Flora of North America species comparison

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Ageratina herbacea

Ageratina havanensis

desert ageratina, fragrant snakeroot, white thoroughwort

Havana snakeroot, shrubby boneset, white mistflower, white shrub mistflower
Habit Perennials or subshrubs, (20–)30–60(–80) cm (woody crowns and woody rhizomes). Shrubs [trees], (30–)69–150(–200) cm.
Stems

erect (brittle), minutely puberulent.

erect (brittle), puberulent to glabrous.
Leaves

opposite;

petioles 10–25 mm;

blades triangular to lanceolate-ovate or ovate, 2–5(–7) × 1.5–3.5(–4.5) cm, bases truncate to shallowly cordate, margins dentate to serrate-dentate, abaxial faces sparsely hispidulous to glabrate, eglandular.

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

4–15 mm, puberulent.

2–14 mm, minutely puberulent.
Involucres

4–5 mm.

4–6 mm.
Corollas

white, glabrous.

white to slightly pinkish, glabrous.
Phyllaries

apices acute, abaxial faces granular-puberulent.

apices acute, abaxial faces glabrous or nearly so.
Heads

clustered.

clustered.
Cypselae

finely strigose-hispidulous.

hispid.
2n

= 34.

= 34.

Ageratina herbacea

Ageratina havanensis
Phenology Flowering (Jul–)Aug–Oct. Flowering mainly (Sep–)Oct–Nov(–Dec), also Apr–Jul.
Habitat Pine, pine-oak, juniper, and pinyon-juniper woodlands, rocks along streams, slopes, ridges, washes Bluffs, limestone outcrops and slopes, ledges along streams, often in oak-juniper woodlands
Elevation 1400–2700(–2900) m (4600–8900(–9500) ft) 100–900 m (300–3000 ft)
Distribution
from FNA
AZ; CA; CO; NM; NV; TX; UT; Mexico (Baja California, Chihuahua, Coahuila, Sonora)
[WildflowerSearch map]
[BONAP county map]
from FNA
TX; Mexico; West Indies (Cuba)
[WildflowerSearch map]
[BONAP county map]
Discussion

Ageratina herbacea is recognized by the distinctive color of its usually yellow-green, sometimes grayish, leaves, granular-puberulent involucres (with minute, thickened, eglandular hairs), and woody rhizomes.

(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. 551. 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. 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 ageratifolium var. herbaceum, Eupatorium herbaceum Eupatorium havanense
Name authority (A. Gray) R. M. King & H. Robinson: Phytologia 19: 222. (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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