View source for Achnatherum ×bloomeri

{{Treatment/ID
|accepted_name=Achnatherum ×bloomeri
|accepted_authority=(Bol.) Barkworth
|publications=
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=×stiporyzopsis bloomeri
|authority=
|rank=species
}} {{Treatment/ID/Synonym
|name=Oryzopsis ×bloomeri
|authority=
|rank=species
}} {{Treatment/ID/Synonym
|name=Stipa bloomeri
|authority=
|rank=species
}}
|hierarchy=Poaceae;Poaceae subfam. Pooideae;Poaceae tribe Stipeae;Achnatherum;Achnatherum ×bloomeri
|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 ×bloomeri]]</div></div>
|volume=Volume 24
|mention_page=
|treatment_page=page 142
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|distribution=Colo.;N.Mex.;Utah;Calif.;Oreg.;Wyo.;Mont.;Wash.;Ariz.;Idaho;Nev.
|discussion=<p><i>Achnatherum ×bloomeri</i> and other hybrids involving <i>A. hymenoides</i></p><!--
--><p>Numerous natural hybrids exist between <i>Achnatherum hymenoides</i> and other members of the Stipeae. Johnson (1945, 1960, 1962, 1963, 1972) described several of these; all are sterile. Using the treatment adopted here, Johnson's hybrids have as the second parent <i>A. occidentale</i> (all subspecies), <i>A. thurberianum</i>, <i>A. scribneri</i>, <i>A. robustum</i>, <i>Jarava speciosa</i>, and <i>Nassella viridula</i>. Evidence from herbarium specimens suggests that <i>A. hymenoides</i> also forms sterile hybrids with other species of <i>Achnatherum</i>. The name <i>Achnatherum ×bloomeri</i> applies only to hybrids between <i>A. hymenoides</i> and <i>A. occidentale </i>subsp.<i> occidentale</i>, but plants keying here may include any of the other interspecific hybrids. They all differ from <i>A. hymenoides</i> in having more elongated florets and awns 10-20 mm long, and from their other parent, in most instances, in having longer lemma hairs and more saccate glumes. Identification of the second parent is best made in the field by noting which other species of Stipeae are present, bearing in mind that species that are not in anthesis at the same time in one year might have sufficient overlap for hybridization in other years.</p><!--
--><p>Of the two intergeneric hybrids mentioned above, that with <i>Nassella viridula</i> is treated as ×Achnella caduca (see p. 169). It differs from <i>Achnatherum hymenoides</i> in its longer glumes and florets, and from other <i>A. hymenoides</i> hybrids in having a readily deciduous awn. No binomial has been proposed for the hybrid with <i>Jarava speciosa</i>. There is one fertile intergeneric hybrid involving <i>A. hymenoides</i>, <i>A. contractum</i>. It is included in <i>Achnatherum</i> and described below because it resembles other members of <i>Achnatherum</i> more than it does <i>Piptatherum</i>, the genus of the other parent.</p><!--
--><p>Sterile hybrids have anthers that do not dehisce, and contain few, poorly formed pollen grains. They also fail to form good caryopses, but this is also true of some non-hybrid plants. In the case of non-hybrid plants, failure to form good caryopses can result from failure to capture pollen or from incompatibility between the pollen grain and the pistillate plant. It is not known which, if either, of these explanations accounts for the large number of empty caryopses found in <i>Achnatherum hymenoides</i>.</p>
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-->{{#Taxon:
name=Achnatherum ×bloomeri
|authority=(Bol.) Barkworth
|rank=species
|parent rank=genus
|synonyms=×stiporyzopsis bloomeri;Oryzopsis ×bloomeri;Stipa bloomeri
|basionyms=
|family=Poaceae
|illustrator=Cindy Roché
|illustration copyright=Utah State University
|distribution=Colo.;N.Mex.;Utah;Calif.;Oreg.;Wyo.;Mont.;Wash.;Ariz.;Idaho;Nev.
|reference=None
|publication title=
|publication year=
|special status=
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V24/V24_190.xml
|subfamily=Poaceae subfam. Pooideae
|tribe=Poaceae tribe Stipeae
|genus=Achnatherum
|species=Achnatherum ×bloomeri
}}<!--

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