Ageratina luciae-brauniae

Ageratina luciae-brauniae is a species of flowering plant in the aster family known by the common names Lucy Braun's snakeroot and rockhouse white snakeroot. It is native to the eastern United States, where it is limited to the Cumberland Plateau of Kentucky and Tennessee.[3][4] It may also occur in South Carolina but these reports are unconfirmed.[5]

Ageratina luciae-brauniae

Vulnerable  (NatureServe)
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Ageratina
Species:
A. luciae-brauniae
Binomial name
Ageratina luciae-brauniae
(Fernald) R.M.King & H.Rob.
Synonyms[1][2]

This perennial herb grows 30 to 60 centimeters tall. It has oppositely arranged leaves with thin oval or somewhat triangular blades up to 8 centimeters long by 9 wide. The inflorescence is a cluster of flower heads containing white disc florets and no ray florets.[6]

This plant grows in rockhouses, sandy spaces under overhangs of sandstone rock. It grows in moist places where water drips off the rock above.[3]

There are about 40[3] to 50[5] occurrences of the plant. Some populations in Kentucky are large but many are composed of just a few plants.[3]

Etymology

Ageratina is derived from Greek meaning 'un-aging', in reference to the flowers keeping their color for a long time. This name was used by Dioscorides for a number of different plants.[7]

This species was initially described in 1940 by American botanist Dr. Emma Lucy Braun, using the name Eupatorium deltoides.[8] This name turned out to have been used three times before,[2] so it needed to be replaced with a new name. Merritt Lyndon Fernald dubbed it Eupatorium luciae-brauniae after Dr. Braun (1889-1971).[9]

See also

References
  1. "Ageratina luciae-brauniae (Fernald) R.M.King & H.Rob.". The Global Compositae Checklist (GCC) – via The Plant List.
  2. The International Plant Names Index search for Eupatorium deltoideum
  3. Ageratina luciae-brauniae. The Nature Conservancy.
  4. "Ageratina luciae-brauniae". County-level distribution map from the North American Plant Atlas (NAPA). Biota of North America Program (BONAP). 2014.
  5. Ageratina luciae-brauniae. Archived October 26, 2011, at the Wayback Machine Center for Plant Conservation.
  6. Nesom, Guy L. (2006). "Ageratina luciae-brauniae". In Flora of North America Editorial Committee (ed.). Flora of North America North of Mexico (FNA). 21. New York and Oxford – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
  7. Gledhill, David (2008). "The Names of Plants". Cambridge University Press. ISBN 9780521866453 (hardback), ISBN 9780521685535 (paperback). pp 39
  8. Braun, Emma Lucy 1940. Rhodora 42(494): 50–51 description in Latin, commentary in English
  9. Fernald, Merritt Lyndon 1942. Rhodora 44(528): 463
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