Ageratina herbacea

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

Phytologia 19: 222. 1970.

Common names: Fragrant snakeroot
Basionym: Eupatorium ageratifolium var. herbaceum A. Gray Smithsonian Contr. Knowl. 5(6): 74. 1853
Synonyms: Eupatorium herbaceum (A. Gray) Greene
Treatment appears in FNA Volume 21. Treatment on page 551. Mentioned on page 548.

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), Mexico (Chihuahua), Mexico (Coahuila), Mexico (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.

"fine" is not a number.

... more about "Ageratina herbacea"
granular-puberulent +, sparsely hispidulous +  and glabrate +
not tailed +, truncate +, rounded +  and obtuse +
scarious +
usually ovate +  and lanceolate +
usually terete +  and clavate +
indeterminate +  and determinate +
Guy L. Nesom +
(A. Gray) R. M. King & H. Robinson +
truncate +  and shallowly cordate +
enlarged +
Eupatorium ageratifolium var. herbaceum +
3(-5)-nerved +
5 cm50 mm <br />0.05 m <br /> (7 cm70 mm <br />0.07 m <br />) +
3.5 cm35 mm <br />0.035 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
dissected +, lobed +, toothed +  and entire +
triangular;lanceolate-ovate or ovate +
1.5cm;3.5cm +
papillate +  and rugose +
(4-)5-angled;10-ribbed +
Fragrant snakeroot +
strigose-hispidulous +
scabrellous +
fusiform +  and prismatic +
fertile +  and bisexual +
Ariz. +, Calif. +, Colo. +, Nev. +, N.Mex. +, Tex. +, Utah +, Mexico (Baja California) +, Mexico (Chihuahua) +, Mexico (Coahuila) +  and Mexico (Sonora) +
1400–2700(–2900) m +
puberulent +, pilose +, hispidulous +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Pine, pine-oak, juniper, and pinyon-juniper woodlands, rocks along streams, slopes, ridges, washes +
indeterminate +
each +  and sessile +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
campanulate +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
lanceolate +  and lance-linear +
dentate +  and serrate-dentate +
2-carpellate +
persistent +
0.4 cm4 mm <br />0.004 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
Flowering (Jul–)Aug–Oct. +
2-nerved +  and 0-nerved +
8 +  and 30 +
subequal +  and unequal +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
appendaged +  and truncate +
hirsutulous +
papillate +
Eupatorium herbaceum +
Ageratina herbacea +
Ageratina +
species +
obconic +  and campanulate +
60 cm600 mm <br />0.6 m <br /> (80 cm800 mm <br />0.8 m <br />) +
30 cm300 mm <br />0.3 m <br /> (60 cm600 mm <br />0.6 m <br />) +