View source for Draba verna

{{Treatment/ID
|accepted_name=Draba verna
|accepted_authority=Linnaeus
|publications={{Treatment/Publication
|title=Sp. Pl.
|place=2: 642. 1753
|year=1753
}}
|common_names=Whitlow grass;whitlow wort
|special_status={{Treatment/ID/Special_status
|code=W
|label=Weedy
}}{{Treatment/ID/Special_status
|code=I
|label=Introduced
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Draba boerhaavii
|authority=(H. C. Hall) Raus
|rank=species
}} {{Treatment/ID/Synonym
|name=Draba praecox
|authority=Steven
|rank=species
}} {{Treatment/ID/Synonym
|name=Draba verna var. aestivalis
|authority=Lejeune
|rank=variety
}} {{Treatment/ID/Synonym
|name=Draba verna var. boerhaavii
|authority=H. C. Hall
|rank=variety
}} {{Treatment/ID/Synonym
|name=Erophila boerhaavii
|authority=(Steven) de Candolle
|rank=species
}} {{Treatment/ID/Synonym
|name=Erophila krockeri
|authority=(Linnaeus) L. Chevallier
|rank=species
}} {{Treatment/ID/Synonym
|name=Erophila praecox
|authority=
|rank=species
}} {{Treatment/ID/Synonym
|name=Erophila verna
|authority=
|rank=species
}} {{Treatment/ID/Synonym
|name=Erophila verna subsp. praecox
|authority=(Steven) Walters
|rank=subspecies
}}
|hierarchy=Brassicaceae;Brassicaceae tribe Arabideae;Draba;Draba verna
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Brassicaceae]]</div><div class="higher-taxon"><small>tribe</small>[[Brassicaceae tribe Arabideae]]</div><div class="higher-taxon"><small>genus</small>[[Draba]]</div><div class="higher-taxon"><small>species</small>[[Draba verna]]</div></div>
|volume=Volume 7
|mention_page=page 270, 271
|treatment_page=page 345
}}<!--

--><span class="statement" id="st-undefined" data-properties="">Annuals; scapose. <b>Stems</b> (few to many from base), unbranched, (0.2–)0.5–2(–3) dm, pubescent proximally, glabrous distally, trichomes simple and 2(–4)-rayed, 0.1–0.4 mm. <b>Basal</b> leaves rosulate; petiolate; blade obovate, spatulate, oblanceolate, lanceolate, oblong, or, rarely, linear, 0.2–1.8(–3) cm × (0.5–)1–5(–10) mm, margins entire or 1–5-toothed on each side, surfaces pubescent with simple or stalked, 2–4-rayed trichomes, 0.1–0.5 mm. <b>Cauline</b> leaves 0. <b>Racemes</b> 4–20(–30)-flowered, ebracteate, usually considerably elongated in fruit; rachis usually flexuous, glabrous. <b>Fruiting</b> pedicels divaricate to ascending, straight or slightly curved upward, (2–)5–20(–35) mm, glabrous. <b>Flowers</b>: sepals (green or purplish), oblong, 1–2.5 mm, glabrescent or pubescent, (trichomes simple or 2-rayed); petals white, deeply 2-fid, (1.5–)2–4.5(–6) × 1–2 mm; anthers ovate, 0.2–0.4 mm. <b>Fruits</b> obovate, oblanceolate, lanceolate, elliptic, oblong, or linear, plane, flattened, (2.5–)4–9(–12) × 1.5–2.5(–3.5) mm; valves glabrous; ovules (20–)32–70(–84) per ovary; style 0.02–0.2 mm. <b>Seeds</b> ovoid (slightly flattened), 0.3–0.6(–0.8) × 0.2–0.4 mm. <b>2n</b> = 14, 16, 20, 24, 28, 30, 32, 34, 36, 38, 40, 52, 54, 58, 60, 64.</span><!--

-->{{Treatment/Body
|phenology=Flowering Feb–May.
|habitat=Cedar glades, lawns, fields, pastures, waste places, grassy hillsides, disturbed sites, roadsides
|elevation=0-2500 m
|distribution=Alta.;B.C.;N.B.;Ont.;Que.;Ala.;Ark.;Calif.;Conn.;Del.;D.C.;Ga.;Idaho;Ill.;Ind.;Iowa;Ky.;Maine;Md.;Mass.;Mich.;Miss.;Mo.;Mont.;Nev.;N.H.;N.J.;N.Y.;N.C.;Ohio;Oreg.;Pa.;R.I.;S.C.;Tenn.;Utah;Vt.;Va.;Wash.;W.Va.;Wyo.;Europe;Asia;nw Africa;introduced also in Central America;South America;Australia.
|introduced=true
|discussion=<p><i>Draba verna</i> represents a highly variable and taxonomically difficult complex within which species, subspecies, varieties, and forms have been named (O. E. Schulz 1927); only those synonyms pertaining to North America are listed above. Most of the taxonomic difficulties are the results of disploidy, autogamy, and hybridization. The morphological extremes are connected by intermediate forms in every conceivable character. Furthermore, there appears to be no correlation between morphology, cytology, geography, and ecology to support the division of this complex into meaningful taxa. A complex cytological picture was presented by Ø. Winge (1940), including the highest count of 2n = 94, which has not been confirmed by subsequent botanists.</p><!--
--><p>Erophila vulgaris de Candolle is an illegitimate name for <i>Draba verna</i>.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Draba verna
|authority=Linnaeus
|rank=species
|parent rank=genus
|synonyms=Draba boerhaavii;Draba praecox;Draba verna var. aestivalis;Draba verna var. boerhaavii;Erophila boerhaavii;Erophila krockeri;Erophila praecox;Erophila verna;Erophila verna subsp. praecox
|basionyms=
|family=Brassicaceae
|phenology=Flowering Feb–May.
|habitat=Cedar glades, lawns, fields, pastures, waste places, grassy hillsides, disturbed sites, roadsides
|elevation=0-2500 m
|distribution=Alta.;B.C.;N.B.;Ont.;Que.;Ala.;Ark.;Calif.;Conn.;Del.;D.C.;Ga.;Idaho;Ill.;Ind.;Iowa;Ky.;Maine;Md.;Mass.;Mich.;Miss.;Mo.;Mont.;Nev.;N.H.;N.J.;N.Y.;N.C.;Ohio;Oreg.;Pa.;R.I.;S.C.;Tenn.;Utah;Vt.;Va.;Wash.;W.Va.;Wyo.;Europe;Asia;nw Africa;introduced also in Central America;South America;Australia.
|introduced=true
|reference=None
|publication title=Sp. Pl.
|publication year=1753
|special status=Weedy;Introduced
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V7/V7_483.xml
|tribe=Brassicaceae tribe Arabideae
|genus=Draba
|species=Draba verna
}}<!--

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[[Category:Treatment]]
[[Category:Draba]]
[[Category:Revised Since Print]]