Ageratina aromatica
Ageratina altissima
lesser snakeroot, small-leaf white snakeroot
white snakeroot
erect, villous-puberulent.
ascending to erect, sometimes semiscandent, puberulent (hairs minute, crisped).
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 (5–)10–30(–50) mm;
blades usually deltate-ovate to ovate or broadly lanceolate, sometimes ovate-lanceolate, 4–11(–13) × 2.5–8(–9) cm, bases usually rounded to truncate or obtuse, sometimes cordate, margins coarsely and doubly incised-serrate, apices usually acuminate.
2–9 mm, densely and closely puberulent.
1–5 mm, puberulent.
3.5–5 mm.
4–5 mm.
white, lobes sparsely villous.
white, lobes sparsely short-villous.
apices acute, abaxial faces puberulent to villous-puberulent.
apices acute, abaxial faces glabrous or sparsely and finely villous.
clustered.
clustered.
usually glabrous or sparsely puberulent (near apices), rarely hirtellous on angles.
glabrous.
= 34.
Ageratina aromatica
Ageratina altissima
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.)
Varieties 2 (2 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Phyllaries 3–5 mm, apices not cuspidate | var. altissima |
1. Phyllaries 4–7 mm, apices cuspidate to acuminate | var. roanensis |
Go Botany
LA Plants
MD Biodiversity
WildflowerSearch
iNaturalist
USDA Plants Database
IL Wildflowers
KS Wildflowers
MI Flora
MN Wildflowers
MO Plants
