All Floras      Advanced Search
FNA Vol. 21 Page 548, 549, 551 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 21 | Asteraceae | Ageratina

7. Ageratina herbacea (A. Gray) R. M. King & H. Robinson, Phytologia. 19: 222. 1970.

Fragrant snakeroot

Eupatorium ageratifolium de Candolle var. herbaceum A. Gray, Smithsonian Contr. Knowl. 5(6): 74. 1853; E. herbaceum (A. Gray) Greene

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.


Related Objects  
  • Distribution Map
  • Map

     |  eFlora Home |  People Search  |  Help  |  ActKey  |  Hu Cards  |  Glossary  |