View source for Atrichoseris

{{Treatment/ID
|accepted_name=Atrichoseris
|accepted_authority=A. Gray in A. Gray et al.
|publications={{Treatment/Publication
|title=in A. Gray et al., Syn. Fl. N. Amer.
|place=1(2): 410. 1884
|year=1884
}}
|common_names=Tobacco-weed;gravel-ghost;parachute plant
|basionyms={{Treatment/ID/Synonym
|name=Anathrix
|authority=A. Gray
}}
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Cichorieae;Atrichoseris
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Cichorieae]]</div><div class="higher-taxon"><small>genus</small>[[Atrichoseris]]</div></div>
|etymology=Greek a- , without, trichos, hair, and seris, chicory, alluding to lack of pappus
|volume=Volume 19
|mention_page=page 216
|treatment_page=page 309
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Annuals,</b> 20–180 cm (± scapiform); taprooted. <b>Stems</b> 1–3+, erect, branched distally, glabrous. <b>Leaves</b> mostly basal or subbasal (usually flat against soil), proximal cauline relatively few; sessile or petiolate (petioles winged); blades obovate, finely dentate (obtuse); distal cauline reduced to triangular scales. <b>Heads</b> in corymbiform arrays. <b>Peduncles</b> not inflated distally, sometimes bracteate. <b>Calyculi</b> of 4–6, triangular to lanceolate bractlets. <b>Involucres</b> cylindro-campanulate, 6–13+ mm diam. <b>Phyllaries</b> 10–15 in 1–2 series, lanceolate, ± equal, margins broadly hyaline, apices acuminate. <b>Receptacles</b> flat or slightly convex, smooth or minutely pitted, epaleate. <b>Florets</b> 30–60 (fragrant); corollas white, sometimes tipped with rose or purple (at least outer much longer than phyllaries). <b>Cypselae</b> whitish, subcylindric or weakly clavate, not beaked, bluntly 4–5-angled or -ribbed, ribs corky-thickened, faces glabrous or minutely puberulent; pappi 0. <b>x</b> = 9.</span><!--

-->{{Treatment/Body
|distribution=sw United States;nw Mexico.
|discussion=<p>Species 1.</p><!--
--><p>Molecular phylogenetic studies by J. Lee et al. (2003) indicated that Malacothrix is polyphyletic and that Atrichoseris is basal to the subclade of Malacothrix that does not contain the type species of that genus. Atrichoseris differs in base chromosome number (x = 9) from the species of Malacothrix with which it is most closely grouped (x = 7). Atrichoseris differs from Malacothrix in having apically truncate cypselae that are wholly epappose.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Atrichoseris
|author=David J. Keil
|authority=A. Gray in A. Gray et al.
|rank=genus
|parent rank=tribe
|synonyms=
|basionyms=Anathrix
|family=Asteraceae
|illustrator=John Myers
|distribution=sw United States;nw Mexico.
|reference=None
|publication title=in A. Gray et al., Syn. Fl. N. Amer.
|publication year=1884
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V19-20-21/V19_459.xml
|tribe=Asteraceae tribe Cichorieae
|genus=Atrichoseris
}}<!--

-->[[Category:Treatment]][[Category:Asteraceae tribe Cichorieae]]