View source for Spirodela

{{Treatment/ID
|accepted_name=Spirodela
|accepted_authority=Schleiden
|publications={{Treatment/Publication
|title=Linnaea
|place=13: 391. 1839
|year=1839
}}
|common_names=Duck-meal
|basionyms=
|synonyms=
|hierarchy=Lemnaceae;Spirodela
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Lemnaceae]]</div><div class="higher-taxon"><small>genus</small>[[Spirodela]]</div></div>
|etymology=Greek speira, winding, and delos, distinct
|volume=Volume 22
|mention_page=
|treatment_page=page 145
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Roots </b>(1–)2–21 per frond, abaxial surface at node. <b>Fronds</b> floating (only turions sink to bottom), 2–10, coherent in groups, each obovate-circular, flat or gibbous, 1.5–10 mm, margins entire; air spaces in tissue; reproductive pouches 2, lateral, at base from which daughter fronds and flowers originate, triangular; veins (3–)5–16(–21), from point in proximal part of frond (node); small bifid 2-cleft membranous scale (interpreted as prophyllum) enveloping base of frond, covering point of attachment of roots; anthocyanins present (especially on abaxial surface); pigment cells present (visible in dead fronds as brown dots); turions present or absent, brownish olive, circular-reniform, smaller than growing frond. <b>Flowers</b> 1(–2) per frond, surrounded by small utricular, membranous scale; stamens 2, 4-locular. <b>Seeds</b> 1–3, longitudinally ribbed. <b>x</b> = 10, 18, 23.</span><!--

-->{{Treatment/Body
|distribution=Nearly worldwide.
|discussion=<p>Species 3 (2 in the flora).</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Fronds 1–1.5 times as long as wide, with 7–16(–21) veins and 7–21 roots, 1 or 2 perforating scale
|[[Spirodela polyrrhiza|Spirodela polyrrhiza]]
|-id=key-0-1
|1
|Fronds 1.5–2 times, as long as wide, with (3–)5–7 veins and (1–)2–7(–12) roots, all perforating scale.
|[[Spirodela punctata|Spirodela punctata]]
|}
</div></div><!--

-->{{#Taxon:
name=Spirodela
|author=
|authority=Schleiden
|rank=genus
|parent rank=family
|synonyms=
|basionyms=
|family=Lemnaceae
|distribution=Nearly worldwide.
|reference=None
|publication title=Linnaea
|publication year=1839
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V22/V22_578.xml
|genus=Spirodela
}}<!--

-->[[Category:Treatment]][[Category:Lemnaceae]]