Flora of North America species comparison

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Ageratina havanensis

Ageratina herbacea

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

desert ageratina, fragrant snakeroot, white thoroughwort
Habit Shrubs [trees], (30–)69–150(–200) cm. Perennials or subshrubs, (20–)30–60(–80) cm (woody crowns and woody rhizomes).
Stems

erect (brittle), puberulent to glabrous.

erect (brittle), minutely 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 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.
Peduncles

2–14 mm, minutely puberulent.

4–15 mm, puberulent.
Involucres

4–6 mm.

4–5 mm.
Corollas

white to slightly pinkish, glabrous.

white, glabrous.
Phyllaries

apices acute, abaxial faces glabrous or nearly so.

apices acute, abaxial faces granular-puberulent.
Heads

clustered.

clustered.
Cypselae

hispid.

finely strigose-hispidulous.
2n

= 34.

= 34.

Ageratina havanensis

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

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.)
Source FNA vol. 21, p. 552. FNA vol. 21, p. 551.
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. aromatica, A. havanensis, A. jucunda, A. lemmonii, A. luciae-brauniae, A. occidentalis, A. paupercula, A. rothrockii, A. shastensis, A. thyrsiflora, A. wrightii
Synonyms Eupatorium havanense Eupatorium ageratifolium var. herbaceum, Eupatorium herbaceum
Name authority (Kunth) R. M. King & H. Robinson: Phytologia 19: 222. (1970) (A. Gray) 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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