View source for Achnatherum occidentale subsp. californicum

{{Treatment/ID
|accepted_name=Achnatherum occidentale subsp. californicum
|accepted_authority=(Merr. & Burtt Davy) Barkworth
|publications=
|common_names=California needlegrass
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Stipa californica
|authority=
|rank=species
}}
|hierarchy=Poaceae;Poaceae subfam. Pooideae;Poaceae tribe Stipeae;Achnatherum;Achnatherum occidentale;Achnatherum occidentale subsp. californicum
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Poaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Poaceae subfam. Pooideae]]</div><div class="higher-taxon"><small>tribe</small>[[Poaceae tribe Stipeae]]</div><div class="higher-taxon"><small>genus</small>[[Achnatherum]]</div><div class="higher-taxon"><small>species</small>[[Achnatherum occidentale]]</div><div class="higher-taxon"><small>subspecies</small>[[Achnatherum occidentale subsp. californicum]]</div></div>
|volume=Volume 24
|mention_page=
|treatment_page=page 121
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Culms </b>30-100(180) cm tall, 0.5-2 mm thick, internodes glabrous or pubescent, sometimes densely pubescent; nodes 2-4, glabrous or pubescent. <b>Sheaths</b> glabrous, pubescent, or pilose; collars usually with tufts of hair at the sides; blades 0.8-2 mm wide, usually erect or ascending, adaxial surfaces pilose. <b>Panicles</b> 8-30 cm; branches appressed, longest branches to 7 cm. <b>Glumes</b> usually green; lower glumes 0.6-0.8 mm wide; lemmas with hairs to 0.8 mm at midlength, apical hairs to 1.8 mm, longer than the basal awn hairs; awns 18-55 mm, scabrous or pilose on the first 2 segments, with hairs to 0.5 mm and of mixed lengths, terminal segment usually scabrous, occasionally pilose at the base. <b>2n</b> = 36.</span><!--

-->{{Treatment/Body
|discussion=<p><i>Achnatherum occidentale </i>subsp.<i> californicum</i> grows from Washington through Idaho to southwestern Montana and south to California and <i>Nevada</i>, with disjunct records from south-central Wyoming and southwestern Utah. Its elevation range is 2000-4000 m.</p><!--
--><p>Johnson (1962) postulated that <i>Achnatherum occidentale </i>subsp.<i> californicum</i> is a hybrid derivative of <i>A. nelsonii</i> and <i>A. occidentale</i>; it intergrades with both. The scattering of longer hairs among shorter hairs on the basal awn segments, combined with the long apical lemma hairs, give florets of <i></i>subsp.<i> californicum</i> a more untidy appearance than those of the other two subspecies. It resembles <i>A. nevadense</i> in this respect, but differs from that species in the shape of the boundary between the glabrous and strigose portions of the callus, in usually being glabrous below the lower cauline nodes, and in having paleas that are shorter in relation to the lemmas. Plants with scabrous awns are often confused with <i>A. nelsonii </i>subsp.<i> nelsonii</i>; they differ in having sharper calluses, a more elongated extension of the glabrous callus area into the strigose portion of the callus, and, usually, longer awns.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Achnatherum occidentale subsp. californicum
|authority=(Merr. & Burtt Davy) Barkworth
|rank=subspecies
|parent rank=species
|synonyms=Stipa californica
|basionyms=
|family=Poaceae
|illustrator=Cindy Roché
|illustration copyright=Utah State University
|reference=None
|publication title=
|publication year=
|special status=Endemic
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V24/V24_173.xml
|subfamily=Poaceae subfam. Pooideae
|tribe=Poaceae tribe Stipeae
|genus=Achnatherum
|species=Achnatherum occidentale
|subspecies=Achnatherum occidentale subsp. californicum
}}<!--

-->[[Category:Treatment]][[Category:Achnatherum occidentale]]