View source for Ageratum corymbosum

{{Treatment/ID
|accepted_name=Ageratum corymbosum
|accepted_authority=Zuccagni
|publications={{Treatment/Publication
|title=Cent. Observ. Bot., no.
|place=85. 1806
|year=1806
}}
|common_names=Flat-top whiteweed
|special_status={{Treatment/ID/Special_status
|code=F
|label=Illustrated
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Ageratum corymbosum var. jaliscense
|authority=B. L. Robinson
|rank=variety
}} {{Treatment/ID/Synonym
|name=Ageratum salicifolium
|authority=Hemsley
|rank=species
}} {{Treatment/ID/Synonym
|name=Ageratum strictum
|authority=
|rank=species
}}
|hierarchy=Asteraceae;Asteraceae tribe Eupatorieae;Ageratum;Ageratum corymbosum
|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>[[Ageratum]]</div><div class="higher-taxon"><small>species</small>[[Ageratum corymbosum]]</div></div>
|volume=Volume 21
|mention_page=page 481
|treatment_page=page 482
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Perennials </b>or subshrubs, 30–100 cm (fibrous-rooted). <b>Stems</b> erect to basally decumbent, puberulent to minutely strigoso-hispid. <b>Leaf</b> blades ovate to rhombic-lanceolate, 3–8 × 1–3.5 cm, margins toothed, abaxial faces usually puberulent, sometimes minutely strigoso-hispid, densely gland-dotted. <b>Peduncles</b> finely puberulent (not pilose), eglandular. <b>Involucres</b> 5–6 mm. <b>Phyllaries</b> narrowly lanceolate (0.4–0.7 mm wide, innermost often 1–1.5 mm longer than outer), finely puberulent, eglandular, tips green or purplish, filiform. <b>Corollas</b> usually blue to lavender, sometimes white. <b>Cypselae</b> glabrous; pappi usually crowns of connate scales with erose margins or tubular portions longer than divisions, rarely with 1 or more awnlike lobes. <b>2n</b> = 20, 30, 40.</span><!--

-->{{Treatment/Body
|phenology=Flowering Jul–Oct.
|habitat=Crevices, ledges, cliffs, other rocky sites in canyons, along streams, in desert grasslands, oak-agave, oak, oak-juniper, and pine-oak woodlands
|elevation=(900–)1200–1900 m
|distribution=Ariz.;N.Mex.;Mexico.
|discussion=<p>Habitat information came mostly from collections from Sonora and Chihuahua, Mexico. <i>Ageratum corymbosum</i> grows in all Mexican states except for the extreme southeast. It has been included in various summaries as occurring in Texas; as noted by D. S. Correll and M. C. Johnston (1970), those records apparently were based on a collection by Charles Wright from southwestern New Mexico.</p><!--
--><p>Varieties and forms of <i>Ageratum corymbosum</i> have been recognized (e.g., M. F. Johnson 1971; R. McVaugh 1984). McVaugh wryly noted that extremes of these intergrading infraspecific entities “can be recognized with a little imagination.” The form that reaches the United States (with ovate-lanceolate leaves) is var. jaliscense.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Ageratum corymbosum
|authority=Zuccagni
|rank=species
|parent rank=genus
|synonyms=Ageratum corymbosum var. jaliscense;Ageratum salicifolium;Ageratum strictum
|basionyms=
|family=Asteraceae
|phenology=Flowering Jul–Oct.
|habitat=Crevices, ledges, cliffs, other rocky sites in canyons, along streams, in desert grasslands, oak-agave, oak, oak-juniper, and pine-oak woodlands
|elevation=(900–)1200–1900 m
|distribution=Ariz.;N.Mex.;Mexico.
|reference=None
|publication title=Cent. Observ. Bot., no.
|publication year=1806
|special status=Illustrated
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V19-20-21/V21_1211.xml
|tribe=Asteraceae tribe Eupatorieae
|genus=Ageratum
|species=Ageratum corymbosum
}}<!--

-->[[Category:Treatment]][[Category:Ageratum]]