Flora of North America species comparison

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Ageratina aromatica

Ageratina luciae-brauniae

lesser snakeroot, small-leaf white snakeroot

lucy Braun's snakeroot, rockhouse white snakeroot
Habit Perennials, 30–80(–100) cm. Perennials, 30–60 cm.
Stems

erect, villous-puberulent.

erect, glabrous.
Leaves

opposite;

petioles 1–8(–12) mm;

blades narrowly to broadly deltate to nearly ovate or lanceolate, 2–7(–9) × 1.5–4 cm, (usually subcoriaceous) bases rounded or truncate to barely cuneate or subcordate, margins usually crenate, sometimes crenate-serrate to dentate or subentire, apices acute to obtuse, faces minutely pilose.

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

2–9 mm, densely and closely puberulent.

1–3 mm, glabrous or sparsely puberulent.
Involucres

3.5–5 mm.

3.5–4 mm.
Corollas

white, lobes sparsely villous.

white, lobes glabrous or sparsely puberulent.
Phyllaries

apices acute, abaxial faces puberulent to villous-puberulent.

apices acuminate, abaxial faces glabrous or sparsely puberulent.
Heads

clustered.

clustered.
Cypselae

usually glabrous or sparsely puberulent (near apices), rarely hirtellous on angles.

sparsely and evenly hirtellous.
2n

= 34.

= 34.

Ageratina aromatica

Ageratina luciae-brauniae
Phenology Flowering late Aug–Oct(–Nov). Flowering Aug–Oct.
Habitat Sandy soils, burned pinelands, turkey oak sand ridges, pine-oak and oak-hickory upland woods, old fields, roadsides, fencerows, moist sites Under overhanging sandstone (Pottsville formation) cliffs and ledges
Elevation 100–900 m (300–3000 ft) 400–500 m (1300–1600 ft)
Distribution
from FNA
AL; CT; DE; FL; KY; LA; MA; MD; MS; NC; NJ; NY; OH; PA; RI; SC; TN; VA; WV
[WildflowerSearch map]
[BONAP county map]
from FNA
KY; TN
[BONAP county map]
Discussion

Intergrades (probable hybrids) between Ageratina aromatica and A. altissima were identified by A. F. Clewell and J. W. Wooten (1971) over a broad area of their sympatry. They also found intergrades between A. aromatica and A. jucunda where their ranges meet.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

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. FNA vol. 21, p. 550.
Parent taxa Asteraceae > tribe Eupatorieae > Ageratina Asteraceae > tribe Eupatorieae > Ageratina
Sibling taxa
A. adenophora, A. altissima, A. havanensis, A. herbacea, A. jucunda, A. lemmonii, A. luciae-brauniae, A. occidentalis, A. paupercula, A. rothrockii, A. shastensis, A. thyrsiflora, A. wrightii
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 aromaticum, Eupatorium latidens Eupatorium luciae-brauniae
Name authority (Linnaeus) Spach: Hist. Nat. Vég. 10: 286. (1841) (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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