Flora of North America species comparison

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Ageratina aromatica

Ageratina havanensis

lesser snakeroot, small-leaf white snakeroot

Havana snakeroot, shrubby boneset, white mistflower, white shrub mistflower
Habit Perennials, 30–80(–100) cm. Shrubs [trees], (30–)69–150(–200) cm.
Stems

erect, villous-puberulent.

erect (brittle), puberulent to 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.

persistent, opposite;

petioles 3–10(–15) mm;

blades deltate to broadly ovate or somewhat hastate, (2–)3–5(–8) × 2–5 cm, bases truncate to cuneate, margins dentate, apices acute, faces glabrous or nearly so, eglandular.
Peduncles

2–9 mm, densely and closely puberulent.

2–14 mm, minutely puberulent.
Involucres

3.5–5 mm.

4–6 mm.
Corollas

white, lobes sparsely villous.

white to slightly pinkish, glabrous.
Phyllaries

apices acute, abaxial faces puberulent to villous-puberulent.

apices acute, abaxial faces glabrous or nearly so.
Heads

clustered.

clustered.
Cypselae

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

hispid.
2n

= 34.

= 34.

Ageratina aromatica

Ageratina havanensis
Phenology Flowering late Aug–Oct(–Nov). Flowering mainly (Sep–)Oct–Nov(–Dec), also Apr–Jul.
Habitat Sandy soils, burned pinelands, turkey oak sand ridges, pine-oak and oak-hickory upland woods, old fields, roadsides, fencerows, moist sites Bluffs, limestone outcrops and slopes, ledges along streams, often in oak-juniper woodlands
Elevation 100–900 m (300–3000 ft) 100–900 m (300–3000 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
TX; Mexico; West Indies (Cuba)
[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.)

Ageratina havanensis apparently is the only species of the genus in the flora area with evergreen-persistent leaves.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 21, p. 550. FNA vol. 21, p. 552.
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. herbacea, A. jucunda, A. lemmonii, A. luciae-brauniae, A. occidentalis, A. paupercula, A. rothrockii, A. shastensis, A. thyrsiflora, A. wrightii
Synonyms Eupatorium aromaticum, Eupatorium latidens Eupatorium havanense
Name authority (Linnaeus) Spach: Hist. Nat. Vég. 10: 286. (1841) (Kunth) R. M. King & H. Robinson: Phytologia 19: 222. (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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