Ageratina herbacea

(A. Gray) R. M. King & H. Robinson

Phytologia 19: 222. 1970.

Common names: Fragrant snakeroot
Basionym: Eupatorium ageratifolium var. herbaceum A. Gray
Synonyms: Eupatorium herbaceum (A. Gray) Greene
Treatment appears in FNA Volume 21. Treatment on page 551. Mentioned on page 548.
Revision as of 00:55, 27 July 2019 by FNA>Volume Importer
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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. Heads clustered. Peduncles 4–15 mm, puberulent. Involucres 4–5 mm. Phyllaries: apices acute, abaxial faces granular-puberulent. Corollas white, glabrous. Cypselae finely strigose-hispidulous. 2n = 34.


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

Distribution

V21-1398-distribution-map.gif

Ariz., Calif., Colo., Nev., N.Mex., Tex., Utah, Mexico (Baja California, Chihuahua, Coahuila, Sonora).

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.

Selected References

None.

Lower Taxa

None.
... more about "Ageratina herbacea"
Guy L. Nesom +
(A. Gray) R. M. King & H. Robinson +
Eupatorium ageratifolium var. herbaceum +
Fragrant snakeroot +
Ariz. +, Calif. +, Colo. +, Nev. +, N.Mex. +, Tex. +, Utah +, Mexico (Baja California +, Chihuahua +, Coahuila +  and Sonora). +
1400–2700(–2900) m +
Pine, pine-oak, juniper, and pinyon-juniper woodlands, rocks along streams, slopes, ridges, washes +
Flowering (Jul–)Aug–Oct. +
Eupatorium herbaceum +
Ageratina herbacea +
Ageratina +
species +