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   31 Jan 2023      ()
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Spirodela oligorrhiza   (Dotted Duckweed)


Spirodela oligorrhiza  (ARACEAE.) 
Images for this profile are taken from the Maltese Islands after year 2000.

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Profile Date Jan-2009 (taxon update: none)
Citation for this page Mifsud, S. (2022). Spirodela oligorrhiza - datasheet created on Jan-2009. Retrieved from MaltaWildPlants.com on 31-Jan-2023

Nomenclature and Basic Information

Species name :

Spirodela oligorrhiza(Kurz) Hegelm
Published in Lemnac. 147 (1868)

Synonyms :
(basionym or principal syn.)

Lemna oligorrhiza Kurz
Full list of synonyms : [Euro+Med] [PlantList] [IPNI] [POWO] [Catalogue of Life] [Worldplants.de]

Plant Family :

Araceae Juss. (The Arum Family)
10 species from the Araceae family are recorded from the Maltese Islands.

English name(s) :

Dotted Duckweed

Maltese name(s) :

Lemna ta' ftit gheruq

Status for Malta :

Naturalised Alien. Species that was introduced in Malta after year 1492 (Columbus' discovery of the New World) and spreads and integrates to form established, non-invasive populations. Species may become become invasive if it widespreads rapidly.

Frequency :

Very Common     Common    Frequent     Scarce     Rare    Very rare    Extinct

Growth form :

Raunkiaer lifeform [info]: HYDROPHYTE ( living only or mostly in water )
Germination [info]: Monocotyledon

Legal Protection :

Not legally protected till the last update of this website (2/Mar/2022)

Red List (1989) :

Not listed in the Red Data Book of the Maltese Islands

Flowering Time :

February – June

Colour of Flowers:

Inconspicuous

Toxicity:

Not particularly toxic

Name Derivation :

Spirodela:
oligorrhiza:

Planting in rural areas :

Can be planted in rural areas according to ERA Guidelines

Remarks :

Recentely reported as a neophyte from Malta (see paper in links below) but possibly occurring in Nalta for a much longer time and simply neglected with the widespread Lemna minor, of whch difference is a minimal to the naked eye unless plants are not studied carefully. A New record for the Maltese Islands discovered by Stephen Mifsud in April 2008.


Description, Habitat and Distribution
Habitat in Europe: Data will be available in the next update of this website.
Preferred habitat in Malta: Flooded areas, namely open reservoirs, stagnant water bodies in valleys, temporary ponds. Nitrophilous plant hence often present in water polluted from nitrate leeching.
Botanical Description: with fronds 2-5 mm and roots 2-5 per frond, has been recorded from rice-fields in N.W. Italy (S. of Matara) and is perhaps becoming naturalized.

Distributional map in Europe
and the Mediterranean region (2018):
Occurrences in Europe and the Mediterranean region.
(from Euro+Med Checklist, 2019)
  Country codes  
[Ca(T) Eg nIt]

Links & Further literature (0 papers)

Google Web

Google Images

Google Scholar

Research Gate

Wikipedia

JSTOR

GBIF

Med Checklist

Cat. of Life

EoL

IPNI

World Flora Online

Plants of the World Online

Vienna Virt. Herb.

RBGE Herbarium

KEW Herbarium

MNHN

Arkive

IUCN

CABI
Kindly Email if there are papers and publications about local studies or information about this species to be included in the list above.

Species Images (5 images)
   Spirodela oligorrhiza   -   Image Code: SPROR-0.
   Spirodela oligorrhiza   -   Image Code: SPROR-1.
   Spirodela oligorrhiza   -   Image Code: SPROR-2.
   Spirodela oligorrhiza   -   Image Code: SPROR-3.
   Spirodela oligorrhiza   -   Image Code: SPROR-4.

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