Flora of North America species comparison

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Ageratina wrightii

Ageratina aromatica

Wright's snakeroot

lesser snakeroot, small-leaf white snakeroot
Habit Shrubs, 50–150 cm. Perennials, 30–80(–100) cm.
Stems

erect, puberulous.

erect, villous-puberulent.
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 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.
Peduncles

1–3 mm, puberulent.

2–9 mm, densely and closely puberulent.
Involucres

3.5–4.5 mm.

3.5–5 mm.
Corollas

pinkish white to pink, glabrous.

white, lobes sparsely villous.
Phyllaries

apices acute, abaxial faces puberulent.

apices acute, abaxial faces puberulent to villous-puberulent.
Heads

clustered.

clustered.
Cypselae

sparsely hispidulous.

usually glabrous or sparsely puberulent (near apices), rarely hirtellous on angles.
2n

= 34.

Ageratina wrightii

Ageratina aromatica
Phenology Flowering (Jul–)Aug–Oct(–Nov). Flowering late Aug–Oct(–Nov).
Habitat Limestone slopes, ledges, alluvium, in brushy vegetation Sandy soils, burned pinelands, turkey oak sand ridges, pine-oak and oak-hickory upland woods, old fields, roadsides, fencerows, moist sites
Elevation 1300–2200 m (4300–7200 ft) 100–900 m (300–3000 ft)
Distribution
from FNA
AZ; NM; TX; Mexico
[WildflowerSearch map]
[BONAP county map]
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]
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.)
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. havanensis, A. herbacea, A. jucunda, A. lemmonii, A. luciae-brauniae, A. occidentalis, A. paupercula, A. rothrockii, A. shastensis, A. thyrsiflora, A. wrightii
Synonyms Eupatorium wrightii Eupatorium aromaticum, Eupatorium latidens
Name authority (A. Gray) R. M. King & H. Robinson: Phytologia 19: 228. (1970) (Linnaeus) Spach: Hist. Nat. Vég. 10: 286. (1841)
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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