View source for Gamochaeta pensylvanica

{{Treatment/ID
|accepted_name=Gamochaeta pensylvanica
|accepted_authority=(Willdenow) Cabrera
|publications={{Treatment/Publication
|title=Bol. Soc. Argent. Bot.
|place=9: 375. 1961
|year=1961
}}
|common_names=Pennsylvania cudweed
|special_status={{Treatment/ID/Special_status
|code=F
|label=Illustrated
}}
|basionyms={{Treatment/ID/Basionym
|name=Gnaphalium pensylvanicum
|authority=Willdenow
|rank=species
|publication_title=Enum. Pl.,
|publication_place=867. 1809,
}}
|synonyms={{Treatment/ID/Synonym
|name=Gnaphalium peregrinum
|authority=Fernald
|rank=species
}}
|hierarchy=Asteraceae;Asteraceae tribe Gnaphalieae;Gamochaeta;Gamochaeta pensylvanica
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Gnaphalieae]]</div><div class="higher-taxon"><small>genus</small>[[Gamochaeta]]</div><div class="higher-taxon"><small>species</small>[[Gamochaeta pensylvanica]]</div></div>
|volume=Volume 19
|mention_page=page 433
|treatment_page=page 437
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Annuals,</b> 10–50 cm; taprooted. <b>Stems</b> erect to decumbent or procumbent, loosely arachnose-tomentose. <b>Leaves</b> basal and cauline, proximal usually present at flowering, blades spatulate to oblanceolate-obovate, 2–7 cm × 4–16 mm (becoming spatulate to oblanceolate bracts among proximal heads, surpassing glomerules, bases narrowed to petiolar regions, margins sinuate, apices often apiculate), faces concolor or weakly bicolor, loosely tomentose. <b>Heads</b> in glomerules in continuous or interrupted, spiciform arrays 1–12 cm × 10–15 mm (pressed). <b>Involucres</b> cupulate-campanulate, 3–3.5 mm, bases sparsely arachnose. <b>Phyllaries</b> in 3–4 series, outer ovate-triangular, lengths 1/2–2/3 inner, apices attenuate-apiculate, inner oblong, laminae often purple-tinged (at stereome), apices (transparent, sometimes golden) acute to obtuse. <b>Florets</b>: bisexual 3–4; all (or at least bisexual) corollas usually purplish distally. <b>Cypselae</b> (tan) 0.4–0.5 mm. <b>2n</b> = 28.</span><!--

-->{{Treatment/Body
|phenology=Flowering Mar–Jun(–Aug).
|habitat=Disturbed sites, exposed, moist soils, commonly partially shaded
|elevation=0–500 m
|distribution=Ala.;Calif.;Fla.;Ga.;La.;Md.;Mass.;Miss.;N.C.;Okla.;Pa.;S.C.;Tex.;Va.;Mexico;Central America;South America;Europe;Asia;Africa;Australia.
|discussion=<p><i>Gamochaeta pensylvanica</i> is recognized by its obovate-spatulate, loosely tomentose and concolor or weakly bicolor basal and proximal cauline leaves, and similarly shaped spreading bracts among the heads. Occasional plants appear intermediate between <i>G. pensylvanica</i> and <i>G. antillana</i>. The latter differs in its more erect stems, linear to oblanceolate basal and proximal cauline leaves, and more nearly continuous arrays of heads with linear to narrowly oblanceolate bracts.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Gamochaeta pensylvanica
|authority=(Willdenow) Cabrera
|rank=species
|parent rank=genus
|synonyms=Gnaphalium peregrinum
|basionyms=Gnaphalium pensylvanicum
|family=Asteraceae
|phenology=Flowering Mar–Jun(–Aug).
|habitat=Disturbed sites, exposed, moist soils, commonly partially shaded
|elevation=0–500 m
|distribution=Ala.;Calif.;Fla.;Ga.;La.;Md.;Mass.;Miss.;N.C.;Okla.;Pa.;S.C.;Tex.;Va.;Mexico;Central America;South America;Europe;Asia;Africa;Australia.
|reference=None
|publication title=Bol. Soc. Argent. Bot.
|publication year=1961
|special status=Illustrated
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V19_722.xml
|tribe=Asteraceae tribe Gnaphalieae
|genus=Gamochaeta
|species=Gamochaeta pensylvanica
}}<!--

-->[[Category:Treatment]][[Category:Gamochaeta]]