Ageratina adenophora

(Sprengel) R. M. King & H. Robinson

Phytologia 19: 211. 1970.

Common names: Crofton weed sticky snakeroot
Introduced
Basionym: Eupatorium adenophorum Sprengel Syst. Veg. 3: 420. 1826,; 4(qto.): 122, plate 346. 1820, not Michaux 1803
Treatment appears in FNA Volume 21. Treatment on page 553. Mentioned on page 547, 548.
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Subshrubs, 50–220 cm. Stems (usually purplish when young) erect, stipitate-glandular. Leaves opposite; petioles 10–25 mm; blades (abaxially purple) ovatelanceolate or ovate-deltate to lanceolate-ovate, (1.5–) 2.5–5.5 (–8) × 1.5–4 (–6) cm, bases cuneate to obtuse or nearly truncate, margins serrate, apices acute to acuminate, abaxial faces stipitate to sessile-glandular. Heads clustered. Peduncles 5–12 mm, densely stipitate-glandular and sometimes also sparsely viscid-puberulent. Involucres 3.5–4 mm. Phyllaries: apices acute, abaxial faces stipitate-glandular. Corollas white, pink-tinged, lobes sparsely hispidulous. Cypselae glabrous. 2n = 51.


Phenology: Flowering Mar–Aug(–Sep).
Habitat: Stream margins, ditches, road embankments, hillsides
Elevation: 400–900 m

Distribution

V21-1404-distribution-map.gif

Intoduced, Calif., Mexico, also in Europe, Pacific Islands (New Zealand)

Discussion

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

... more about "Ageratina adenophora"
stipitate +  and sessile-glandular +
stipitate-glandular +
not tailed +, truncate +, rounded +  and obtuse +
acute;acute;acuminate +
scarious +
usually ovate +  and lanceolate +
usually terete +  and clavate +
indeterminate +  and determinate +
Guy L. Nesom +
(Sprengel) R. M. King & H. Robinson +
cuneate +  and obtuse +
enlarged +
Eupatorium adenophorum +
3(-5)-nerved +
5.5 cm55 mm <br />0.055 m <br /> (8 cm80 mm <br />0.08 m <br />) +
4 cm40 mm <br />0.04 m <br /> (6 cm60 mm <br />0.06 m <br />) +
2.5 cm25 mm <br />0.025 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
dissected +, lobed +, toothed +  and entire +
ovate-deltate;lanceolate-ovate +
1.5 cm15 mm <br />0.015 m <br /> (4 cm40 mm <br />0.04 m <br />) +
papillate +  and rugose +
(4-)5-angled;10-ribbed +
Crofton weed +  and sticky snakeroot +
pink-tinged +  and white +
scabrellous +
fusiform +  and prismatic +
fertile +  and bisexual +
Intoduced +, Calif. +, Mexico +, also in Europe +  and Pacific Islands (New Zealand) +
400–900 m +
puberulent +, pilose +, hispidulous +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Stream margins, ditches, road embankments, hillsides +
indeterminate +
each +  and sessile +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
campanulate +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
hispidulous +
lanceolate +  and lance-linear +
2-carpellate +
persistent +
viscid-puberulent +  and stipitate-glandular +
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
Flowering Mar–Aug(–Sep). +
2-nerved +  and 0-nerved +
8 +  and 30 +
subequal +  and unequal +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
Introduced +
stipitate-glandular +
appendaged +  and truncate +
hirsutulous +
papillate +
Compositae +
Ageratina adenophora +
Ageratina +
species +
obconic +  and campanulate +