Flora of North America species comparison

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Ageratina luciae-brauniae

lucy Braun's snakeroot, rockhouse white snakeroot
Habit Perennials, 30–60 cm.
Stems

erect, glabrous.
Leaves

opposite;

petioles 25–70 mm;

blades broadly ovate-deltate, 4–8 × 5–9 cm, (thin, delicate) bases truncate to subcordate, margins coarsely dentate, apices acute to acuminate, abaxial faces glabrous or sparsely puberulent.
Peduncles

1–3 mm, glabrous or sparsely puberulent.
Involucres

3.5–4 mm.
Corollas

white, lobes glabrous or sparsely puberulent.
Phyllaries

apices acuminate, abaxial faces glabrous or sparsely puberulent.
Heads

clustered.
Cypselae

sparsely and evenly hirtellous.
2n

= 34.

Ageratina luciae-brauniae
Phenology Flowering Aug–Oct.
Habitat Under overhanging sandstone (Pottsville formation) cliffs and ledges
Elevation 400–500 m (1300–1600 ft)
Distribution
from FNA
KY; TN
[BONAP county map]
Discussion

Ageratina luciae-brauniae was treated by A. F. Clewell and J. W. Wooten (1971) as a synonym of A. altissima and regarded by them as “bizarre plants showing extreme signs of etiolation from growing under limestone ledges” (p. 134). B. E. Wofford (1976) observed that greenhouse transplants of both species maintained distinctions that provide rationale for maintaining A. luciae-brauniae at specific rank.

Ageratina luciae-brauniae is in the Center for Plant Conservation’s National Collection of Endangered Plants.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 21, p. 550.
Parent taxa Asteraceae > tribe Eupatorieae > Ageratina
Sibling taxa
A. adenophora, A. altissima, A. aromatica, A. havanensis, A. herbacea, A. jucunda, A. lemmonii, A. occidentalis, A. paupercula, A. rothrockii, A. shastensis, A. thyrsiflora, A. wrightii
Synonyms Eupatorium luciae-brauniae
Name authority (Fernald) R. M. King & H. Robinson: Phytologia 19: 215. (1970)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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