View source for Glyceria grandis

{{Treatment/ID
|accepted_name=Glyceria grandis
|accepted_authority=S. Watson
|publications=
|common_names=American glyceria;American mannagrass
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Glyceria maxima subsp. grandis
|authority=
|rank=subspecies
}} {{Treatment/ID/Synonym
|name=Glyceria grandis f. pallescens
|authority=
|rank=forma
}}
|hierarchy=Poaceae;Poaceae subfam. Pooideae;Poaceae tribe Meliceae;Glyceria;Glyceria sect. Hydropoa;Glyceria grandis
|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 Meliceae]]</div><div class="higher-taxon"><small>genus</small>[[Glyceria]]</div><div class="higher-taxon"><small>section</small>[[Glyceria sect. Hydropoa]]</div><div class="higher-taxon"><small>species</small>[[Glyceria grandis]]</div></div>
|volume=Volume 24
|mention_page=
|treatment_page=page 71
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>perennial. <b>Culms</b> 50-150 (200) cm tall, 8-12 mm thick, erect or decumbent and rooting at the base. <b>Sheaths</b> smooth or scabridulous, keeled; ligules 1-5 (7) mm, truncate to rounded, ligules of the lower leaves stiff at the base, ligules of the upper leaves flexible throughout; blades 25-43 cm long, 4.5-15 mm wide. <b>Panicles</b> 16-42 cm long, 12-20 cm wide, open; branches (7)10-18 cm, lax, widely divergent to drooping, with 35-80+ spikelets; pedicels 1-15 mm. <b>Spikelets</b> 3.2-10 mm long, 2-3 mm wide, somewhat laterally compressed, oval to elliptic in side view, with 4-10 florets. <b>Glumes</b> mostly hyaline, usually the midvein of 1 or both glumes extending to the apices, apices acute; lower glumes 1-2.3 mm; upper glumes 1.5-2.7 mm; rachilla internodes 0.5-0.8 mm; lemmas 1.8-3 mm, prominently (5)7-veined, veins often scabridulous, intercostal regions smooth, apices rounded to truncate, sometimes erose, almost flat at maturity; paleas from shorter than to slightly longer than the lemmas, lengths more than 3 times widths, keels not winged, ciliolate, tips not strongly incurved, truncate to notched between the keels; anthers 3, 0.5-1.2 mm. <b>Caryopses</b> 1-1.5 mm. <b>2n</b> =20.</span><!--

-->{{Treatment/Body
|distribution=Conn.;N.J.;N.Y.;Wash.;Del.;Wis.;W.Va.;Wyo.;N.H.;N.Mex.;N.C.;Tenn.;Pa.;Ariz.;Ill.;Ind.;Md.;Mich.;Minn.;Miss.;Mont.;N.Dak.;Nebr.;R.I.;S.Dak.;Utah;Vt.;Calif.;Nev.;Va.;Iowa;Oreg.;Colo.;Alaska;Alta.;B.C.;Man.;N.B.;Nfld. and Labr. (Labr.);N.S.;N.W.T.;Ont.;P.E.I.;Que.;Sask.;Yukon;Idaho;Maine;Mass.;Ohio
|discussion=<p><i>Glyceria grandis</i> grows on banks and in the water of streams, ditches, ponds, and wet meadows, from Alaska to Newfoundland and south in the mountains to California, Arizona, and New Mexico in the western United States, and to Virginia and Tennessee in the eastern United States. It is similar to <i>G. maxima</i>, differing primarily in its shorter, flatter lemmas and shorter anthers. It is also confused with <i>G. elata</i> and <i>Torreyochloa pallida</i>. It differs from the former in having acute glumes with long veins, more evenly dark florets, flatter lemma apices, and paleal keel tips that do not point towards each other. It differs from <i>Torreyochloa pallida</i> in its closed leaf sheaths and 1-veined glumes.</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Spikelets 3.2-6.4 mm long, with 4-8 florets
|[[Glyceria grandis var. grandis|Glyceria grandis var. grandis]]
|-id=key-0-1
|1
|Spikelets 6-10 mm long, with 5-10 florets
|[[Glyceria grandis var. komarovii|Glyceria grandis var. komarovii]]
|}
</div></div><!--

-->{{#Taxon:
name=Glyceria grandis
|authority=S. Watson
|rank=species
|parent rank=section
|synonyms=Glyceria maxima subsp. grandis;Glyceria grandis f. pallescens
|basionyms=
|family=Poaceae
|illustrator=Cindy Roché
|illustration copyright=Utah State University
|distribution=Conn.;N.J.;N.Y.;Wash.;Del.;Wis.;W.Va.;Wyo.;N.H.;N.Mex.;N.C.;Tenn.;Pa.;Ariz.;Ill.;Ind.;Md.;Mich.;Minn.;Miss.;Mont.;N.Dak.;Nebr.;R.I.;S.Dak.;Utah;Vt.;Calif.;Nev.;Va.;Iowa;Oreg.;Colo.;Alaska;Alta.;B.C.;Man.;N.B.;Nfld. and Labr. (Labr.);N.S.;N.W.T.;Ont.;P.E.I.;Que.;Sask.;Yukon;Idaho;Maine;Mass.;Ohio
|reference=None
|publication title=
|publication year=
|special status=Endemic
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/200273ad09963decb8fc72550212de541d86569d/coarse_grained_fna_xml/V24/V24_78.xml
|subfamily=Poaceae subfam. Pooideae
|tribe=Poaceae tribe Meliceae
|genus=Glyceria
|section=Glyceria sect. Hydropoa
|species=Glyceria grandis
}}<!--

-->[[Category:Treatment]][[Category:Glyceria sect. Hydropoa]]