View source for Amaranthus blitoides

{{Treatment/ID
|accepted_name=Amaranthus blitoides
|accepted_authority=S. Watson
|publications={{Treatment/Publication
|title=Proc. Amer. Acad. Arts
|place=12: 273. 1877
|year=1877
}}
|common_names=Prostrate pigweed;prostrate amaranth;matweed;matweed amaranth
|special_status={{Treatment/ID/Special_status
|code=W
|label=Weedy
}}{{Treatment/ID/Special_status
|code=F
|label=Illustrated
}}
|basionyms=
|synonyms=
|hierarchy=Amaranthaceae;Amaranthus;Amaranthus subg. Albersia;Amaranthus blitoides
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Amaranthaceae]]</div><div class="higher-taxon"><small>genus</small>[[Amaranthus]]</div><div class="higher-taxon"><small>subgenus</small>[[Amaranthus subg. Albersia]]</div><div class="higher-taxon"><small>species</small>[[Amaranthus blitoides]]</div></div>
|volume=Volume 4
|mention_page=page 414, 428
|treatment_page=page 434
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>annual, glabrous. <b>Stems</b> prostrate or ascending (very rarely suberect), much-branched (usually from base), (0.1–)0.2–0.6(–1) m. <b>Leaves</b>: petiole ± 1/2 as long as blade; blade obovate, elliptic, or spatulate, 1–2(–4) × 0.5–1(–1.5) cm, base cuneate and tapering, margins usually entire, plane, rarely slightly undulate, apex obtuse, rounded, mucronulate. <b>Inflorescences</b> axillary glomerules, green. <b>Bracts</b> of pistillate flowers narrow, thin, 1.5–5 mm, ± equaling or slightly exceeding tepals. <b>Pistillate</b> flowers: tepals (3–)4–5, narrowly ovate to broadly linear, unequal or subequal, 1.5–3 mm, thin, apex acute or acuminate; style branches spreading; stigmas 3. <b>Staminate</b> flowers intermixed with pistillate; tepals 3(–4); stamens 3. <b>Utricles</b> broadly ovoid, 1.7–2.5 mm, equaling tepals, mostly smooth (slightly verrucose or rugose in dry plants), dehiscence regularly circumscissile. <b>Seeds</b> black, lenticular to broadly plumply lenticular, 1.3–1.6 mm diam., rather dull.</span><!--

-->{{Treatment/Body
|phenology=Flowering summer–fall.
|habitat=Disturbed habitats: roadsides, riverbanks, railroads, fields, waste places, sandy flats
|elevation=0-2200 m
|distribution=Alta.;B.C.;Man.;Ont.;Que.;Sask.;Ala.;Alaska;Ariz.;Ark.;Calif.;Colo.;Conn.;Del.;D.C.;Fla.;Ga.;Idaho;Ill.;Ind.;Iowa;Kans.;Ky.;La.;Maine;Md.;Mass.;Mich.;Minn.;Mo.;Mont.;Nebr.;Nev.;N.H.;N.J.;N.Mex.;N.Y.;N.Dak.;Ohio;Okla.;Oreg.;Pa.;R.I.;S.C.;S.Dak.;Tenn.;Tex.;Utah;Vt.;Va.;Wash.;W.Va.;Wis.;Wyo.;introduced and often completely naturalized in South America;Eurasia;and other regions.
|discussion=<p>The name <i>Amaranthus graecizans</i> often has been misapplied to both <i>A. blitoides</i> and <i>A. albus</i> in older North American floras and manuals.</p><!--
--><p><i>Amaranthus blitoides</i> was probably originally native to central and partly eastern United States, but now it is widely and successfully naturalized almost everywhere in temperate North America and in many subtropical to warm-temperate regions. It has not been reported from Mississippi or North Carolina but since it is found in all other conterminous United States it can be expected to occur in these two as well.</p><!--
--><p>Varieties have been described within <i>Amaranthus blitoides</i>; most of them are of no taxonomic significance, being mostly ecologic forms or local morphologic variants. Among the infraspecific taxa, the most constant is <i></i>var.<i> reverchonii</i> Uline & W. L. Bray, with narrower, more elongated leaves.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Amaranthus blitoides
|authority=S. Watson
|rank=species
|parent rank=subgenus
|synonyms=
|basionyms=
|family=Amaranthaceae
|phenology=Flowering summer–fall.
|habitat=Disturbed habitats: roadsides, riverbanks, railroads, fields, waste places, sandy flats
|elevation=0-2200 m
|distribution=Alta.;B.C.;Man.;Ont.;Que.;Sask.;Ala.;Alaska;Ariz.;Ark.;Calif.;Colo.;Conn.;Del.;D.C.;Fla.;Ga.;Idaho;Ill.;Ind.;Iowa;Kans.;Ky.;La.;Maine;Md.;Mass.;Mich.;Minn.;Mo.;Mont.;Nebr.;Nev.;N.H.;N.J.;N.Mex.;N.Y.;N.Dak.;Ohio;Okla.;Oreg.;Pa.;R.I.;S.C.;S.Dak.;Tenn.;Tex.;Utah;Vt.;Va.;Wash.;W.Va.;Wis.;Wyo.;introduced and often completely naturalized in South America;Eurasia;and other regions.
|reference=None
|publication title=Proc. Amer. Acad. Arts
|publication year=1877
|special status=Weedy;Illustrated
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V4/V4_851.xml
|genus=Amaranthus
|subgenus=Amaranthus subg. Albersia
|species=Amaranthus blitoides
}}<!--

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