Wildflowers of the United States

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.

Distribution of Silphium mohrii in the United States and Canada:
USDA Plants Distribution Map

Blue=Native; Grey=Introduced

Map from USDA Plants Database:
USDA, NRCS. 2009. The PLANTS Database (http://plants.usda.gov, 08 Sep 2010). National Plant Data Center, Baton Rouge, LA 70874-4490 USA.
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Site: Dade County, Ga Date: 2010-July-05	Photographer: Gerald C. Williamson
Shaggy Rosinweed has around 14 pale yellow ray flowers, with numerous yellow disk flowers.

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

Click on the photo for a larger image

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All content except USDA Plants Database map Copyright Gerald C. Williamson 2010
Photographs Copyrighted by the named photographer

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