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| MaltaWildPlants.com by Stephen Mifsud |
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Wolffia arrhiza (Rootless Duckweed) |
Wolffia arrhiza (ARACEAE.)
Images for this profile are taken from the Maltese Islands at or after year 2000. |
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| Nomenclature and Basic Information |
Species name : |
Wolffia arrhiza (L.) Wimmer
Published in (L.) Horkel ex Wimmer, Fl. Schles. ed. 3, 140 (1857) | Synonyms :
(basionym or principal syn.) |
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Plant Family : | Araceae
Juss. (The Arum Family)
8 species from the Araceae family are recorded from the Maltese Islands. | English name(s) : | Rootless Duckweed | Maltese name(s) : | Maltese name not known | Status for Malta : | Casual or accidental alien species introduced in Malta rather recently and which is short-lived or resticted in small populations for a short time without becoming widespread. | Frequency : | Very Common Common Frequent
Scarce Rare
Very Rare Extinct
| Growth form : |
Raunkiaer lifeform [info]: HYDROPHYTE (living only in water)
Germination [info]: Monocotyledon | Legal Protection [link]: | Not Protected by Law (LN200/2011 or LN311/2006) | Red List (1989) : | Not listed in the Red Data Book of the Maltese Islands | Flowering Time : | Mar-May | Colour of Flowers: | Inconspicuous |
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| Species Description and Distribution |
Habitat in Europe: |
Data will be available in the next update of this website. |
Preferred habitat in Malta: |
Casually found in flooded areas such as water reservoirs and stagnant waters. Possibly introduced from dumped aquarium material in reservoirs in wetlands. Apparently short lived in Malta. |
Botanical Description: |
Fronds 0.5-1 mm, ellipsoid or subglobose, light green. |
Chromosome number: |
2n=50 |
Distributional range: |
From England and Lithuania southwards to W.C. Portugal, Sicilia and Bulgaria. |
Distributional map in Europe
and the Mediterranean region (2018):
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Occurrences in Europe.
(from Flora Europaea pre year 1993): |
Austria and Liechtenstein, Belgium, Britain (excl. Northern Ireland and Channel islands), Bulgaria, Corse, Czeck Republic and Slovakia, France (incl. Monaco and Channel Islands but excluding Corse), Germany, the Netherlands, Spain (incl. Andorra but excl. the Balaerics), Hungary, Italy (excl. Sicily and Sardignia), ex-Jugoslavia, Portugal, Poland, Romania, Russia and former USSR, B C W Sicily and/or Malta |
Occurrences in Europe and the Mediterranean region.
(Euro+Med Checklist, 2017) -
Country codes |
Ab(A) Ag Al †Au(A) Be(B) Br Bu By Ca(T) Co Ct Ga(F) Ge He Ho Hs(S) Hu IJ It Lu Ma Po Rf(C E S) ?Rf(K) Rm Si(S) Sl Sr Uk(U) [Cs Lt Rf(C) Si(M) Sk] |
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| Submit further info on this species |
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