View source for Ageratina occidentalis

{{Treatment/ID
|accepted_name=Ageratina occidentalis
|accepted_authority=(Hooker) R. M. King & H. Robinson
|publications={{Treatment/Publication
|title=Phytologia
|place=19: 224. 1970
|year=1970
}}
|common_names=Western snakeroot
|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
|authority=Hooker
|rank=species
|publication_title=Fl. Bor.-Amer.
|publication_place=1: 305. 1833
}}
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Eupatorieae;Ageratina;Ageratina occidentalis
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Eupatorieae]]</div><div class="higher-taxon"><small>genus</small>[[Ageratina]]</div><div class="higher-taxon"><small>species</small>[[Ageratina occidentalis]]</div></div>
|volume=Volume 21
|mention_page=page 547, 548
|treatment_page=page 552
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Perennials </b>or subshrubs, 15–70 cm (caudices woody, rhizomatous). <b>Stems</b> (green or purple) erect or ascending, puberulent. <b>Leaves</b> 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. <b>Heads</b> clustered. <b>Peduncles</b> 2–5 mm, minutely puberulent. <b>Involucres</b> 3–3.5(–4) mm. <b>Phyllaries</b>: apices acute, abaxial faces viscid-puberulent and/or sessile-glandular. <b>Corollas</b> pink, bluish, or white tinged with purple, lobes glabrous or glabrate. <b>Cypselae</b> sessile-glandular. <b>2n</b> = 34.</span><!--

-->{{Treatment/Body
|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=<p><i>Ageratina occidentalis</i> 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.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Ageratina occidentalis
|authority=(Hooker) R. M. King & H. Robinson
|rank=species
|parent rank=genus
|synonyms=
|basionyms=Eupatorium occidentale
|family=Asteraceae
|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.
|reference=None
|publication title=Phytologia
|publication year=1970
|special status=Illustrated;Endemic
|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
|genus=Ageratina
|species=Ageratina occidentalis
}}<!--

-->[[Category:Treatment]][[Category:Ageratina]]