View source for Descurainia incisa

{{Treatment/ID
|accepted_name=Descurainia incisa
|accepted_authority=(Engelmann ex A. Gray) Britton
|publications={{Treatment/Publication
|title=Mem. Torrey Bot. Club
|place=5: 173. 1894
|year=1894
}}
|basionyms={{Treatment/ID/Basionym
|name=Sisymbrium incisum
|authority=Engelmann ex A. Gray
|rank=species
|publication_title=Mem. Amer. Acad. Arts, n. s.
|publication_place=4: 8. 1849
}}
|synonyms=
|hierarchy=Brassicaceae;Brassicaceae tribe Descurainieae;Descurainia;Descurainia incisa
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Brassicaceae]]</div><div class="higher-taxon"><small>tribe</small>[[Brassicaceae tribe Descurainieae]]</div><div class="higher-taxon"><small>genus</small>[[Descurainia]]</div><div class="higher-taxon"><small>species</small>[[Descurainia incisa]]</div></div>
|volume=Volume 7
|mention_page=page 519, 520, 521
|treatment_page=page 523
}}<!--

--><span class="statement" id="st-undefined" data-properties="">Annuals; glandular or eglandular; densely to sparsely pubescent, glabrous or pubescent distally, sometimes canescent, trichomes dendritic. <b>Stems</b> erect, usually unbranched basally, branched distally or sometimes throughout, (1.3–)2–8.2(–10.7) dm. <b>Basal</b> leaves: petiole 0.5–4.7 cm; blade pinnate, obovate to oblanceolate in outline, 1.5–10.3 cm, lateral lobes (2–9 pairs), ovate or oblong to lanceolate or linear, margins usually dentate to incised or entire, rarely pinnatifid or crenate. <b>Cauline</b> leaves sessile or shortly petiolate; blade smaller distally, distal lobes oblong, lanceolate, linear, (margins dentate to denticulate or entire), surfaces pubescent or glabrous. <b>Racemes</b> considerably elongated in fruit, (glandular or eglandular). <b>Fruiting</b> pedicels ascending to divaricate or horizontal, straight, (3–)5–25(–30) mm. <b>Flowers</b>: sepals erect to ascending, yellowish, oblong to ovate, 1.6–2.4 mm, glabrous or pubescent; petals narrowly oblanceolate, 1.7–2.8 × 0.5–0.9 mm; median filaments 1.6–2.4 mm; anthers 0.3–0.4 mm. <b>Fruits</b> erect to ascending, linear, slightly torulose, 8–20 × 0.9–1.3 mm, (straight or slightly to strongly curved inward); valves each not veined or with distinct midvein; septum not veined; ovules 14–26 per ovary; style 0.1–0.3 mm, glabrous. <b>Seeds</b> uniseriate, reddish brown, oblong, 0.9–1.3 × 0.5–0.6 mm.</span><!--

-->{{Treatment/Body
|distribution=Alta.;B.C.;Yukon;Ariz.;Calif.;Colo.;Idaho;Mont.;N.Mex.;Nev.;Oreg.;Utah;Wash.;Wyo.;n Mexico.
|discussion=<p>Subspecies 2 (2 in the flora).</p><!--
--><p>As delimited by various authors and as represented in all major herbaria consulted, <i>Descurainia incisa</i> is highly variable in almost all features. The variation is most likely the result of hybridization with all species of the genus that have overlapping ranges. Forms with few-seeded, short fruits tapering at both ends most likely represent hybrids with <i>D. californica</i>; those with sub-biseriate seeds most likely resulted from crossing with <i>D. pinnata</i>, and the origin of forms with somewhat subappressed fruits almost certainly involved <i>D. incana</i>. The recognition of glandular versus eglandular forms as distinct varieties or subspecies is completely artificial. The lectotype (Fendler 29, GH) and isolectotype (MO) are eglandular; a syntype (Fendler 31, MO) is densely glandular.</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Fruiting pedicels ascending to divaricate, (3-) 5-10(-12) mm; lateral lobes of basal and proximal cauline blades (3-)5-9 pairs, margins usually coarsely dentate to incised, rarely crenate or pinnatifid; lobes of distal cauline blades oblong to lanceolate, margins dentate to denticulate; fruits straight or curved inward.
|[[Descurainia incisa subsp. incisa|Descurainia incisa subsp. incisa]]
|-id=key-0-1
|1
|Fruiting pedicels horizontal to divaricate, (10-) 13-25(-30) mm; lateral lobes of basal and proximal cauline blades 2 or 3 (or 4) pairs, margins usually entire; lobes of distal cauline blades linear, margins entire; fruits curved inward.
|[[Descurainia incisa subsp. paysonii|Descurainia incisa subsp. paysonii]]
|}
</div></div><!--

-->{{#Taxon:
name=Descurainia incisa
|authority=(Engelmann ex A. Gray) Britton
|rank=species
|parent rank=genus
|synonyms=
|basionyms=Sisymbrium incisum
|family=Brassicaceae
|distribution=Alta.;B.C.;Yukon;Ariz.;Calif.;Colo.;Idaho;Mont.;N.Mex.;Nev.;Oreg.;Utah;Wash.;Wyo.;n Mexico.
|reference=None
|publication title=Mem. Torrey Bot. Club
|publication year=1894
|special status=
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V7/V7_822.xml
|tribe=Brassicaceae tribe Descurainieae
|genus=Descurainia
|species=Descurainia incisa
}}<!--

-->[[Category:Treatment]][[Category:Descurainia]]