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Whorled Horsebalm, Early Stoneroot - Collinsonia verticillata


Family: Lamiaceae - Mint family Genus Common Name: Horsebalm Native Status: NativeDicot Perennial Herb
Collinsonia verticillata - Whorled Horsebalm, Early Stoneroot. Collinsonia currently has 4 recognized species, although there have been as many as 10 in the past. This implies significant variation within some species.

Found in nine mostly southeastern states (AL, FL, GA, KY, NC, OH, SC, TN, VA), Collinsonia verticillata is listed as endangered in Ohio and Kentucky.

Found in:
AL, FL, GA, KY, NC, OH, SC, TN, VA

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Collinsonia verticillata

Distribution of Collinsonia verticillata 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, 17 Oct 2017). National Plant Data Team, Greensboro, NC 27401-4901 USA.

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Site: Lookout Mountain, Hamilton County, TN Date: 2011-April-25Photographer: Gerald C. Williamson
Nikon D7000
Tamron SP 90MM f/2.8 AF Macro
The blossoms of Whorled Horse Balm are in groups of 3 to 6 at each node in the inflorescense.
Collinsonia verticillata

Site: Lookout Mountain, Hamilton County, TN Date: 2011-April-25Photographer: Gerald C Williamson
Nikon D7000
Tamron SP 90MM f/2.8 AF Macro
The blossoms of Whorled Horsebalm have 4 stamens on distinctively long filaments. The inflorescence is covered with glandular hairs. The lower lip of the corolla is fringed.
Click on the photo for a larger image
Collinsonia verticillata

Site: Lookout Mountain, Hamilton County, TN Date: 2011-April-25Photographer: Gerald C Williamson
Nikon D7000
Tamron SP 90MM f/2.8 AF Macro
Whorled Horsebalm is usually 1 to 2 feet tall, with large, opposite, toothed leaves borne on a petiole.
Click on the photo for a larger image
Collinsonia verticillata

Site: Lookout Mountain, Hamilton County, TN Date: 2011-April-25Photographer: Gerald C Williamson
Nikon D7000
Tamron SP 90MM f/2.8 AF Macro
The top two pairs of opposing leaves are carried so closely together that they may appear to be a whorl rather than opposing, giving the plant the Whorled common name.
Click on the photo for a larger image
Collinsonia verticillata

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