Ageratina herbacea (A. Gray) King & H.E. Robins.
Family: Asteraceae
fragrant snakeroot,  more...
[Ageratina betulaefolia (Greene) R.M.King & H.Rob.,  more]
Ageratina herbacea image
Max Licher  
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. Flowering (Jul-)Aug-Oct. Pine, pine-oak, juniper, and pinyon-juniper woodlands, rocks along streams, slopes, ridges, washes; 1400-2700(-2900) m; Ariz., Calif., Colo., Nev., N.Mex., Tex., Utah; Mexico (Baja California, Chihuahua, Coahuila, Sonora). 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.

FNA 2006, Kearney and Peebles 1969, McDougall 1973
Duration: Perennial Nativity: Native Lifeform: Subshrub General: Perennial herbs or subshrubs to 80 cm tall, sometimes from a woody crown or woody rhizomes; stems erect, puberulent, often brittle. Leaves: Opposite and petiolate, the petioles 1-2.5 cm; blades triangular to broadly ovate, to 8 cm long, truncate to subcordate at the base, acute or acuminate at the tip, the margins toothed, the upper surface sparsely hispidulous to glabrate; color is often yellow-green but can be grayish. Flowers: Flower heads discoid, in dense or open clusters, on peduncles to 1.5 cm; involucre (the ring of bracts surrounding each flower head) campanulate, 3-4 mm high, the bracts in 2 series, subequal, lanceolate with acuminate tips, puberulent; flowers are all discs (radial, bisexual, with a 5-lobed corolla), 10-20 per head, with white corollas and protruding stamens. Fruits: Achenes to 2 mm long, finely strigose-hispidulous. Ecology: Found in rocky areas along streams, slopes, ridges, and washes, in open pine forests and juniper woodlands, from 5,000-9,000 ft (1524-2743 m); flowers August-October. Distribution: CA and NV east to CO, NM, and TX; south to n MEX. Notes: Look for this species under Eupatorium herbaceum in the older texts. The keys to this species are the opposite, petiolate leaves, often yellow-green in color; the glabrous corolla lobes; the involucres 3-4 mm high with 2 rows of subequal phyllaries (bracts); and the woody root crowns. This species looks like a Brickellia except for its toothed and deeply veined leaves. Ethnobotany: A cold infusion or lotion was used for headache, cold, or fever. Etymology: Ageratina is a dimunitive of Ageratum, which is from Greek ageratons for not growing old, while herbacea means herbaceous. Synonyms: Eupatorium herbaceum Editor: LCrumbacher 2011, FSCoburn 2015, AHazelton 2015
Ageratina herbacea image
Max Licher  
Ageratina herbacea image
Max Licher  
Ageratina herbacea image
Max Licher  
Ageratina herbacea image
Max Licher  
Ageratina herbacea image
Max Licher  
Ageratina herbacea image
Max Licher  
Ageratina herbacea image
Max Licher  
Ageratina herbacea image
Anthony Mendoza  
Ageratina herbacea image
Max Licher  
Ageratina herbacea image
Liz Makings  
Ageratina herbacea image
Liz Makings  
Ageratina herbacea image
Anthony Mendoza  
Ageratina herbacea image
Ageratina herbacea image
Sue Carnahan  
Ageratina herbacea image
Sue Carnahan  
Ageratina herbacea image
Patrick Alexander  
Ageratina herbacea image
Patrick Alexander  
Ageratina herbacea image
Kirstin Phillips  
Ageratina herbacea image
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Ageratina herbacea image
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