View source for Nasturtium

{{Treatment/ID
|accepted_name=Nasturtium
|accepted_authority=W. T. Aiton in W. Aiton and W. T. Aiton
|publications={{Treatment/Publication
|title=in W. Aiton and W. T. Aiton, Hortus Kew.
|place=4: 110. 1812
|year=1812
}}
|common_names=Watercress
|basionyms=
|synonyms=
|hierarchy=Brassicaceae;Brassicaceae tribe Cardamineae;Nasturtium
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Brassicaceae]]</div><div class="higher-taxon"><small>tribe</small>[[Brassicaceae tribe Cardamineae]]</div><div class="higher-taxon"><small>genus</small>[[Nasturtium]]</div></div>
|etymology=Latin nasus, nose, and tortus, distortion, alluding to pungency of plants
|volume=Volume 7
|mention_page=page 166, 226, 229, 232, 245
|treatment_page=page 489
}}<!--

--><span class="statement" id="st-undefined" data-properties="">Perennials; (aquatic, rhizomatous, rooting at proximal nodes); not scapose; often glabrous, sometimes pubescent. <b>Stems</b> prostrate or decumbent, or erect in emergent plants, unbranched. <b>Leaves</b> cauline; not rosulate; petiolate; petiole base sometimes auriculate, blade (pinnately compound in emerged plants, or simple in deeply submerged plants, lateral leaflets petiolulate or sessile, 1–6(–12) pairs), margins entire, repand, or, rarely, dentate. <b>Racemes</b> (corymbose, several-flowered), elongated in fruit. <b>Fruiting</b> pedicels divaricate or descending, slender, (glabrous or adaxially puberulent). <b>Flowers</b>: sepals erect or ascending, oblong [ovate], lateral pair subsaccate or not saccate basally, (glabrous); petals usually white, rarely pink, obovate or narrowly spatulate, (longer than sepals), claw undifferentiated from blade, (attenuate to clawlike base, apex obtuse, acute, or rounded); stamens tetradynamous; filaments (white), not dilated basally; anthers oblong, (apex obtuse); nectar glands (2), lateral, annular or semiannular. <b>Fruits</b> siliques, sessile, usually linear, rarely narrowly oblong, smooth or slightly torulose, straight or slightly curved, terete; valves each obscurely veined, glabrous; replum rounded; septum complete; ovules 25–50 per ovary; style obsolete or distinct; stigma capitate. <b>Seeds</b> plump, not winged, oblong or ovoid; seed coat (minutely to coarsely reticulate), not mucilaginous when wetted; cotyledons accumbent. <b>x</b> = 8.</span><!--

-->{{Treatment/Body
|distribution=North America;n Mexico;Central America;Europe;Asia;n Africa;introduced also in South America;tropical and s Africa;Australia;nearly worldwide.
|discussion=<p>Species 5 (4 in the flora).</p><!--
--><p>There has been considerable disagreement as to whether <i>Nasturtium</i> should be maintained as a distinct genus or be united with <i>Rorippa</i>. Molecular data and a critical evaluation of morphology (I. A. Al-Shehbaz and R. A. Price 1998) clearly show that <i>Nasturtium</i> is much more closely related to <i>Cardamine</i> than it is to <i>Rorippa</i>, and that the two genera should not be united.</p><!--
--><p>Plants of <i>Nasturtium floridanum</i>, <i>N. microphyllum</i>, and <i>N. officinale</i> typically produce compound leaves when submerged in shallow waters or when their branches are emergent. When submerged in deep waters, all three produce simple leaves, and, in that case, it is impossible to distinguish them. The hybrid between <i>N. officinale</i> and <i>N. microphyllum</i>, N. ×sterilis Airy Shaw, is uncommon in North America, having been reported from Connecticut, Idaho, Michigan, and New Hampshire (P. S. Green 1962), and is far more common in Europe, where it has recently been studied thoroughly (W. Bleeker et al. 1999 and references therein). <i>Nasturtium</i> africanum Braun-Blanquet is known from Morocco in northwestern Africa.</p>
|tables=
|references={{Treatment/Reference
|id=green1962a
|text=Green, P. S. 1962. Watercress in the New World. Rhodora 64: 32–43.
}}{{Treatment/Reference
|id=rollins1978a
|text=Rollins, R. C. 1978. Watercress in Florida. Rhodora 80: 147–153.
}}{{Treatment/Reference
|id=shehbaz1988a
|text=Shehbaz, I. A. and R. C. Rollins. 1988. A reconsideration of Cardamine curvisiliqua and C. gambellii as species of Rorippa (Cruciferae). J. Arnold Arbor. 69: 65–71.
}}{{Treatment/Reference
|id=shehbaz1998a
|text=Shehbaz, I. A. and R. A. Price. 1998. Delimitation of the genus Nasturtium (Brassicaceae). Novon 8: 124–126.
}}
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Seeds biseriate, coarsely reticulate, with 25-50(-60) areolae on each side; fruits (1.8-) 2-2.5(-3) mm wide.
|[[Nasturtium officinale|Nasturtium officinale]]
|-id=key-0-1
|1
|Seeds uniseriate, minutely to moderately reticulate, with (75-)100-500 areolae on each side; fruits 0.8-1.2(-1.8) mm wide
|[[#key-0-2| > 2]]
|-id=key-0-2
|2
|Emergent leaves: petiolar bases non-auriculate; blades 3(-5)-foliolate; seeds light or yellowish brown; Florida.
|[[Nasturtium floridanum|Nasturtium floridanum]]
|-id=key-0-2
|2
|Emergent leaves: petiolar bases often minutely auriculate; blades (3-)5-17-foliolate; seeds reddish brown; not Florida
|[[#key-0-3| > 3]]
|-id=key-0-3
|3
|Leaflet margins entire or repand; seeds with (75-)100-150(-175) areolae on each side; filaments 2.5-3.5 mm; petals 4.5-6 mm; petioles and rachises not winged.
|[[Nasturtium microphyllum|Nasturtium microphyllum]]
|-id=key-0-3
|3
|Leaflet margins coarsely dentate or, rarely, sinuate-repand; seeds with 300-450 areolae on each side; filaments 5-7 mm; petals 6-8 mm; petioles and rachises narrowly winged.
|[[Nasturtium gambelii|Nasturtium gambelii]]
|}
</div></div><!--

-->{{#Taxon:
name=Nasturtium
|author=Ihsan A. Al-Shehbaz
|authority=W. T. Aiton in W. Aiton and W. T. Aiton
|rank=genus
|parent rank=tribe
|synonyms=
|basionyms=
|family=Brassicaceae
|distribution=North America;n Mexico;Central America;Europe;Asia;n Africa;introduced also in South America;tropical and s Africa;Australia;nearly worldwide.
|reference=green1962a;rollins1978a;shehbaz1988a;shehbaz1998a
|publication title=in W. Aiton and W. T. Aiton, Hortus Kew.
|publication year=1812
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V7/V7_760.xml
|tribe=Brassicaceae tribe Cardamineae
|genus=Nasturtium
}}<!--

-->[[Category:Treatment]][[Category:Brassicaceae tribe Cardamineae]]