View source for ×leydeum ← ×leydeum You do not have permission to edit this page, for the following reason: The action you have requested is limited to users in the group: Users. You can view and copy the source of this page. {{Treatment/ID |accepted_name=×leydeum |accepted_authority=Barkworth |publications= |basionyms= |synonyms= |hierarchy=Poaceae;Poaceae subfam. Pooideae;Poaceae tribe Triticeae;×leydeum |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 Triticeae]]</div><div class="higher-taxon"><small>genus</small>[[×leydeum]]</div></div> |volume=Volume 24 |mention_page= |treatment_page=page 369 }}<!-- --><span class="statement" id="st-d0_s0" data-properties=""><b>Plants </b>perennial;</span> <span class="statement" id="st-d0_s1" data-properties="whole_organism duration;whole_organism architecture;whole_organism growth form">rhizomatous, sometimes shortly so.</span> <span class="statement" id="st-d0_s2" data-properties="culm height;culm thickness"><b>Culms </b>to 140 cm tall, 1-3 mm thick.</span> <span class="statement" id="st-d0_s3" data-properties="spike length;spike width;spike orientation;spike architecture or arrangement;spikelet quantity"><b>Spikes </b>10-15 cm long, 5-12 mm wide excluding the awns, erect, sometimes lax, nodes with 2-3 spikelets;</span> <span class="statement" id="st-d0_s4" data-properties="">internodes 3-5 mm;</span> <span class="statement" id="st-d0_s5" data-properties="internode some measurement">disarticulation in the rachises, sometimes delayed.</span> <span class="statement" id="st-d0_s6" data-properties="spikelet fixation or orientation;floret quantity"><b>Spikelets </b>appressed, with 1-3 florets.</span> <span class="statement" id="st-d0_s7" data-properties="glume variability;glume size;glume length;glume width;glume shape;midlength position;base shape"><b>Glumes </b>equal or unequal, 10-25 mm long, 0.2-1.5 mm wide, tapering from below midlength or subulate from the base;</span> <span class="statement" id="st-d0_s8" data-properties="lemma pubescence;lemma pubescence;lemma architecture or shape;awn some measurement">lemmas glabrous or hairy, awned, awns 1-10 mm;</span> <span class="statement" id="st-d0_s9" data-properties="anther length;anther thickness">anthers 1.8-3 mm long, 0.1-0.3 mm thick.</span> <span class="statement" id="st-d0_s10" data-properties="caryopse development"><b>Caryopses </b>not developed.</span><!-- -->{{Treatment/Body |distribution=Oreg. |discussion=<p>×Leydeum consists of hybrids between Hordeum and Leymus. The number of named ×Leydeum hybrids is substantially lower than that for hybrids between Hordeum and Elymus.</p><!-- --><p>This probably reflects the lower likelihood of such hybrids being formed, because Leymus does not incorporate the H genome of Hordeum, whereas Elymus does. It is also possible that such hybrids are less likely to be recognized, because inland species of Leymus, like Hordeum, have narrow glumes. Of the three species recognized, two involve the coastal species L. mollis, which has flat glumes; these hybrids have intermediate glumes and rachises that tend to disarticulate. ×Leydeum piperi, the only hybrid involving one of the inland species of Leymus, differs from Leymus in its disarticulating rachises, and from Hordeum in having 2 spikelets per node and 2-3 florets in the larger spikelets.</p> |tables= |references={{Treatment/Reference |id=bowden1967c |text=Bowden, W.M. 1967. Taxonomy of intergeneric hybrids of the tribe Triticeae from North America. Canad. J. Bot. 45:™11-724 }}{{Treatment/Reference |id=covas1949a |text=Covas, G. 1949. Taxonomic observations on the North American species of Hordeum. Madrono 9:233-264 }}{{Treatment/Reference |id=hodgson1965a |text=Hodgson, H.J. and W.W. Mitchell. 1965. A new Elymordeum hybrid from Alaska. Canad. J. Bot 43:1355-1358 }}{{Treatment/Reference |id=hulten1968b |text=Hulten, E. 1968. Comments on the flora of Alaska and Yukon. Ark. Bot., n.s., 7:1-147. }} }}<!-- --><!-- -->{{#Taxon: name=×leydeum |author=Mary E. Barkworth; |authority=Barkworth |rank=genus |parent rank=tribe |synonyms= |basionyms= |family=Poaceae |distribution=Oreg. |reference=bowden1967c;covas1949a;hodgson1965a;hulten1968b |publication title= |publication year= |special status= |source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V24/V24_532.xml |subfamily=Poaceae subfam. Pooideae |tribe=Poaceae tribe Triticeae |genus=×leydeum |anther length=1.8mm;3mm |anther thickness=0.1mm;0.3mm |awn some measurement=1mm;10mm |base shape=subulate |caryopse development=not developed |culm height=0cm;140cm |culm thickness=1mm;3mm |floret quantity=1;3 |glume length=10mm;25mm |glume shape=tapering |glume size=unequal |glume variability=equal |glume width=0.2mm;1.5mm |internode some measurement=3mm;5mm |lemma architecture or shape=awned |lemma pubescence=hairy;glabrous |midlength position=midlength |spike architecture or arrangement=lax |spike length=10cm;15cm |spike orientation=erect |spike width=5mm;12mm |spikelet fixation or orientation=appressed |spikelet quantity=2;3 |whole_organism architecture=rhizomatous |whole_organism duration=perennial |whole_organism growth form=plant }}<!-- -->[[Category:Treatment]][[Category:Poaceae tribe Triticeae]] Templates used on this page: Template:Poaceae (view source) Template:Treatment/AuthorLink (view source) Template:Treatment/Body (view source) Template:Treatment/Body/Maps (view source) Template:Treatment/ID (view source) Template:Treatment/Reference (view source) Return to ×leydeum.