Overview

Distribution

Range Description

This species occurs from Europe south to NW Africa, and east occurs only in some countries such as Iran, Afghanistan and Pakistan (Hedge 1968), up to Himalayas. It has apparently been introduced to Yemen, Japan, Australia, New Zealand, Canada and the United States. This species is known from only two localities in western Iran (Hedge 1968, Karami et al. 2001), and a few additional sites in the lowlands of the Caspian Sea (Naqinezhad 2006).
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Distribution: Europe, C. and W. Asia, Africa and America.
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Physical Description

Morphology

Description

Differs from Nasturtium officinale R. Br. only by its narrow, linear fruit and seed characters as mentioned in the key. This has 2n=64 (while Nasturtium officinale has 2n=32), apparently an allotetraploid of Nasturtium officinale.

Leaves and stem turn purplish in autumn. Siliquae 15-22 mm long, usually 1 mm broad., slender on up to 20 mm long pedicels, spreading; valves smooth glabrous; seeds uniseriate, c. 0.8 mm long, with c. 100 polygonal depressions on each face.

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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology

R. microphylla will grow in a very wide variety of wetlands, including streams, rivers, ponds, lakes, canals, flushes and seasonally inundated hollows in pasture.


Systems
  • Freshwater
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Associations

Foodplant / parasite
colony of Spongospora nasturtii parasitises live root of Rorippa microphylla x nasturtium-aquaticum (R. x sterilis)

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Foodplant / feeds on
larva of Amalorrhynchus melanarius feeds on Rorippa microphylla

Foodplant / feeds on
larva of Drupenatus nasturtii feeds on Rorippa microphylla

In Great Britain and/or Ireland:
Foodplant / parasite
colony of sporangium of Peronospora parasitica parasitises live Rorippa microphylla
Remarks: season: 1-4

Foodplant / feeds on
larva of Poophagus sisymbrii feeds on Rorippa microphylla

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Life History and Behavior

Cyclicity

Flower/Fruit

Fl. Per.: April July.
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Nasturtium microphyllum

The following is a representative barcode sequence, the centroid of all available sequences for this species.


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Statistics of barcoding coverage: Nasturtium microphyllum

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 4
Specimens with Barcodes: 5
Species With Barcodes: 1
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Barcode data: Rorippa microphylla

The following is a representative barcode sequence, the centroid of all available sequences for this species.


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Statistics of barcoding coverage: Rorippa microphylla

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 2
Specimens with Barcodes: 2
Species With Barcodes: 1
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2014

Assessor/s
Akhani, H.

Reviewer/s
Lansdown, R.V.

Contributor/s

Justification
This species is classed as Least Concern as it is widespread with stable populations and does not face any major threats.
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National NatureServe Conservation Status

Canada

Rounded National Status Rank: NNA - Not Applicable

United States

Rounded National Status Rank: NNA - Not Applicable

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NatureServe Conservation Status

Rounded Global Status Rank: GNR - Not Yet Ranked

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Population

Population

R. microphylla is classed as Extinct in the Czech Republic and Endangered in Austria, Switzerland and Sweden but appears to be widespread and abundant throughout much of its European range.


Population Trend
Stable
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Threats

Major Threats

There are no known significant past, ongoing or future threats to this species.

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Management

Conservation Actions

Conservation Actions

R. microphylla is classed as Extinct in Czech Republic and Endangered in Austria, Switzerland and Sweden but otherwise there are no conservation measures in place or needed. The rarity of this species in the Middle East requires further studies to ensure conservation of few reported localities.

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Wikipedia

Nasturtium microphyllum

Nasturtium microphyllum is an aquatic plant species widespread across Europe and Asia, and naturalized in the United States, Canada, Mexico, Central America, Australia, and other places. It occurs in wet locations generally at elevations less than 1500 m. It has been reported from every Canadian Province except Nova Scotia and Saskatchewan. In the US, it is fairly common in New England, New York, and Michigan, with scattered populations in the southern and western parts of the country.[2][3][4]

References[edit]

  1. ^ The Plant List
  2. ^ Flora of North America v 7 p 490, Nasturtium microphyllum
  3. ^ Reichenbach, Heinrich Gottlieb Ludwig. 1832, Flora Germanica Excursoria 683, Nasturtium microphyllum
  4. ^ Löve, Áskell & Löve, Doris Benta Maria. 1948. Iceland University Institute of Applied Science Deptartment of Agriculture Report, Reykjavik, 3: 109, Rorippa microphylla
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Notes

Comments

This species is confined to the N.W.F.P. area, while the previous one is present almost throughout Pakistan. Sterile hybrid between the 2 species may also be found. Hedge (l.c. 215) records it from Kohat: Lamond 1565 (E); Rech.f. 30228 (W).
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Names and Taxonomy

Taxonomy

Comments: Exotic in the USA; a native plant (Rorippa floridana) was formerly confused with this (Rollins, Crucifers of North America, 1993). LEM 7Jan95. Sometimes included in Rorippa nasturtium-aquaticum (Nasturtium officinale), but recognized as distinct by Kartesz (1994 checklist) and by Rollins.

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