CPC Plant Profile: Whorled Horsebalm
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Plant Profile

Whorled Horsebalm (Collinsonia verticillata)

A closeup view of the flower of this rare mint. Photo Credit: Brian Parsons
Description
  • Global Rank: G3 - Vulnerable
  • Legal Status: N/A
  • Family: Lamiaceae
  • State: VA, AL, GA, KY, MD, NC, OH, SC, TN
  • Nature Serve ID: 144678
  • Date Inducted in National Collection: 04/01/1990

Collinsonia verticillata is a woodland herb that grows from a hard, thickened rhizome. It produces flowers that range in color from white to pink and lavender in May and April. It produces fruit in June and July. There are 2-3 pairs of leaves, and unbranched inflorescence. It flowers with 4 stamens. The U.S. Forest Service, due to its limited range in the Southern Appalachian Mountains, has listed it as Sensitive. Very little is known about this species, although researchers have been able to successfully transplant mature plants to regional botanic gardens and arboreta for observation.

Participating Institutions
Updates
  • 09/03/2020
  • Propagation Research

Seed germination studies--little to nothing is known currently. A.L. Fone studied seed output in various plant forms of this species in the 1980's.

  • 09/03/2020
  • Genetic Research

Jess Peirson, an Ohio University graduate student, is studying the genus to verify the current species classification using morphology and DNA.

Nature Serve Biotics
  • 05/02/2017

Collinsonia verticillata can be locally abundant but is scattered and infrequent throughout its range.

Lindsey Parsons
  • 01/01/2010

Opening of canopy through logging Habitat destruction by road and residential construction (Jess Peirson personal communication)

Lindsey Parsons
  • 01/01/2010

Unknown, but field studies of populations in Georgia, Tennessee and Ohio in spring of 2001 showed that those populations were healthy. (Jess Peirson personal communication)

Lindsey Parsons
  • 01/01/2010

Jess Peirson, an Ohio University graduate student, is studying the genus to verify the current species classification using morphology and DNA. A.L. Fone studied seed output in various plant forms of this species in the 1980's.

Lindsey Parsons
  • 01/01/2010

None known.

Lindsey Parsons
  • 01/01/2010

General ecological, demographic and genetic variability research would be useful for this taxon.

Lindsey Parsons
  • 01/01/2010

Seed germination studies--little to nothing is known currently.

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Photos
Nomenclature
Taxon Collinsonia verticillata
Authority Baldw. ex Elliot
Family Lamiaceae
CPC Number 6182
ITIS 32476
USDA COVE3
Common Names early stoneroot | whorled horse-balm | whorled stoneroot | stoneroot
Associated Scientific Names Collinsonia verticillata | Hypogon verticillata | Micheliella verticillata | Hypogon verticillatus | Collinsonia verticillata var. purpurascens | Hypogon verticillatum
Distribution Georgia, Kentucky, North Carolina, Ohio, South Carolina, Tennessee, Virginia (NatureServe 2001).
State Rank
State State Rank
Alabama SNR
Georgia S3
Kentucky S1?
Maryland SNR
North Carolina S2
Ohio S1
South Carolina S3
Tennessee S2S3
Virginia S1
Habitat

Mixed mesophytic and cove forests of the southern Appalachians and occasionally in other habitats with extremely rich soil (Jess Peirson personal communication).

Ecological Relationships

None known.

Pollinators
Common Name Name in Text Association Type Source InteractionID

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