View source for Alyssum alyssoides

{{Treatment/ID
|accepted_name=Alyssum alyssoides
|accepted_authority=(Linnaeus) Linnaeus
|publications={{Treatment/Publication
|title=Syst. Nat. ed.
|place=10, 2: 1130. 1759
|year=1759
}}
|special_status={{Treatment/ID/Special_status
|code=W
|label=Weedy
}}{{Treatment/ID/Special_status
|code=I
|label=Introduced
}}
|basionyms={{Treatment/ID/Basionym
|name=Clypeola alyssoides
|authority=Linnaeus
|rank=species
|publication_title=Sp. Pl.
|publication_place=2: 652. 1753
}}
|synonyms={{Treatment/ID/Synonym
|name=Alyssum calycinum
|authority=Linnaeus
|rank=species
}}
|hierarchy=Brassicaceae;Brassicaceae tribe Alysseae;Alyssum;Alyssum alyssoides
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Brassicaceae]]</div><div class="higher-taxon"><small>tribe</small>[[Brassicaceae tribe Alysseae]]</div><div class="higher-taxon"><small>genus</small>[[Alyssum]]</div><div class="higher-taxon"><small>species</small>[[Alyssum alyssoides]]</div></div>
|volume=Volume 7
|mention_page=
|treatment_page=page 248
}}<!--

--><span class="statement" id="st-undefined" data-properties="">Annuals; canescent throughout, trichomes appressed, 6–10-rayed, mixed with simple and forked on pedicels and sepals. <b>Stems</b> simple or few to several from base, erect, ascending, or decumbent, (unbranched or branched distally), 0.5–3.5(–5) dm. <b>Cauline</b> leaves subsessile or (proximal) shortly petiolate; blade usually narrowly oblanceolate to linear, sometimes spatulate or obovate, 3–4(–4.5) cm × (0.5–)1–3.5(–5) mm, base attenuate or cuneate, apex obtuse or acute. <b>Fruiting</b> pedicels divaricate or ascending, straight, slender, 2–5(–6) mm, trichomes stellate, with fewer, simple and forked ones. <b>Flowers</b>: sepals (persistent) oblong, (1.5–)2–3 × 0.7–1.1 mm, pubescent as pedicels; petals (often persistent) white or pale yellow, usually linear to linear-oblanceolate, rarely obovate, 2–3(–4) × 0.3–0.7(–1) mm, apex emarginate, glabrous or sparsely stellate-pubescent abaxially; filaments (slender) not appendaged, toothed, or winged, 1–1.5 mm; anthers ovate, 0.15–0.2 mm. <b>Fruits</b> orbicular, (2–)3–4(–5) mm diam., apex emarginate or truncate; valves uniformly inflated at middle, strongly flattened at margins, sparsely stellate-pubescent; ovules 2 per ovary; style (slender), 0.3–0.6(–1) mm, basally stellate-pubescent or glabrous. <b>Seeds</b> oblong to ovoid, compressed, 1.1–2 × 0.7–1.1 mm, margins narrow, ca. 0.1 mm wide. <b>2n</b> = 32.</span><!--

-->{{Treatment/Body
|phenology=Flowering May–Jul.
|habitat=Roadsides, railways, waste grounds, disturbed sites, grassy areas, fields, sagebrush flats, limestone ledges or bluffs
|elevation=0-1800 m
|distribution=Alta.;B.C.;Man.;Nfld. and Labr. (Nfld.);Ont.;Que.;Sask.;Alaska;Ariz.;Calif.;Colo.;Conn.;Idaho;Ill.;Ind.;Iowa;Kans.;Maine;Md.;Mass.;Mich.;Mont.;N.J.;N.Mex.;N.Y.;Ohio;Oreg.;Pa.;R.I.;S.Dak.;Utah;Vt.;Va.;Wash.;W.Va.;Wis.;Wyo.;Europe;sw Asia;n Africa.
|introduced=true
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Alyssum alyssoides
|authority=(Linnaeus) Linnaeus
|rank=species
|parent rank=genus
|synonyms=Alyssum calycinum
|basionyms=Clypeola alyssoides
|family=Brassicaceae
|phenology=Flowering May–Jul.
|habitat=Roadsides, railways, waste grounds, disturbed sites, grassy areas, fields, sagebrush flats, limestone ledges or bluffs
|elevation=0-1800 m
|distribution=Alta.;B.C.;Man.;Nfld. and Labr. (Nfld.);Ont.;Que.;Sask.;Alaska;Ariz.;Calif.;Colo.;Conn.;Idaho;Ill.;Ind.;Iowa;Kans.;Maine;Md.;Mass.;Mich.;Mont.;N.J.;N.Mex.;N.Y.;Ohio;Oreg.;Pa.;R.I.;S.Dak.;Utah;Vt.;Va.;Wash.;W.Va.;Wis.;Wyo.;Europe;sw Asia;n Africa.
|introduced=true
|reference=None
|publication title=Syst. Nat. ed.
|publication year=1759
|special status=Weedy;Introduced
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V7/V7_319.xml
|tribe=Brassicaceae tribe Alysseae
|genus=Alyssum
|species=Alyssum alyssoides
}}<!--

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