Lucy Braun's White Snakeroot - Center For Plant Conservation
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Plant Profile

Lucy Braun's White Snakeroot (Ageratina luciae-brauniae)

Close-up of thin-stemmed plant with white aster flowers. Photo Credit: Kimberlie McCue
  • Global Rank: G3 - Vulnerable
  • Legal Status: N/A
  • Family: Asteraceae
  • State: KY, SC, TN
  • Nature Serve ID: 157854
  • Date Inducted in National Collection: 02/10/1987

Lucy Braun's snakeroot is closely related to several familiar plant species: thoroughworts, boneset, Joe-pye-weed, and white snakeroot. The last-mentioned, when eaten by cows, was the Midwestern source of the deadly milk sickness, which also plagued early settlers and killed Abraham Lincoln's mother. Ageratina luciae-brauniae is a shy member of the genus, living under rock overhangs where its greatest immediate threat is trampling by rock climbers.

Where is Lucy Braun's White Snakeroot (Ageratina luciae-brauniae) located in the wild?


Shaded wet sandstone, ledges and overhangs (Kral 1983).


Eastern Kentucky, north-central Tennessee, and parts of South Carolina (Campbell et al. 1994).

States & Provinces:

Lucy Braun's White Snakeroot can be found in Kentucky, South Carolina, Tennessee

Which CPC Partners conserve Lucy Braun's White Snakeroot (Ageratina luciae-brauniae)?

CPC's Plant Sponsorship Program provides long term stewardship of rare plants in our National Collection. We are so grateful for all our donors who have made the Plant Sponsorship Program so successful. We are in the process of acknowledging all our wonderful plant sponsorship donors on our website. This is a work in progress and will be updated regularly.

Conservation Actions

  • 08/16/2020
  • Propagation Research

Germination requirements have been studied and compared with more common species (Walck et al. 1997)

Nature Serve Biotics
  • 05/02/2017

40 estimated element occurrences, relatively low abundance numbers at most sites, some protection but fragile and subject to destruction.

Kimberlie McCue, Ph.D.
  • 01/01/2010

Primary threat is trampling by hikers and rock climbers (Campbell 1994).

Kimberlie McCue, Ph.D.
  • 01/01/2010

Between 40 and 50 sites in total. Number of individuals is low at any given site (Campbell et al. 1994).

Kimberlie McCue, Ph.D.
  • 01/01/2010

Germination requirements have been studied and compared with more common species (Walck et al. 1997)

Kimberlie McCue, Ph.D.
  • 01/01/2010

There is no formal, centralized management plan.

Kimberlie McCue, Ph.D.
  • 01/01/2010

Management needs include protection from trampling. Research needs include understanding aspects of reproductive biology and ecology, seedling establishment and habitat requirements.

Kimberlie McCue, Ph.D.
  • 01/01/2010

Not Available


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Taxon Ageratina luciae-brauniae
Authority (Fern.) King & H.E. Robins.
Family Asteraceae
CPC Number 1855
ITIS 36472
Common Names Braun's thoroughwort | Lucy Braun's snakeroot | Lucy Braun's white snakeroot
Associated Scientific Names Ageratina luciae-brauniae | Eupatorium luciae-brauniae
Distribution Eastern Kentucky, north-central Tennessee, and parts of South Carolina (Campbell et al. 1994).
State Rank
State State Rank
Kentucky S3
South Carolina S1S2
Tennessee S3
Ecological Relationships

Ecological relationships are unknown, however this species is often associated with Heuchera villosa and Silene rotundifolia (Kral 1983, Campbell 1994).


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