View source for Descurainia obtusa

{{Treatment/ID
|accepted_name=Descurainia obtusa
|accepted_authority=(Greene) O. E. Schulz in H. G. A. Engler
|publications={{Treatment/Publication
|title=in H. G. A. Engler, Pflanzenr.
|place=86[IV,105]: 321. 1924
|year=1924
}}
|basionyms={{Treatment/ID/Basionym
|name=Sophia obtusa
|authority=Greene
|rank=species
|publication_title=Leafl. Bot. Observ. Crit.
|publication_place=1: 96. 1904
}}
|synonyms={{Treatment/ID/Synonym
|name=Sisymbrium obtusum
|authority=(Greene) A. Nelson & J. F. Macbride
|rank=species
}}
|hierarchy=Brassicaceae;Brassicaceae tribe Descurainieae;Descurainia;Descurainia obtusa
|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 obtusa]]</div></div>
|volume=Volume 7
|mention_page=page 519, 521
|treatment_page=page 525
}}<!--

--><span class="statement" id="st-undefined" data-properties="">Biennials; glandular or eglandular; finely pubescent, often canescent, trichomes dendritic, sometimes mixed with simple ones. <b>Stems</b> erect, unbranched basally or branched proximally and/or distally, 4–12(–15) dm. <b>Basal</b> leaves: petiole 0.5–3.7 cm; blade pinnate, oblanceolate to obovate or ovate in outline, 1–6 cm, lateral lobes (2–5 pairs), oblanceolate to linear or narrowly lanceolate, (7–25 × 2–10 mm), margins usually entire or serrate, rarely incised, (apex obtuse). <b>Cauline</b> leaves sessile or shortly petiolate; blade smaller distally, distal lobes often narrower, surfaces densely pubescent. <b>Racemes</b> considerably elongated in fruit. <b>Fruiting</b> pedicels ascending to divaricate, straight, 6–15 mm. <b>Flowers</b>: sepals spreading or sometimes ascending, greenish to yellowish, oblong, 1–2 mm, densely pubescent, (trichomes dendritic, sometimes mixed with glandular papillae); petals oblanceolate, 1–2 × 0.5–0.7 mm (equaling or shorter than sepals); median filaments 1.4–2 mm; anthers 0.2–0.3 mm. <b>Fruits</b> divaricate to suberect, linear, slightly torulose, 10–20(–23) × 0.7–1 mm, (acute at both ends); valves each with distinct midvein, (sparsely to densely pubescent); septum not veined; ovules 16–40 per ovary; style 0.1–0.2 mm, glabrous. <b>Seeds</b> uniseriate or biseriate, light brown, oblong, 0.7–1.1 × 0.5–0.6 mm. <b>2n</b> = 14.</span><!--

-->{{Treatment/Body
|phenology=Flowering May–Sep(-Oct).
|habitat=Gravelly grounds, sandy areas, disturbed sites, open forests, plateaus, abandoned mine areas, dry streams and washes
|elevation=1500-2600 m
|distribution=Ariz.;Nev.;N.Mex.;Mexico (Baja California).
|discussion=<p>As circumscribed here, <i>Descurainia obtusa</i> is a relatively uniform, diploid species. It probably was involved as a parent of <i>D. adenophora</i>, which is a hexaploid readily distinguished by characters discussed thereunder.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Descurainia obtusa
|authority=(Greene) O. E. Schulz in H. G. A. Engler
|rank=species
|parent rank=genus
|synonyms=Sisymbrium obtusum
|basionyms=Sophia obtusa
|family=Brassicaceae
|phenology=Flowering May–Sep(-Oct).
|habitat=Gravelly grounds, sandy areas, disturbed sites, open forests, plateaus, abandoned mine areas, dry streams and washes
|elevation=1500-2600 m
|distribution=Ariz.;Nev.;N.Mex.;Mexico (Baja California).
|reference=None
|publication title=in H. G. A. Engler, Pflanzenr.
|publication year=1924
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V7/V7_828.xml
|tribe=Brassicaceae tribe Descurainieae
|genus=Descurainia
|species=Descurainia obtusa
}}<!--

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