Difference between revisions of "Ageratina occidentalis"
Phytologia 19: 224. 1970.
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|common_names=Western snakeroot | |common_names=Western snakeroot | ||
| − | |basionyms={{Treatment/ID/ | + | |special_status={{Treatment/ID/Special_status |
| + | |code=F | ||
| + | |label=Illustrated | ||
| + | }}{{Treatment/ID/Special_status | ||
| + | |code=E | ||
| + | |label=Endemic | ||
| + | }} | ||
| + | |basionyms={{Treatment/ID/Basionym | ||
|name=Eupatorium occidentale | |name=Eupatorium occidentale | ||
|authority=Hooker | |authority=Hooker | ||
| + | |rank=species | ||
| + | |publication_title=Fl. Bor.-Amer. | ||
| + | |publication_place=1: 305. 1833 | ||
}} | }} | ||
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name=Ageratina occidentalis | name=Ageratina occidentalis | ||
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|authority=(Hooker) R. M. King & H. Robinson | |authority=(Hooker) R. M. King & H. Robinson | ||
|rank=species | |rank=species | ||
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|publication title=Phytologia | |publication title=Phytologia | ||
|publication year=1970 | |publication year=1970 | ||
| − | |special status= | + | |special status=Illustrated;Endemic |
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V21_1402.xml |
|tribe=Asteraceae tribe Eupatorieae | |tribe=Asteraceae tribe Eupatorieae | ||
|genus=Ageratina | |genus=Ageratina | ||
Latest revision as of 20:10, 5 November 2020
Perennials or subshrubs, 15–70 cm (caudices woody, rhizomatous). Stems (green or purple) erect or ascending, puberulent. Leaves opposite proximally, alternate on distal 1/4–1/2 of stems; petioles 5–12 mm; blades triangular to ovate, 2.5–5 × 1.7–4 cm, bases truncate to cuneate, margins serrate, apices acute, abaxial faces gland-dotted. Heads clustered. Peduncles 2–5 mm, minutely puberulent. Involucres 3–3.5(–4) mm. Phyllaries: apices acute, abaxial faces viscid-puberulent and/or sessile-glandular. Corollas pink, bluish, or white tinged with purple, lobes glabrous or glabrate. Cypselae sessile-glandular. 2n = 34.
Phenology: Flowering (Jun–)Jul–Sep.
Habitat: Crevices, outcrops, rocky slopes, ridges, talus, gravelly and sandy stream bars, mixed hardwood-conifer woodlands, aspen, open and brushy vegetation
Elevation: (40–50)900–2800(–3200) m
Distribution
Calif., Idaho, Mont., Nev., Oreg., Utah, Wash.
Discussion
Ageratina occidentalis is the only species of the genus in the flora area with sessile-glandular cypselae; peduncles also may be sessile-glandular. Its identity also can be confirmed among flora area species by its relatively long (5–6 mm) corollas.
Selected References
None.