Ageratina adenophora

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

Phytologia 19: 211. 1970.

Common names: Crofton weed sticky snakeroot
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.
Revision as of 20:35, 16 December 2019 by FNA>Volume Importer

Subshrubs, 50–220 cm. Stems (usually purplish when young) erect, stipitate-glandular. Leaves opposite; petioles 10–25 mm; blades (abaxially purple) ovate-lanceolate 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 introduced in Europe, Pacific Islands (New Zealand).

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Ageratina adenophora"
Guy L. Nesom +
(Sprengel) R. M. King & H. Robinson +
Eupatorium adenophorum +
Crofton weed +  and sticky snakeroot +
Intoduced +, Calif. +, Mexico +, also introduced in Europe +  and Pacific Islands (New Zealand). +
400–900 m +
Stream margins, ditches, road embankments, hillsides +
Flowering Mar–Aug(–Sep). +
Compositae +
Ageratina adenophora +
Ageratina +
species +