View source for Ruppia

{{Treatment/ID
|accepted_name=Ruppia
|accepted_authority=Linnaeus
|publications={{Treatment/Publication
|title=Sp. Pl.
|place=1: 127. 1753;, Gen. Pl. ed. 5; 61, 1754
|year=1754
}}
|common_names=Ditch-grass;widgeon grass;Rruppia
|basionyms=
|synonyms=
|hierarchy=Ruppiaceae;Ruppia
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Ruppiaceae]]</div><div class="higher-taxon"><small>genus</small>[[Ruppia]]</div></div>
|etymology=fFor Heinrich Bernhard Ruppius, 1689–1719, a German botanist
|volume=Volume 22
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs,</b> rooting at proximal nodes. <b>Leaves</b>: blade entire proximally, minutely serrulate distally, apex ± obtuse to acute; veins 1. <b>Inflorescences</b> fewer than 20-flowered, at first enclosed by sheathing leaf bases. <b>Flowers</b> bisexual; anthers 2-loculed, locules separated by broad connective; stipe elongating after anthesis. <b>Fruits</b> beaked, long-stipitate; beak erect or slightly recurved.</span><!--

-->{{Treatment/Body
|distribution=Almost worldwide.
|discussion=<p>Considerable confusion exists about North American taxa of <i>Ruppia</i>. Two distinct forms, along with several intermediates, are known: one with short peduncles with four or fewer spirals and another with long peduncles with five or more coils (often many more). Usually, those with few coils are in brackish waters near the coast, whereas those with many coils are inland, often in lakes that have high mineral contents. The forms have been considered variants variants of one species, <i>R. maritima</i> (M. L. Fernald and K. M. Wiegand 1914); more recently they have been accepted at species level (R. F. Thorne 1993). I am adopting Thorne’s concepts.</p><!--
--><p>Species ca. 10 (2 in the flora).</p>
|tables=
|references={{Treatment/Reference
|id=fernald1914b
|text=Fernald, M. L. and K. M. Wiegand. 1914. The genus Ruppia in eastern North America. Rhodora 16: 119--127.
}}{{Treatment/Reference
|id=jacobs1982a
|text=Jacobs, S. W. L. and M. A. Brock. 1982. A revision of the genus Ruppia (Potamogetonaceae) in Australia. Aquatic Bot. 14: 325--337.
}}{{Treatment/Reference
|id=reese19628a
|text=Reese, G. 19628. Zur intragenerischen Taxonomie der Gattung Ruppia L. Z. Bot. 50: 237--264.
}}{{Treatment/Reference
|id=thorne1993d
|text=Thorne, R. F. 1993b. Potamogetonaceae. In: J. C. Hickman, ed. 1993. The Jepson Manual. Higher Plants of California. Berkeley, Los Angeles, and London. Pp. 1304--1310.
}}{{Treatment/Reference
|id=verhoeven1979a
|text=Verhoeven, J. T. A. 1979. The ecology of Ruppia-dominated communities in western Europe. I. Distribution of Ruppia representatives in relation to their autecology. Aquatic Bot. 6: 197--268.
}}
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Peduncle with 5 or more coils in fruit, longer than 30 mm; plants mostly from inland localities
|[[Ruppia cirrhosa|Ruppia cirrhosa]]
|-id=key-0-1
|1
|Peduncle with fewer than 5 coils in fruit, shorter than 25 mm; plants mostly from coastal localities
|[[Ruppia maritima|Ruppia maritima]]
|}
</div></div><!--

-->{{#Taxon:
name=Ruppia
|author=
|authority=Linnaeus
|rank=genus
|parent rank=family
|synonyms=
|basionyms=
|family=Ruppiaceae
|distribution=Almost worldwide.
|reference=fernald1914b;jacobs1982a;reese19628a;thorne1993d;verhoeven1979a
|publication title=Sp. Pl.
|publication year=1754
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V22/V22_418.xml
|genus=Ruppia
}}<!--

-->[[Category:Treatment]][[Category:Ruppiaceae]]