Flora of North America species comparison

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Ageratina occidentalis

Ageratina havanensis

western boneset, western eupatorium, western snakeroot

Havana snakeroot, shrubby boneset, white mistflower, white shrub mistflower
Habit Perennials or subshrubs, 15–70 cm (caudices woody, rhizomatous). Shrubs [trees], (30–)69–150(–200) cm.
Stems

(green or purple) erect or ascending, puberulent.

erect (brittle), puberulent to glabrous.
Leaves

opposite proximally, alternate on distal 1/4–1/2 of stems;

petioles 5–12 mm;

blades triangular to ovate, 2.5–5 × 1.7–4 cm, bases truncate to cuneate, margins serrate, apices acute, abaxial faces gland-dotted.

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

2–5 mm, minutely puberulent.

2–14 mm, minutely puberulent.
Involucres

3–3.5(–4) mm.

4–6 mm.
Corollas

pink, bluish, or white tinged with purple, lobes glabrous or glabrate.

white to slightly pinkish, glabrous.
Phyllaries

apices acute, abaxial faces viscid-puberulent and/or sessile-glandular.

apices acute, abaxial faces glabrous or nearly so.
Heads

clustered.

clustered.
Cypselae

sessile-glandular.

hispid.
2n

= 34.

= 34.

Ageratina occidentalis

Ageratina havanensis
Phenology Flowering (Jun–)Jul–Sep. Flowering mainly (Sep–)Oct–Nov(–Dec), also Apr–Jul.
Habitat Crevices, outcrops, rocky slopes, ridges, talus, gravelly and sandy stream bars, mixed hardwood-conifer woodlands, aspen, open and brushy vegetation Bluffs, limestone outcrops and slopes, ledges along streams, often in oak-juniper woodlands
Elevation (40–50)900–2800(–3200) m ((100–200)3000–9200(–10500) ft) 100–900 m (300–3000 ft)
Distribution
from FNA
CA; ID; MT; NV; OR; UT; WA
[WildflowerSearch map]
[BONAP county map]
from FNA
TX; Mexico; West Indies (Cuba)
[WildflowerSearch map]
[BONAP county map]
Discussion

Ageratina occidentalis is the only species of the genus in the flora area with sessile-glandular cypselae; peduncles also may be sessile-glandular. Its identity also can be confirmed among flora area species by its relatively long (5–6 mm) corollas.

(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. 552. FNA vol. 21, p. 552.
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. 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 occidentale Eupatorium havanense
Name authority (Hooker) R. M. King & H. Robinson: Phytologia 19: 224. (1970) (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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