View source for Alisma

{{Treatment/ID
|accepted_name=Alisma
|accepted_authority=Linnaeus
|publications={{Treatment/Publication
|title=Sp. Pl.
|place=1: 343. 1753; Gen. Pl. ed. 5; 160, 1754
|year=1754
}}
|common_names=Water-plantain
|basionyms=
|synonyms=
|hierarchy=Alismataceae;Alisma
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Alismataceae]]</div><div class="higher-taxon"><small>genus</small>[[Alisma]]</div></div>
|etymology=ancient Greek name, adopted by Linnaeus from Dioscorides
|volume=Volume 22
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs,</b> perennial, submersed, floating-leaved, emersed, glabrous; rhizomes often present; stolons absent; corms absent; tubers absent. <b>Roots</b> not septate. <b>Leaves</b> sessile or petiolate; petiole triangular; blade with translucent markings absent, linear to ovate, base attenuate to rounded, margins entire, apex obtuse to acute. <b>Inflorescences</b> panicles, of 2–10 whorls, erect, emersed, rarely submersed; bracts delicate, smooth, apex acuminate, surfaces smooth. <b>Flowers</b> bisexual; pedicels ascending; bracts subtending pedicels, lanceolate, shorter than pedicels, apex acuminate; receptacle flattened; sepals erect, not sculptured, herbaceous; petals pink or white, entire; stamens 6–9, filaments filiform, glabrous; pistils 15–20, in ring around margin of flattened receptacle, not radiating in starlike pattern, distinct; ovules 1; styles lateral. <b>Fruits</b> without longitudinal ribs, strongly laterally compressed, abaxial wings absent, lateral wings absent, abaxially 2–3-ribbed, abaxial keel absent, glands absent. <b>x</b> = 7.</span><!--

-->{{Treatment/Body
|distribution=Widely distributed;nearly worldwide.
|discussion=<p>Much controversy surrounds the treatment of Alisma in North America. At present three distinct native species in North America are generally recognized (P. Rubtzoff 1964) as well as the probable occurrence of two introduced species, one in California and the other in Alaska.</p><!--
--><p>Species 9 (5 in the flora).</p>
|tables=
|references={{Treatment/Reference
|id=bj1968a
|text=Björkquist, I. 1968. Studies in Alisma L. II. Chromosome studies, crossing experiments and taxonomy. Opera Bot. 19: 1--138.
}}{{Treatment/Reference
|id=hendricks1957a
|text=Hendricks, A. J. 1957. A revision of the genus Alisma (Dill.) L. Amer. Midl. Naturalist 58: 470--493.
}}{{Treatment/Reference
|id=rubtzoff1964a
|text=Rubtzoff, P. 1964. Notes on the genus Alisma. Leafl. W. Bot. 10: 90--95.
}}{{Treatment/Reference
|id=voss1958a
|text=Voss, E. G. 1958. Confusion in Alisma. Taxon 7: 130--133.
}}
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Style longer than or (equal to) ovary; anthers ellipsoid.
|[[#key-0-2| > 2]]
|-id=key-0-1
|1
|Style shorter than or (equal to) ovary; anthers ovoid to rounded.
|[[#key-0-3| > 3]]
|-id=key-0-2
|2
|Petals with obtuse apex, purplish white to purplish pink; style ± straight; leaf blade ovate to broadly lanceolate; Alaska.
|[[A. plantago-aquatica|A. plantago-aquatica]]
|-id=key-0-2
|2
|Petals with acute apex, purplish pink; style curved proximally; leaf blade narrowly elliptic to lanceolate; California.
|[[A. lanceolatum|A. lanceolatum]]
|-id=key-0-3
|3
|Achenes with 2 abaxial grooves, 1 abaxial ridge; leaves submersed, ribbonlike, or if emersed, blades linear-lanceolate to narrowly elliptic.
|[[A. gramineum|A. gramineum]]
|-id=key-0-3
|3
|Achenes with1 abaxial groove; leaves emersed, rarely submersed or floating, blades ovate to elliptic.
|[[#key-0-4| > 4]]
|-id=key-0-4
|4
|Fruiting heads 2–4 mm diam.; achenes 1.5–2.2 mm; petals 1–3 mm.
|[[A. subcordatum|A. subcordatum]]
|-id=key-0-4
|4
|Fruiting heads 4.1–7 mm diam.; achenes 2.1–3 mm; petals 3.5–6 mm.
|[[A. triviale|A. triviale]]
|}
</div></div><!--

-->{{#Taxon:
name=Alisma
|author=
|authority=Linnaeus
|rank=genus
|parent rank=family
|synonyms=
|basionyms=
|family=Alismataceae
|distribution=Widely distributed;nearly worldwide.
|reference=bj1968a;hendricks1957a;rubtzoff1964a;voss1958a
|publication title=Sp. Pl.
|publication year=1754
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V22/V22_229.xml
|genus=Alisma
}}<!--

-->[[Category:Treatment]][[Category:Alismataceae]]