View source for Isoëtes engelmannii

{{Treatment/ID
|accepted_name=Isoëtes engelmannii
|accepted_authority=A. Braun
|publications={{Treatment/Publication
|title=Flora
|place=29: 178. 1846
|year=1846
}}
|common_names=Engelmann's quillwort
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Isoëtes valida
|authority=(Engelmann) Clute
|rank=species
}}
|hierarchy=Isoëtaceae;Isoëtes;Isoëtes engelmannii
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Isoëtaceae]]</div><div class="higher-taxon"><small>genus</small>[[Isoëtes]]</div><div class="higher-taxon"><small>species</small>[[Isoëtes engelmannii]]</div></div>
|volume=Volume 2
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>aquatic, emergent. <b>Rootstock</b> nearly globose, 2-lobed. <b>Leaves</b> evergreen, bright green, pale toward base, spirally arranged, to 60(–90) cm, pliant, gradually tapering to tip. <b>Velum</b> covering less than 1/4 of sporangium. <b>Sporangium</b> wall usually unpigmented, occasionally ± brown-streaked. <b>Megaspores</b> white, 400–560 μm diam., reticulate, with unbroken lamellate ridges; girdle obscure. <b>Microspores</b> gray in mass, 20–30 μm, smooth to papillose. <b>2n</b> = 22.</span><!--

-->{{Treatment/Body
|phenology=Spores mature in summer.
|habitat=Emergent or in shallow water of lakes, ponds, streams, and ditches
|distribution=Ont.;Ala.;Ark.;Conn.;Del.;Fla.;Ga.;Ill.;Ind.;Ky.;Md.;Mass.;Mich.;Mo.;N.H.;N.J.;N.Y.;N.C.;Ohio;Pa.;R.I.;S.C.;Tenn.;Vt.;Va.;W.Va.
|discussion=<p><i>Isoëtes engelmannii</i> is the most widely distributed quillwort of eastern North America. Plants with larger megaspores, ranging from 480–560 μm, have been called <i>I. engelmannii</i> var. georgiana Engelmann. This variety may represent a tetraploid cytotype. A tetraploid population of <i>I. engelmannii</i> (2n = 44) from northern Florida has larger megaspores characteristic of var. georgiana.</p><!--
--><p><i>Isoëtes engelmannii</i> hybridizes with <i>I. echinospora</i> [ = I. x eatonii Dodge (later synonym = I. x gravesii A. A. Eaton); <i>I. flaccida</i>; <i>I. tuckermanii</i> [ = I. x foveolata A. A. Eaton ex Dodge]; <i>I. lacustris</i>; and <i>I. riparia</i> [ = I. x brittonii Brunton & W. C. Taylor].</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Isoëtes engelmannii
|authority=A. Braun
|rank=species
|parent rank=genus
|synonyms=Isoëtes valida
|basionyms=
|family=Isoëtaceae
|phenology=Spores mature in summer.
|habitat=Emergent or in shallow water of lakes, ponds, streams, and ditches
|distribution=Ont.;Ala.;Ark.;Conn.;Del.;Fla.;Ga.;Ill.;Ind.;Ky.;Md.;Mass.;Mich.;Mo.;N.H.;N.J.;N.Y.;N.C.;Ohio;Pa.;R.I.;S.C.;Tenn.;Vt.;Va.;W.Va.
|reference=None
|publication title=Flora
|publication year=1846
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/eaa6e58056e40c9ef614d8f47aea294977a1a5e9/coarse_grained_fna_xml/V2/V2_513.xml
|genus=Isoëtes
|species=Isoëtes engelmannii
}}<!--

-->[[Category:Treatment]][[Category:Isoëtes]]