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Mohr's Rosinweed, Shaggy Rosinweed - Silphium mohrii


Family: Asteraceae - Aster family Genus Common Name: Rosinweed Native Status: Native
Silphium mohrii - Mohr's Rosinweed, Shaggy Rosinweed. Description: Very hairy plant to 6 feet tall, found in only a few counties in Alabama, Georgia, and Tennessee.

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Silphium mohrii

Distribution of Silphium mohrii in the United States and Canada:
USDA Plants Distribution Map temporarily unavailable.
Blue=Native; Grey=Introduced

Map from USDA Plants Database:
USDA, NRCS. 2017. The PLANTS Database (http://plants.usda.gov, 28 Apr 2017). National Plant Data Team, Greensboro, NC 27401-4901 USA.

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Site: Dade County, Ga Date: 2010-July-05Photographer: Gerald C. Williamson
Shaggy Rosinweed has around 14 pale yellow ray flowers, with numerous yellow disk flowers.
Silphium mohrii

Site: Dade County, GA Date: 2010-July-05Photographer: Gerald C Williamson
Nikon D60
Tamron SP 90MM f/2.8 AF Macro
Shaggy Rosinweed has a very hairy stem and hairy, alternate leaves. The lower leaves are on long petioles.
Click on the photo for a larger image
Silphium mohrii

Site: Dade County, GA Date: 2010-July-05Photographer: Gerald C Williamson
Nikon D60
Upper leaves are nearly sessile, usually with a very short petiole.
Click on the photo for a larger image
Silphium mohrii

Site: Dade County, GA Date: 2010-July-05Photographer: Gerald C Williamson
Nikon D60
Click on the photo for a larger image
Silphium mohrii

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All content except USDA Plants Database map Copyright Gerald C. Williamson 2017
Photographs Copyright owned by the named photographer