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Wright's snakeroot

lucy Braun's snakeroot, rockhouse white snakeroot

Habit Shrubs, 50–150 cm. Perennials, 30–60 cm.
Stems

erect, puberulous.

erect, glabrous.

Leaves

opposite proximally, alternate on distal 1/3–1/2 of stem;

petioles narrowly winged, 3–5(–8) mm;

blades ovate to deltate-ovate, mostly 1–2 × 0.5–1.5(–2) cm, bases truncate to cuneate or attenuate, margins entire or shallowly crenate, apices acute to blunt or obtuse, abaxial faces gland-dotted.

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, puberulent.

1–3 mm, glabrous or sparsely puberulent.

Involucres

3.5–4.5 mm.

3.5–4 mm.

Corollas

pinkish white to pink, glabrous.

white, lobes glabrous or sparsely puberulent.

Phyllaries

apices acute, abaxial faces puberulent.

apices acuminate, abaxial faces glabrous or sparsely puberulent.

Heads

clustered.

clustered.

Cypselae

sparsely hispidulous.

sparsely and evenly hirtellous.

2n

= 34.

Ageratina wrightii

Ageratina luciae-brauniae

Phenology Flowering (Jul–)Aug–Oct(–Nov). Flowering Aug–Oct.
Habitat Limestone slopes, ledges, alluvium, in brushy vegetation Under overhanging sandstone (Pottsville formation) cliffs and ledges
Elevation 1300–2200 m (4300–7200 ft) 400–500 m (1300–1600 ft)
Distribution
from FNA
AZ; NM; TX; Mexico
[WildflowerSearch map]
[BONAP county map]
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. 552. FNA vol. 21, p. 550.
Parent taxa Asteraceae > tribe Eupatorieae > Ageratina Asteraceae > tribe Eupatorieae > Ageratina
Sibling taxa
A. adenophora, A. altissima, A. aromatica, A. havanensis, A. herbacea, A. jucunda, A. lemmonii, A. luciae-brauniae, A. occidentalis, A. paupercula, A. rothrockii, A. shastensis, A. thyrsiflora
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 wrightii Eupatorium luciae-brauniae
Name authority (A. Gray) R. M. King & H. Robinson: Phytologia 19: 228. (1970) (Fernald) R. M. King & H. Robinson: Phytologia 19: 215. (1970)
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