View source for Isoëtes howellii

{{Treatment/ID
|accepted_name=Isoëtes howellii
|accepted_authority=Engelmann
|publications={{Treatment/Publication
|title=Trans. Acad. Sci. St. Louis
|place=4: 385. 1882
|year=1882
}}
|common_names=Howell's quillwort
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Isoëtes melanopoda var. californica
|authority=A. A. Eaton
|rank=variety
}} {{Treatment/ID/Synonym
|name=Isoëtes minima
|authority=A. A. Eaton
|rank=species
}} {{Treatment/ID/Synonym
|name=Isoëtes nuda
|authority=Engelmann
|rank=species
}} {{Treatment/ID/Synonym
|name=Isoëtes underwoodii
|authority=L. F. Henderson
|rank=species
}}
|hierarchy=Isoëtaceae;Isoëtes;Isoëtes howellii
|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 howellii]]</div></div>
|volume=Volume 2
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>becoming terrestrial. <b>Rootstock</b> nearly globose, 2-lobed. <b>Leaves</b> deciduous, bright green, pale to brown or lustrous black toward base, spirally arranged, to 25 cm, pliant, gradually tapering to tip. <b>Velum</b> covering less than 1/2 of sporangium. <b>Sporangium</b> wall brown-streaked to completely brown. <b>Megaspores</b> white, 300–500 μm diam., obscurely tuberculate to rugulate; girdle smooth. <b>Microspores</b> brown in mass, 25–35 μm, spinulose. <b>2n</b> = 22.</span><!--

-->{{Treatment/Body
|phenology=Spores mature in late spring and summer.
|habitat=Wet depressions, vernal pools, and lake margins
|distribution=B.C.;Calif.;Idaho;Mont.;Oreg.;Wash.
|discussion=<p>In many respects, <i>Isoëtes howellii</i> appears similar to <i>I. melanopoda</i>. Small plants with leaves less than 10 cm and megaspores less than 420 μm diam. have been called <i>I. howellii</i> <i></i>var.<i> minima</i> (A. A. Eaton) N. E. Pfeiffer.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Isoëtes howellii
|authority=Engelmann
|rank=species
|parent rank=genus
|synonyms=Isoëtes melanopoda var. californica;Isoëtes minima;Isoëtes nuda;Isoëtes underwoodii
|basionyms=
|family=Isoëtaceae
|phenology=Spores mature in late spring and summer.
|habitat=Wet depressions, vernal pools, and lake margins
|distribution=B.C.;Calif.;Idaho;Mont.;Oreg.;Wash.
|reference=None
|publication title=Trans. Acad. Sci. St. Louis
|publication year=1882
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/eaa6e58056e40c9ef614d8f47aea294977a1a5e9/coarse_grained_fna_xml/V2/V2_438.xml
|genus=Isoëtes
|species=Isoëtes howellii
}}<!--

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