Kentucky Nature Preserves Rare Plants

Kentucky State Nature Preserves Commission

Whorled Horse-balm
Collinsonia verticillata
Family: Lamiaceae

Protection Status:
State Status:  E
USFWS Status: {null}

Global Rank: G3G4
State Rank: S1?

Rich forests, ranging from moist forests to rather dry oak forests (Weakley 1998).

Species Description:
Perennial herb.

Flowering Period: Mid April to mid June.
Fruiting Period: Early June to late July.

Additional Information at NatureServe

Diagnostic Characteristics:
Herbaceous mint with opposite, ovate-oblong (to 20 cm) leaves in 2 to 3 pairs, usually near the base of the inflorescence, giving a whorled apppearance. The pink-tinged flowers (0.6-0.8 inches long) are in a single terminal panicle. They are bilabiate (two-lipped) and the lower lip is fringed; four stamens present. It flowers earlier than C. canadensis (Apr-Jun versus Jul-Sep) and it can extend into drier woods (Campbell, 2012).

Avoid changes in moisture/hydrologic conditions at the site. Changes could result from overstory removal, stream/wetland alteration or impacts due to erosion. Exotic pest plants are a threat to this species. Avoid creating access to the site through trail or road construction.

Global Range:

Known Kentucky Occurrences:

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Data last updated: Wednesday, May 28, 2014
Kentucky State Nature Preserves Commission
801 Teton Trail
Frankfort,KY 40601
Phone: (502) 573-2886
Fax: (502) 573-2355
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