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.
Revision as of 21:59, 29 July 2020 by imported>Volume Importer
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

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 +
1.5 cm15 mm <br />0.015 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
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 +
puberulent +
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 />) +
60 cm600 mm <br />0.6 m <br /> (80 cm800 mm <br />0.8 m <br />) +