Flora of North America species comparison

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Ageratina herbacea

desert ageratina, fragrant snakeroot, white thoroughwort
Habit Perennials or subshrubs, (20–)30–60(–80) cm (woody crowns and woody rhizomes).
Stems

erect (brittle), minutely puberulent.
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.
Peduncles

4–15 mm, puberulent.
Involucres

4–5 mm.
Corollas

white, glabrous.
Phyllaries

apices acute, abaxial faces granular-puberulent.
Heads

clustered.
Cypselae

finely strigose-hispidulous.
2n

= 34.

Ageratina herbacea
Phenology Flowering (Jul–)Aug–Oct.
Habitat Pine, pine-oak, juniper, and pinyon-juniper woodlands, rocks along streams, slopes, ridges, washes
Elevation 1400–2700(–2900) m (4600–8900(–9500) ft)
Distribution
from FNA
AZ; CA; CO; NM; NV; TX; UT; Mexico (Baja California, Chihuahua, Coahuila, Sonora)
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[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.)
Source FNA vol. 21, p. 551.
Parent taxa 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
Synonyms Eupatorium ageratifolium var. herbaceum, Eupatorium herbaceum
Name authority (A. Gray) R. M. King & H. Robinson: Phytologia 19: 222. (1970)
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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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