Family: Asteraceae
prairie rosinweed, whole-leaf rosinweed
Merel R. Black
Merel R. Black
Etymology: Silphium: old Greek generic name referring to resinous juice
Plants: erect, perennial, 2'-6' tall forb; stems leafy, cylindrical in X-section
Leaves: mostly opposite but not surrounding the stem, lower and upper leaves about the same size
Flowers: head 2"-3" wide with 16-33 (usually 21 or 34) yellow rays 3/4"-1" long; disk usually 1/2"-1" wide; inflorescence of many heads in large, branched clusters; blooms July-Sept.
Fruits: dry seed with no fluffy pappus
Habitat: full sun; dry, moderate moisture to wet; prairies, meadows; in sandy, loamy soil
Plants: erect, perennial, 2'-6' tall forb; stems leafy, cylindrical in X-section
Leaves: mostly opposite but not surrounding the stem, lower and upper leaves about the same size
Flowers: head 2"-3" wide with 16-33 (usually 21 or 34) yellow rays 3/4"-1" long; disk usually 1/2"-1" wide; inflorescence of many heads in large, branched clusters; blooms July-Sept.
Fruits: dry seed with no fluffy pappus
Habitat: full sun; dry, moderate moisture to wet; prairies, meadows; in sandy, loamy soil
Floristic Rating: Coefficient of Conservatism = 6 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. 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
Kenneth J. Sytsma
Christopher Noll
Merel R. Black
Merel R. Black
Margery Melgaard
Robert R. Kowal
Paul Drobot
Hugh H. Iltis
Paul Drobot
Paul Drobot
Aaron_Carlson
Paul Drobot
Aaron_Carlson
Paul Drobot
Aaron_Carlson
Aaron_Carlson
Aaron Carlson
Christopher Noll
Aaron_Carlson
Aaron Carlson
