Ageratina aromatica

(Linnaeus) Spach

Hist. Nat. Vég. 10: 286. 1841.

Common names: Small-leaved white snakeroot
Endemic
Basionyms: Eupatorium aromaticum Linnaeus Sp. Pl. 2: 839. 1753
Synonyms: Eupatorium latidens Small
Treatment appears in FNA Volume 21. Treatment on page 550. Mentioned on page 548, 551.

Perennials, 30–80 (–100) cm. Stems erect, villous-puberulent. 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. Heads clustered. Peduncles 2–9 mm, densely and closely puberulent. Involucres 3.5–5 mm. Phyllaries: apices acute, abaxial faces puberulent to villous-puberulent. Corollas white, lobes sparsely villous. Cypselae usually glabrous or sparsely puberulent (near apices), rarely hirtellous on angles. 2n = 34.


Phenology: Flowering late Aug–Oct(–Nov).
Habitat: Sandy soils, burned pinelands, turkey oak sand ridges, pine-oak and oak-hickory upland woods, old fields, roadsides, fencerows, moist sites
Elevation: 100–900 m

Distribution

V21-1395-distribution-map.gif

Ala., Conn., Del., Fla., Ky., La., Md., Mass., Miss., N.J., N.Y., N.C., Ohio, Pa., R.I., S.C., Tenn., Va., W.Va.

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.

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

... more about "Ageratina aromatica"
puberulent +  and villous-puberulent +
not tailed +, truncate +, rounded +  and obtuse +
scarious +
usually ovate +  and lanceolate +
usually terete +  and clavate +
indeterminate +  and determinate +
Guy L. Nesom +
(Linnaeus) Spach +
truncate +  and barely cuneate or subcordate +
enlarged +
Eupatorium aromaticum +
3(-5)-nerved +
7 cm70 mm <br />0.07 m <br /> (9 cm90 mm <br />0.09 m <br />) +
2 cm20 mm <br />0.02 m <br /> (7 cm70 mm <br />0.07 m <br />) +
dissected +, lobed +, toothed +  and entire +
deltate;nearly ovate or lanceolate +
1.5cm;4cm +
papillate +  and rugose +
(4-)5-angled;10-ribbed +
Small-leaved white snakeroot +
hirtellous +, puberulent +  and glabrous +
scabrellous +
fusiform +  and prismatic +
fertile +  and bisexual +
Ala. +, Conn. +, Del. +, Fla. +, Ky. +, La. +, Md. +, Mass. +, Miss. +, N.J. +, N.Y. +, N.C. +, Ohio +, Pa. +, R.I. +, S.C. +, Tenn. +, Va. +  and W.Va. +
100–900 m +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Sandy soils, burned pinelands, turkey oak sand ridges, pine-oak and oak-hickory upland woods, old fields, roadsides, fencerows, moist sites +
indeterminate +
each +  and sessile +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
campanulate +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
lanceolate +  and lance-linear +
subentire +, dentate +  and crenate +
2-carpellate +
persistent +
0.2 cm2 mm <br />0.002 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
Flowering late Aug–Oct(–Nov). +
2-nerved +  and 0-nerved +
8 +  and 30 +
subequal +  and unequal +
Hist. Nat. Vég. +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
appendaged +  and truncate +
hirsutulous +
papillate +
Eupatorium latidens +
Ageratina aromatica +
Ageratina +
species +
obconic +  and campanulate +
80 cm800 mm <br />0.8 m <br /> (100 cm1,000 mm <br />1 m <br />) +
30 cm300 mm <br />0.3 m <br /> (80 cm800 mm <br />0.8 m <br />) +
shrub +  and subshrub +