View source for Rytidosperma biannulare

{{Treatment/ID
|accepted_name=Rytidosperma biannulare
|accepted_authority=(Zotov) Connor & Edgar
|publications=
|basionyms=
|synonyms=
|hierarchy=Poaceae;Poaceae subfam. Danthonioideae;Poaceae tribe Danthonieae;Rytidosperma;Rytidosperma biannulare
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Poaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Poaceae subfam. Danthonioideae]]</div><div class="higher-taxon"><small>tribe</small>[[Poaceae tribe Danthonieae]]</div><div class="higher-taxon"><small>genus</small>[[Rytidosperma]]</div><div class="higher-taxon"><small>species</small>[[Rytidosperma biannulare]]</div></div>
|volume=Volume 25
|mention_page=
|treatment_page=page 311
}}<!--

--><span class="statement" id="st-d0_s0" data-properties="whole_organism growth form;whole_organism growth form"><b>Plants </b>cespitose.</span> <span class="statement" id="st-d0_s1" data-properties="culm some measurement;culm orientation;culm architecture;culm position"><b>Culms </b>30-85 cm, erect, branching intravaginal.</span> <span class="statement" id="st-d0_s2" data-properties="leaf position;inflorescence position relational;inflorescence position relational"><b>Leaves </b>mostly basal, exceeded by the culms, flag leaf-blades usually reaching or exceeding the inflorescences;</span> <span class="statement" id="st-d0_s3" data-properties="sheath pubescence;sheath coloration;apical tuft presence;hair some measurement">sheaths mostly glabrous, often purplish distally, with apical tufts of hairs sometimes present, hairs to 5 mm;</span> <span class="statement" id="st-d0_s4" data-properties="ligule atypical some measurement;ligule some measurement">ligules 0.3-0.5 (1) mm;</span> <span class="statement" id="st-d0_s5" data-properties="blade length;blade width;blade shape or vernation;surface position;surface pubescence or relief;blade life cycle;blade pubescence;blade pubescence">blades 30-40 cm long, to 5 mm wide, usually involute, margins, apices, and sometimes adaxial surfaces scabrous, young blades sparsely pilose, becoming glabrous at maturity.</span> <span class="statement" id="st-d0_s6" data-properties="inflorescence some measurement;inflorescence size or width;panicle density"><b>Inflorescences </b>10-20 cm, narrow, dense panicles;</span> <span class="statement" id="st-d0_s7" data-properties="rachis pubescence or relief;pedicel pubescence or relief">rachises and pedicels scabrous.</span> <span class="statement" id="st-d0_s8" data-properties="spikelet atypical some measurement;spikelet some measurement;spikelet length or size;floret quantity"><b>Spikelets </b>(7) 10-15 mm, longer than the rachis internodes, with 6-7 florets;</span> <span class="statement" id="st-d0_s9" data-properties="rachilla segment some measurement">rachilla segments 0.3-0.5 mm.</span> <span class="statement" id="st-d0_s10" data-properties="glume atypical some measurement;glume some measurement;glume size;glume shape;glume shape"><b>Glumes </b>7.6-11 (13.2) mm, subequal, lanceolate, subacute;</span> <span class="statement" id="st-d0_s11" data-properties="lower glume architecture">lower glumes 5-7 (9) -veined;</span> <span class="statement" id="st-d0_s12" data-properties="upper glume architecture">upper glumes 5-veined;</span> <span class="statement" id="st-d0_s13" data-properties="callus some measurement">calluses 0.5-0.7 mm, with marginal tufts of hairs reaching the lower lemma hairs;</span> <span class="statement" id="st-d0_s14" data-properties="lemma body atypical some measurement;lemma body some measurement;lemma body architecture;lower and upper row density;hair prominence;margin architecture or pubescence or shape;portion pubescence;hair height or length or size;hair arrangement">lemma bodies 1.8-2.4 (2.8) mm, 7-9-veined, lower and upper rows of hairs dense, hairs of lower rows usually not or only just reaching the upper rows, sometimes ill-defined, hairs of upper rows clearly exceeding the base of the awn but exceeded by the lemma lobes, margins ciliate, other portions of the lemma with short scattered hairs, sometimes glabrous below the upper row of hairs;</span> <span class="statement" id="st-d0_s15" data-properties="lobe atypical some measurement;lobe some measurement;lobe shape">lobes 3.5-5 (8.5) mm, aristate;</span> <span class="statement" id="st-d0_s16" data-properties="awn atypical some measurement;awn some measurement">awns 6-10 (12.5) mm;</span> <span class="statement" id="st-d0_s17" data-properties="palea some measurement;palea architecture or shape;intercostal region pubescence;margin pubescence;vein architecture or pubescence or shape">paleas 2.5-4.6 mm, exceeding the lemma sinuses, emarginate, intercostal region sparsely hairy, margins usually long-hairy, veins ciliate;</span> <span class="statement" id="st-d0_s18" data-properties="anther some measurement">anthers 0.8-1.6 mm.</span> <span class="statement" id="st-d0_s19" data-properties="caryopsis length;caryopsis width"><b>Caryopses </b>1.2-1.9 mm long, 0.6-0.8 mm wide;</span> <span class="statement" id="st-d0_s20" data-properties="embryo some measurement">embryos 0.5-0.8 mm;</span> <span class="statement" id="st-d0_s21" data-properties="hilum some measurement">hila 0.3-0.6 mm. <b>2n</b> = unknown.</span><!--

-->{{Treatment/Body
|distribution=Calif.;Oreg.
|discussion=<p>Rytidosperma biannulare is endemic to New Zealand. As early as 1905, it was grown experimentally under the name Danthonia semiannularis (Labill.) R. Br. in several states. Although frequently mentioned in literature, only a few specimens document its persistence in Oregon and California.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Rytidosperma biannulare
|authority=(Zotov) Connor & Edgar
|rank=species
|parent rank=genus
|synonyms=
|basionyms=
|family=Poaceae
|illustrator=Linda A. Vorobik;Hana Pazdírková
|illustration copyright=Utah State University
|distribution=Calif.;Oreg.
|reference=None
|publication title=
|publication year=
|special status=
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V25/V25_976.xml
|subfamily=Poaceae subfam. Danthonioideae
|tribe=Poaceae tribe Danthonieae
|genus=Rytidosperma
|species=Rytidosperma biannulare
|anther some measurement=0.8mm;1.6mm
|apical tuft presence=absent
|awn atypical some measurement=12.5
|awn some measurement=6mm;10mm
|blade length=30cm;40cm
|blade life cycle=young
|blade pubescence=glabrous;pilose
|blade shape or vernation=involute
|blade width=0mm;5mm
|callus some measurement=0.5mm;0.7mm
|caryopsis length=1.2mm;1.9mm
|caryopsis width=0.6mm;0.8mm
|culm architecture=branching
|culm orientation=erect
|culm position=intravaginal
|culm some measurement=30cm;85cm
|embryo some measurement=0.5mm;0.8mm
|floret quantity=6;7
|glume atypical some measurement=13.2
|glume shape=subacute;lanceolate
|glume size=subequal
|glume some measurement=7.6mm;11mm
|hair arrangement=scattered
|hair height or length or size=short
|hair prominence=ill-defined
|hair some measurement=0mm;5mm
|hilum some measurement=0.3mm;0.6mm
|inflorescence position relational=exceeding;reaching
|inflorescence size or width=narrow
|inflorescence some measurement=10cm;20cm
|intercostal region pubescence=hairy
|leaf position=basal
|lemma body architecture=7-9-veined
|lemma body atypical some measurement=2.8
|lemma body some measurement=1.8mm;2.4mm
|ligule atypical some measurement=1
|ligule some measurement=0.3mm;0.5mm
|lobe atypical some measurement=8.5
|lobe shape=aristate
|lobe some measurement=3.5mm;5mm
|lower and upper row density=dense
|lower glume architecture=5-7(9)-veined
|margin architecture or pubescence or shape=ciliate
|margin pubescence=long-hairy
|palea architecture or shape=emarginate
|palea some measurement=2.5mm;4.6mm
|panicle density=dense
|pedicel pubescence or relief=scabrous
|portion pubescence=glabrous
|rachilla segment some measurement=0.3mm;0.5mm
|rachis pubescence or relief=scabrous
|sheath coloration=purplish
|sheath pubescence=glabrous
|spikelet atypical some measurement=7
|spikelet length or size=longer
|spikelet some measurement=10mm;15mm
|surface position=adaxial
|surface pubescence or relief=scabrous
|upper glume architecture=5-veined
|vein architecture or pubescence or shape=ciliate
|whole_organism growth form=plant;cespitose
}}<!--

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