Family: Asteraceae
basal-leaved rosinweed, prairie rosinweed, prairie-dock
[Silphium rumicifolium Small]
Christopher Noll
Kenneth J. Sytsma
University of Wisconsin - Madison (WIS-VP)
Etymology: Silphium: old Greek generic name referring to resinous juice
Plants: erect, perennial, 2'-10' tall forb; stems mostly leafless and smooth
Leaves: all large, basal, long stalked, rough, un-lobed but toothed, with a wide, heart-shaped base
Flowers: head 2"- 3 1/2" wide with about 13-21 yellow rays 3/4"-1" long, disk 1/2"- 1 1/2" wide; inflorescence of several to many heads in an open, branched cluster; blooms July-Sept.
Habitat: full sun; moderate moisture to wet; prairies; in sandy, loamy soil
Conservation Status: Native
Plants: erect, perennial, 2'-10' tall forb; stems mostly leafless and smooth
Leaves: all large, basal, long stalked, rough, un-lobed but toothed, with a wide, heart-shaped base
Flowers: head 2"- 3 1/2" wide with about 13-21 yellow rays 3/4"-1" long, disk 1/2"- 1 1/2" wide; inflorescence of several to many heads in an open, branched cluster; blooms July-Sept.
Habitat: full sun; moderate moisture to wet; prairies; in sandy, loamy soil
Conservation Status: Native
Flora of North America: Flora of North America Floristic Rating: Coefficient of Conservatism = 7, 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 USGS - Northern Prairie Wildlife Research Center: Wetland Plants and Plant Communities of Minnesota and Wisconsin 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"
Kenneth J. Sytsma
Janice Stiefel
Paul Drobot
Kitty Kohout
Eric J. Epstein
Robert W. Freckmann
Paul Drobot
Robert Bierman
Paul Drobot
Paul Drobot
Christopher Noll
