Flora of North America species comparison

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Ageratina havanensis

Ageratina aromatica

Havana snakeroot, shrubby boneset, white mistflower, white shrub mistflower

lesser snakeroot, small-leaf white snakeroot
Habit Shrubs [trees], (30–)69–150(–200) cm. Perennials, 30–80(–100) cm.
Stems

erect (brittle), puberulent to glabrous.

erect, villous-puberulent.
Leaves

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.

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

2–14 mm, minutely puberulent.

2–9 mm, densely and closely puberulent.
Involucres

4–6 mm.

3.5–5 mm.
Corollas

white to slightly pinkish, glabrous.

white, lobes sparsely villous.
Phyllaries

apices acute, abaxial faces glabrous or nearly so.

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

clustered.

clustered.
Cypselae

hispid.

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

= 34.

= 34.

Ageratina havanensis

Ageratina aromatica
Phenology Flowering mainly (Sep–)Oct–Nov(–Dec), also Apr–Jul. Flowering late Aug–Oct(–Nov).
Habitat Bluffs, limestone outcrops and slopes, ledges along streams, often in oak-juniper woodlands 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 (300–3000 ft) 100–900 m (300–3000 ft)
Distribution
from FNA
TX; Mexico; West Indies (Cuba)
[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

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.)

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. 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. havanensis, A. herbacea, A. jucunda, A. lemmonii, A. luciae-brauniae, A. occidentalis, A. paupercula, A. rothrockii, A. shastensis, A. thyrsiflora, A. wrightii
Synonyms Eupatorium havanense Eupatorium aromaticum, Eupatorium latidens
Name authority (Kunth) R. M. King & H. Robinson: Phytologia 19: 222. (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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