Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Lamiids: Lamiales
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Collinsonia verticillata
FAMILY
Lamiaceae
Go to FSUS key
Dig deeper at SERNEC, a consortium of southeastern herbaria.
Read more about Whorled Horsebalm at Vascular Plants of North Carolina.
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Collinsonia verticillata
FAMILY
Lamiaceae
SYNONYMOUS WITH VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 164-33-003:
Collinsonia verticillata FAMILY Lamiaceae
SYNONYMOUS WITH Manual of the Southeastern Flora (Small, 1933, 1938)
Micheliella verticillata
COMMON NAME:
Whorled Horsebalm
To see larger pictures, click or hover over the thumbnails.
)
Gill Newberry gn04_c_verticillata
April
The inflorescence is usually unbranched, per Wildflowers of the Southern Mountains (Smith, 1998).
)
Jim Fanning jcf_horsebalms1
April Pickens County SC
SC Botanical Garden
)
JK Marlow jkm0404v_27b
April Pickens County SC
SC Botanical Garden
The middle lobe of the corolla's lower lip is long and lacerated, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
)
JK Marlow jkm120414_889
April Pickens County SC
Jocassee Gorges
The two pairs of opposite leaves, appearing whorled, are distinctive, per Guide to the Wildflowers of SC, 1st ed. (Porcher & Rayner, 2001).
)
JK Marlow jkm120414_890
April Pickens County SC
Jocassee Gorges
Thyrse narrow, rachis densely pilose with gland-tipped trichomes, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
)
JK Marlow jkm120414_952
April Pickens County SC
Jocassee Gorges
)
JK Marlow jkm220419_7001
April Pickens County SC
)
JK Marlow jkm220419_7003
April Pickens County SC
)
JK Marlow jkm220419_7013
April Pickens County SC
)
Richard and Teresa Ware rtw_c_verticillata_12
April
)
Richard and Teresa Ware rtw_c_verticillata_2
April
)
Sam Pratt sbp_20140428_122446
April Spartanburg County SC
In cultivation
)
Sam Pratt sbp_20140428_122703
April Spartanburg County SC
In cultivation
A 2-cleft long-exserted stigma and 4 long-exserted stamens, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
COMPARE
flowers of Horsebalm species
)
Sam Pratt sbp_20140428_122703b
April Spartanburg County SC
In cultivation
Calyx zygomorphic, 2-lipped and 5-toothed, 3-6mm long at anthesis, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
)
Keith Bradley kab_c_verticillata_6526
May Polk County NC
)
Keith Bradley kab_c_verticillata_6550
May Polk County NC
)
JK Marlow jkm170923_0566_2
September Pickens County SC
Jocassee Gorges
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Collinsonia verticillata
FAMILY
Lamiaceae
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Collinsonia verticillata
FAMILY
Lamiaceae
SYNONYMOUS WITH
VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 164-33-003:
Collinsonia verticillata
FAMILY
Lamiaceae
SYNONYMOUS WITH
Manual of the Southeastern Flora (Small, 1933, 1938)
Micheliella verticillata
353
Forb
Perennial
Habitat: Rich forests, ranging from moist (cove) forests to rather dry oak forests over mafic or calcareous rocks, per Weakley's Flora
Native to the Carolinas & Georgia
Uncommon in GA Mountains (rare elsewhere in GA-NC-SC)
CLICK HERE to see a map, notes, and images from Weakley's Flora of the Southeastern US.
Click here to see a map showing all occurrences known to SERNEC, a consortium of southeastern herbaria. (Zoom in to see more detail.)
LEAVES:
Simple
Opposite appearing whorled
FLOWER:
Spring/Summer
Lavender/Purplish
Bilaterally symmetrical
2-lipped calyx
2-lipped 5-lobed corolla
4 long-exserted stamens
Superior ovary
Bisexual
FRUIT:
Summer
Schizocarp of mericarps
TO LEARN MORE about this plant, look it up in a good book!
- Guide to the Wildflowers of SC, 1st ed. (Porcher & Rayner, 2001) p180
- Guide to the Wildflowers of SC, 2nd ed. (McMillan, Porcher, Rayner, & White; 2022) p138
- Field Guide to the Wildflowers of Georgia (Chafin, 2016) p232
- Wildflowers of Tennessee (Carman, 2005) p218
- Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005) p259
- Wildflowers of the Southern Mountains (Smith, 1998) p146
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