View source for Nymphaea tetragona

{{Treatment/ID
|accepted_name=Nymphaea tetragona
|accepted_authority=Georgi
|publications={{Treatment/Publication
|title=Bemerk. Reise Russ. Reich
|place=1: 220. 1775
|year=1775
}}
|common_names=Pygmy water-lily;small white water-lily;nymphéa tétragonal
|special_status={{Treatment/ID/Special_status
|code=F
|label=Illustrated
}}
|basionyms=
|synonyms=
|hierarchy=Nymphaeaceae;Nymphaea;Nymphaea tetragona
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Nymphaeaceae]]</div><div class="higher-taxon"><small>genus</small>[[Nymphaea]]</div><div class="higher-taxon"><small>species</small>[[Nymphaea tetragona]]</div></div>
|volume=Volume 3
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Rhizomes </b>unbranched, erect, cylindric; stolons absent. <b>Leaves</b>: petiole glabrous. <b>Leaf</b> blade abaxially green to dull purple, adaxially green, sometimes mottled with reddish brown or purple, especially on young leaves, ovate to elliptic, 3-13(-14) × 2-11(-13) cm, margins entire; venation radiate centrally, without weblike pattern, principal veins 7-13; surfaces glabrous. <b>Flowers</b> floating, 3-7.5 cm diam., opening and closing diurnally, only sepals and outermost (occasionally innermost) petals in distinct whorls of 4; sepals uniformly green, obscurely veined, lines of insertion on receptacle very prominent, protuberant, forming tetragons; petals 10-17, white; stamens 30-70, yellow-orange, abaxially usually suffused with purple, connective appendage projecting less than 0.2 mm beyond anther; filaments widest above middle, longer than anthers; pistil 5-10-locular, appendages at margin of stigmatic disk boat-shaped, (2-)3-4 × 2-4 mm. <b>Seeds</b> ovoid, ca. 2-3 × 1.5-2 mm, ca. 1.3-1.5 times as long as broad, lacking papillae on surface. <b>2n</b> = 112.</span><!--

-->{{Treatment/Body
|phenology=Flowering summer.
|habitat=Ponds, lakes, and quiet streams
|elevation=0-1200 m
|distribution=Alta.;B.C.;Man.;N.W.T.;Sask.;Alaska;Wash.;Eurasia.
|discussion=<p>Although broadly distributed in the northwest part of the flora, <i>Nymphaea tetragona</i> is apparently not common over the Canadian portion of its range. It was collected once in extreme northwestern Washington but is believed to be extirpated there. True <i>N. tetragona</i> is absent from northeastern North America and, now, from the conterminous United States, where this name has usually been applied to what is here segregated as <i>N. leibergii</i>. In size and shape of leaves and flowers the two taxa are very similar. They differ in the leaf mottling often present in developing leaves of <i>N. tetragona</i> but absent in <i>N. leibergii</i>; the distinctly tetragonal appearance of the receptacle in <i>N. tetragona</i>; and in the longer carpellary appendages, the presence usually of more stamens, and purple-colored stamens and pistils in <i>N. tetragona</i>. Only in living plants is it apparent that leaves of <i>N. leibergii</i> are thicker with impressed veins abaxially compared to the relatively thin leaves with raised veins in <i>N. tetragona</i>. Although distinctions in sepal and petal apices (often acute in <i>N. tetragona</i> and often rounded in <i>N. leibergii</i>) were the basis for the establishment of Castalia leibergii, the characters are variable in both taxa and thus of limited utility in distinguishing them.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Nymphaea tetragona
|authority=Georgi
|rank=species
|parent rank=genus
|synonyms=
|basionyms=
|family=Nymphaeaceae
|phenology=Flowering summer.
|habitat=Ponds, lakes, and quiet streams
|elevation=0-1200 m
|distribution=Alta.;B.C.;Man.;N.W.T.;Sask.;Alaska;Wash.;Eurasia.
|reference=None
|publication title=Bemerk. Reise Russ. Reich
|publication year=1775
|special status=Illustrated
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V3/V3_529.xml
|genus=Nymphaea
|species=Nymphaea tetragona
}}<!--

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