Nasturtium microphyllum — Details

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Overview

Distribution

Localities documented in Tropicos sources

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Rorippa microphylla (Boenn. ex Rchb.) Hyl. ex Á. Löve & D. Löve:
Mexico (Mesoamerica)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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Localities documented in Tropicos sources

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Nasturtium officinale var. microphyllum Boenn.:
Canada (North America)
Chile (South America)
United States (North America)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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Localities documented in Tropicos sources

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Nasturtium microphyllum Boenn. ex Rchb.:
Canada (North America)
United States (North America)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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Distribution: Europe, C. and W. Asia, Africa and America.
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Physical Description

Morphology

Description

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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

Associations

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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

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

Molecular Biology

Statistics of barcoding coverage: Nasturtium microphyllum

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Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 5
Species With Barcodes: 1
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Statistics of barcoding coverage: Rorippa microphylla

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Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 2
Species With Barcodes: 1
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Conservation

Conservation Status

National NatureServe Conservation Status

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Canada

Rounded National Status Rank: NNA - Not Applicable

United States

Rounded National Status Rank: NNA - Not Applicable

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NatureServe Conservation Status

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Rounded Global Status Rank: GNR - Not Yet Ranked

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Notes

Comments

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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

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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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