View source for Panicum rigidulum

{{Treatment/ID
|accepted_name=Panicum rigidulum
|accepted_authority=Bosc ex Nees
|publications=
|common_names=Redtop panicum
|basionyms=
|synonyms=
|hierarchy=Poaceae;Poaceae subfam. Panicoideae;Poaceae tribe Paniceae;Panicum;Panicum subg. Agrostoidea;Panicum sect. Agrostoidea;Panicum rigidulum
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Poaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Poaceae subfam. Panicoideae]]</div><div class="higher-taxon"><small>tribe</small>[[Poaceae tribe Paniceae]]</div><div class="higher-taxon"><small>genus</small>[[Panicum]]</div><div class="higher-taxon"><small>subgenus</small>[[Panicum subg. Agrostoidea]]</div><div class="higher-taxon"><small>section</small>[[Panicum sect. Agrostoidea]]</div><div class="higher-taxon"><small>species</small>[[Panicum rigidulum]]</div></div>
|volume=Volume 25
|mention_page=
|treatment_page=page 477
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>perennial; cespitose, not rhizomatous, occasionally purple-tinged throughout, mostly glabrous throughout (except as noted). <b>Culms</b> 35-150 cm, stout, compressed. <b>Sheaths</b> more or less strongly compressed or keeled, sides usually glabrous or sparsely pubescent distally; ligules 0.3-3 mm, membranous, erose or ciliate, cilia often themselves fimbriate; blades 8-50 cm long, 2-12 mm wide, flat or folded, both surfaces usually glabrous or scabridulous, or the adaxial surfaces sparsely pilose basally. <b>Panicles</b> terminal and axillary, 9-40 cm, 1/3 – 3/4 as wide as long, usually dense; ultimate branchlets usually appressed, 1-sided, scabridulous; pedicels 0.5-1.5 mm, usually appressed, sometimes with 1-several slender hairs at the apices. <b>Spikelets</b> usually 1.6-3.8 mm, usually subsessile, lanceolate, green, purple-tinged, or purple, glabrous. <b>Lower</b> glumes 2/5 – 3/4 as long as the spikelets, 3-veined, midveins keeled; upper glumes and lower lemmas subequal or the glumes slightly longer, often spreading slightly apart at the apices, midveins keeled, usually scabridulous apically; lower florets sterile; lower paleas to 2/3 as long as the lower lemmas; upper florets 1.4-2 mm long, 0.6-0.8 mm wide, 2/5 – 3/4 as long as the spikelets, occasionally stipitate, lustrous, with a tuft of minute, thickish hairs at the apices; upper lemmas thick, stiff, clasping the upper paleas throughout their length. <b>2n</b> =18.</span><!--

-->{{Treatment/Body
|distribution=Conn.;N.J.;N.Y.;W.Va.;Del.;D.C;Wis.;B.C.;N.S.;Ont.;Mass.;Maine;N.H.;R.I.;Vt.;Fla.;Ala.;Kans.;Ky.;La.;Mo.;Okla.;Pa.;Tenn.;Tex.;Va.;Puerto Rico;N.C.;S.C.;Md.;Calif.;Miss.;Ark.;Ill.;Ga.;Ind.;Mich.;Ohio;Oreg.
|discussion=<p><i>Panicum rigidulum</i> grows in swamps, wet woodlands, flood-plain forests, wet pine savannahs, marshy shores of rivers, ponds, and lakes, drainage ditches, and other similar wet to moist places; it is rarely found in dry sites. Its range extends from southern Canada to Mexico, Guatemala, and the Antilles.</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Sheaths truncate or broadly auriculate; blade bases much narrower than the subtending sheaths
|[[Panicum rigidulum subsp. abscissum|Panicum rigidulum subsp. abscissum]]
|-id=key-0-1
|1
|Sheaths not truncate or broadly auriculate; blade bases about as wide as the subtending sheaths. 2. Blades usually 5-12 mm wide, flat, mostly glabrous or scabridulous; ligules membranous, 0.3-1 mm long.
|[[#key-0-2| > 2]]
|-id=key-0-3
|3
|Spikelets 1.6-2.5 mm long, usually over 0.6 mm wide, green or purplish-tinged
|[[Panicum rigidulum subsp. rigidulum|Panicum rigidulum subsp. rigidulum]]
|-id=key-0-3
|3
|Spikelets 2.4-3 mm long, usually less than 0.6 mm wide, conspicuouly stipitate, usually purple
|[[Panicum rigidulum subsp. elongatum|Panicum rigidulum subsp. elongatum]]
|-id=key-0-2
|2
|Blades usually 2-7 mm wide, often folded or involute, usually pilose adaxially, at least near the base; ligules membranous, the cilia usually fimbriate, 0.5-3 mm long.
|[[#key-0-3| > 3]]
|-id=key-0-4
|4
|Spikelets 2-2.7 mm long, green or purplish-stained, often obliquely set on the pedicels
|[[Panicum rigidulum subsp. pubescens|Panicum rigidulum subsp. pubescens]]
|-id=key-0-4
|4
|Spikelets 2.6-3.8 mm long, usually purple, slender, erect on the pedicels
|[[Panicum rigidulum subsp. combsii|Panicum rigidulum subsp. combsii]]
|}
</div></div><!--

-->{{#Taxon:
name=Panicum rigidulum
|authority=Bosc ex Nees
|rank=species
|parent rank=section
|synonyms=
|basionyms=
|family=Poaceae
|illustrator=Linda A. Vorobik;Cindy Roché
|illustration copyright=Utah State University
|distribution=Conn.;N.J.;N.Y.;W.Va.;Del.;D.C;Wis.;B.C.;N.S.;Ont.;Mass.;Maine;N.H.;R.I.;Vt.;Fla.;Ala.;Kans.;Ky.;La.;Mo.;Okla.;Pa.;Tenn.;Tex.;Va.;Puerto Rico;N.C.;S.C.;Md.;Calif.;Miss.;Ark.;Ill.;Ga.;Ind.;Mich.;Ohio;Oreg.
|reference=None
|publication title=
|publication year=
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V25/V25_1271.xml
|subfamily=Poaceae subfam. Panicoideae
|tribe=Poaceae tribe Paniceae
|genus=Panicum
|subgenus=Panicum subg. Agrostoidea
|section=Panicum sect. Agrostoidea
|species=Panicum rigidulum
}}<!--

-->[[Category:Treatment]][[Category:Panicum sect. Agrostoidea]]