the upper becoming more linear
Flowers: head 2"-3" wide; dark brown, domed disk 1/2"-3/4" wide; 8-21 yellow, 3/4"- 1 1/2" long rays, bracts (phyllaries) with coarse hairs; inflorescence with a long-stalked, solitary heads; blooms June-Oct.
Fruits: dry seed with no fluffy pappus
Habitat: full to partial sun; dry, moderate moisture to wet; prairies, meadows, roadsides; in sandy, loamy soil
Hazardous: Careful, this plant is hazardous!
Conservation Status: Native
Flora of North America: Flora of North America Floristic Rating: Coefficient of Conservatism = 4, Wetland Indicator = FACU Atlas of the Wisconsin Prairie and Savanna Flora: by T.S. Cochrane & H.H. Iltis: habitat, distribution infomation / flowering and fruiting times USDA Plants Database: Federal Distribution and detailed information including photos Dan Tenaglia's The Missouri Flora: Fabulous photographs; detailed descriptions; color and leave arrangement key. David G. Smith's "Delaware Wilflowers": Beautiful photographs; descriptions Illinois Wildflowers: Wonderful photographs; detailed descriptions; color and leaf arrangement key Southwest School of Botanical Medicine: Britton & Brown Illustrated Flora - 2nd Edition (1913) "An Illustrated Flora of the Northern United States and Canada"
Merel R. Black
Merel R. Black
Paul Drobot
Robert R. Kowal
Matthew L. Wagner
Matthew L. Wagner
Kenneth J. Sytsma
Richard Bauer
Paul Drobot
Caroline A. Creevey
Botanical Illustration
Botanical Illustration
Botanical Illustration
