View source for Elatine

{{Treatment/ID
|accepted_name=Elatine
|accepted_authority=Linnaeus
|publications={{Treatment/Publication
|title=Sp. Pl.
|place=1: 367. 1753
|year=1753
}}
|common_names=Waterwort;élatine
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Crypta
|authority=Nuttall
}}
|hierarchy=Elatinaceae;Elatine
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Elatinaceae]]</div><div class="higher-taxon"><small>genus</small>[[Elatine]]</div></div>
|etymology=Greek name for a plant with firlike leaves
|volume=Volume 12
|mention_page=page 348
|treatment_page=page 349
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs,</b> submersed or emergent aquatic, glabrous. <b>Stems</b> erect, ascending, decumbent, or prostrate, with longitudinal air spaces, rooting at nodes. <b>Leaves</b>: stipules membranous; petiole present or absent; blade margins entire, with hydathodes. <b>Inflorescences</b>: flowers usually solitary, sometimes 2[–3] per node. <b>Pedicels</b> present or absent. <b>Flowers</b>: sepals 2–4, connate basally, equal or 1 smaller, not carinate, apex obtuse; petals (0 or) 2–4, apex obtuse; stamens [0–]1–8; pistil 2–4-carpellate, ovary 2–4-locular, apex truncate; styles 2–4; stigmas 2–4. <b>Capsules</b> membranous. <b>Seeds</b> 2–33[–44] per locule, brown to yellowish brown, straight or curved (nearly circular in <i>E. californica</i>), surface with hexagonal, rectangular, elliptic, or ± round pits (pits oriented with longer dimension at right angles to length of seed). <b>x</b> = 9.</span><!--

-->{{Treatment/Body
|distribution=North America;Mexico;South America;Europe;Asia;Africa;Pacific Islands;Australia.
|discussion=<p>Species ca. 25 (10 in the flora).</p>
|tables=
|references={{Treatment/Reference
|id=duncan1964a
|text=Duncan, W. H. 1964. New Elatine populations in the southeastern United States. Rhodora 66: 47–53.
}}{{Treatment/Reference
|id=fassett1939a
|text=Fassett, N. C. 1939. Notes from the herbarium of the University of Wisconsin. No. 17. Elatine and other aquatics. Rhodora 41: 367–377.
}}{{Treatment/Reference
|id=fernald1917a
|text=Fernald, M. L. 1917. The genus Elatine in eastern North America. Rhodora 19: 10–15.
}}{{Treatment/Reference
|id=fernald1941a
|text=Fernald, M. L. 1941b. Elatine americana and E. triandra. Rhodora 43: 208–211.
}}
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Petals 2; capsules 2-locular.
|[[Elatine minima|Elatine minima]]
|-id=key-0-1
|1
|Petals usually 3–4, sometimes 0; capsules 3–4-locular.
|[[#key-0-2| > 2]]
|-id=key-0-2
|2
|Sepals 4; petals 4; capsules 4-locular.
|[[#key-0-3| > 3]]
|-id=key-0-3
|3
|Seeds curved 90–180°; pedicels 1.5–2.5(–3.5) mm, recurved in fruit; w United States.
|[[Elatine californica|Elatine californica]]
|-id=key-0-3
|3
|Seeds straight or curved to 15º; pedicels 0.1–23 mm, erect; Quebec.
|[[Elatine ojibwayensis|Elatine ojibwayensis]]
|-id=key-0-2
|2
|Sepals 2–3 (rarely 4 in E. triandra); petals 3 (sometimes 0 in E. ambigua); capsules 3-locular.
|[[#key-0-4| > 4]]
|-id=key-0-4
|4
|Pedicels recurved in fruit, 0.5–2.5 mm.
|[[Elatine ambigua|Elatine ambigua]]
|-id=key-0-4
|4
|Pedicels erect, 0–0.5 mm.
|[[#key-0-5| > 5]]
|-id=key-0-5
|5
|Stamens 1–6, number variable within plant.
|[[Elatine heterandra|Elatine heterandra]]
|-id=key-0-5
|5
|Stamens 3.
|[[#key-0-6| > 6]]
|-id=key-0-6
|6
|Seed pits ± round, (9–)14–17 per row.
|[[Elatine brachysperma|Elatine brachysperma]]
|-id=key-0-6
|6
|Seed pits angular-hexagonal, (13–)16–35 per row.
|[[#key-0-7| > 7]]
|-id=key-0-7
|7
|Seeds ellipsoid, pit length 3–5 times width; stipule margins entire.
|[[Elatine chilensis|Elatine chilensis]]
|-id=key-0-7
|7
|Seeds oblong or slenderly cylindric, pit length 1–3 times width; stipule margins dentate.
|[[#key-0-8| > 8]]
|-id=key-0-8
|8
|Leaves reddish green; seed pit length 1–2 times width.
|[[Elatine rubella|Elatine rubella]]
|-id=key-0-8
|8
|Leaves light green to green; seed pit length 2–3 times width.
|[[#key-0-9| > 9]]
|-id=key-0-9
|9
|Leaf blades linear, lanceolate or narrowly oblong, apices acute or obtuse.
|[[Elatine triandra|Elatine triandra]]
|-id=key-0-9
|9
|Leaf blades obovate or broadly spatulate, apices rounded to shallowly emarginate.
|[[Elatine americana|Elatine americana]]
|}
</div></div><!--

-->{{#Taxon:
name=Elatine
|author=Hamid Razifard; Gordon C. Tucker; Donald H. Les
|authority=Linnaeus
|rank=genus
|parent rank=family
|synonyms=Crypta
|basionyms=
|family=Elatinaceae
|distribution=North America;Mexico;South America;Europe;Asia;Africa;Pacific Islands;Australia.
|reference=duncan1964a;fassett1939a;fernald1917a;fernald1941a
|publication title=Sp. Pl.
|publication year=1753
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V12/V12_1045.xml
|genus=Elatine
}}<!--

-->[[Category:Treatment]][[Category:Elatinaceae]]