View source for Oryzopsis

{{Treatment/ID
|accepted_name=Oryzopsis
|accepted_authority=Michx.
|publications=
|basionyms=
|synonyms=
|hierarchy=Poaceae;Poaceae subfam. Pooideae;Poaceae tribe Stipeae;Oryzopsis
|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>[[Oryzopsis]]</div></div>
|volume=Volume 24
|mention_page=
|treatment_page=page 167
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>perennial; cespitose, not rhizomatous. <b>Culms</b> 25-65 cm, erect or spreading, basal branching extravaginal; prophylls not visible; nodes glabrous. <b>Leaves</b> mostly basal; cleistogenes not developed; sheaths open, glabrous; auricles absent; ligules membranous, longest at the sides or rounded, ciliate; blades of basal leaves 30-90 cm, remaining green over winter, erect when young, recumbent in the fall, bases twisted, placing the abaxial surfaces uppermost, cauline leaf blades reduced, flag leaf blades 2-12 mm, conspicuously narrower than the top of the sheath. <b>Inflorescences</b> panicles, contracted. <b>Spikelets</b> 5-7.5 mm, with 1 floret; rachillas not prolonged beyond the base of the floret; disarticulation above the glumes, beneath the floret. <b>Glumes</b> subequal, 6-10-veined, apices mucronate; florets terete to laterally compressed; calluses usually less than 1/5 the length of the florets, blunt, distal portions pilose; lemmas coriaceous, pubescent at least basally, 3-5(9)-veined, margins strongly overlapping at maturity, awned, lemma-awn junction conspicuous, lobed, lobes 0.1-0.2 mm; awns more or less straight, deciduous; paleas similar to the lemmas in length, texture, and pubescence, concealed by the lemmas, 2-veined, flat between the veins; lodicules 2, free, membranous, 2-veined; anthers 3; styles 1, with 2 branches; ovaries glabrous. <b>Caryopses</b> falling with the lemma and palea. <b>x</b> = 11, 12.</span><!--

-->{{Treatment/Body
|distribution=Wash.;Wis.;W.Va.;Colo.;Wyo.;N.H.;N.J.;N.Mex.;N.Y.;Pa.;R.I.;Va.;Conn.;Mass.;Maine;Vt.;Ill.;Ind.;Iowa;Idaho;Md.;Ohio;Utah;Minn.;Mich.;N.Dak.;S.Dak.;Mont.;Alta.;B.C.;Man.;N.B.;Nfld. And Labr. (Labr.);N.S.;N.W.T.;Ont.;P.E.I.;Que.;Sask.;Yukon
|discussion=<p><i>Oryzopsis</i> is treated here as a monospecific genus that is restricted to North America. Hitchcock (1951) and Johnson (1945) treated it as including both Eurasian and North American taxa; Freitag (1975) and Tutin (1980) placed the Eurasian species in a separate genus, <i>Piptatherum</i>. Kam and Maze (1974) demonstrated that <i>O. asperifolia</i> differs from both North American and Eurasian species previously included in <i>Oryzopsis</i> in the development of its floret and callus, and in having 2-veined lodicules. Phylogenetic studies based on ITS sequence data have not yielded clear support for any particular treatment of <i>Oryzopsis</i>; they are consistent with the treatment presented here. The North American species previously included in <i>Oryzopsis</i> have been transferred to <i>Achnatherum</i> and <i>Piptatherum</i>.</p>
|tables=
|references={{Treatment/Reference
|id=dore1980b
|text=Dore, W.G. and J. McNeill. 1980. Grasses of Ontario. Research Branch, Agriculture Canada Monograph No. 26. Canadian Government Publishing Centre, Hull, Quebec, Canada. 566 pp.
}}{{Treatment/Reference
|id=freitag1975b
|text=Freitag, H. 1975. The genus Piptatherum (Gramineae) in southwest Asia. Notes Roy. Bot. Gard. Edinburgh 33:341-408
}}{{Treatment/Reference
|id=hitchcock1951a
|text=Hitchcock, A.S. 1951. Manual of the Grasses of the United States, ed. 2, rev. A. Chase. U.S.D.A. Miscellaneous Publication No. 200. U.S. Government Printing Office, Washington, D.C., U.S.A. 1051 pp.
}}{{Treatment/Reference
|id=jacobs2006a
|text=Jacobs, S.W.L., R. Bayer, J. Everett, M.O. Arriaga, M.E. Barkworth, A. Sabin-Badereau, M.A. Torres, F. Vazquez, and N. Bagnall. 2006. Systematics of the tribe Stipeae using molecular data. Aliso 23:349-361
}}{{Treatment/Reference
|id=johnson1945a
|text=Johnson, B.L. 1945. Cytotaxonomic studies in Oryzopsis. Bot. Gaz. 107:1-32
}}{{Treatment/Reference
|id=kam1974a
|text=Kam, Y.K. and J. Maze. 1974. Studies on the relationships and evolution of supraspecific taxa utilizing developmental data: II. Relationships and evolution of Oryzopsis bymenoides, O. virescens, O. kingii, O. micrantka, and O. asperifolia. Bot. Gaz. 135:227-247
}}{{Treatment/Reference
|id=tutin1980a
|text=Tutin, T.G. 1980. Piptatherum Beauv. Pp. 246-247 in T.G. Tutin, V.H. Heywood, N.A. Burges, D.M. Moore, D.H. Valentine, S.M. Walters, and D.A. Webb (eds.). Flora Europaea, vol. 5. Cambridge University Press, Cambridge, England. 452 pp.
}}
}}<!--

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-->{{#Taxon:
name=Oryzopsis
|author=Mary E. Barkworth;
|authority=Michx.
|rank=genus
|parent rank=tribe
|synonyms=
|basionyms=
|family=Poaceae
|distribution=Wash.;Wis.;W.Va.;Colo.;Wyo.;N.H.;N.J.;N.Mex.;N.Y.;Pa.;R.I.;Va.;Conn.;Mass.;Maine;Vt.;Ill.;Ind.;Iowa;Idaho;Md.;Ohio;Utah;Minn.;Mich.;N.Dak.;S.Dak.;Mont.;Alta.;B.C.;Man.;N.B.;Nfld. And Labr. (Labr.);N.S.;N.W.T.;Ont.;P.E.I.;Que.;Sask.;Yukon
|reference=dore1980b;freitag1975b;hitchcock1951a;jacobs2006a;johnson1945a;kam1974a;tutin1980a
|publication title=
|publication year=
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V24/V24_230.xml
|subfamily=Poaceae subfam. Pooideae
|tribe=Poaceae tribe Stipeae
|genus=Oryzopsis
}}<!--

-->[[Category:Treatment]][[Category:Poaceae tribe Stipeae]]