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
}}{{Treatment/ID/Synonym
|name=Isoëtes minima
|authority=A. A. Eaton
}}{{Treatment/ID/Synonym
|name=Isoëtes nuda
|authority=Engelmann
}}{{Treatment/ID/Synonym
|name=Isoëtes underwoodii
|authority=L. F. Henderson
}}
|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, Isoëtes howellii appears similar to I. melanopoda. Small plants with leaves less than 10 cm and megaspores less than 420 μm diam. have been called I. howellii var. minima (A. A. Eaton) N. E. Pfeiffer.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Isoëtes howellii
|author=
|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/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V2/V2_438.xml
|genus=Isoëtes
|species=Isoëtes howellii
}}<!--

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