Lemna
Small duckweed ( Lemna minor)
The duckweed ( Lemna ) are a genus of flowering plants in the family Araceae ( Araceae ).
Features
There are two lateral, rearward columns, from which emerge the lateral shoots to the foliage elements. The members each have a root. Central nerves are present, lateral nerves are present or absent. The roots have no leading strand. The root cap is rounded or pointed. The ovary has one or more fixed seed. The seeds are ribbed.
Occurrence
The genus is distributed worldwide, except for arctic and subarctic regions.
System
According to the Flora of Pakistan, the genus comprises about 15 species, the flora of North America are a number of species from 13 at.
In Central Europe, three species are indigenous:
- Hunchback duckweed ( Lemna gibba L.)
- Small duckweed ( Lemna minor L. )
- Duckweed ( Lemna trisulca L.)
Other species (selection):
- Lemna aequinoctialis Welwitsch
- Lemna minuta Humb. , Bonpl. & Kunth
- Lemna obscura (Austin ) Daub
- Lemna parodiana Giardelli
- Lemna perpusilla Torrey
- Lemna turionifera Landolt
- Lemna Valdiviana Philippi
- Lemna yungensis Landolt
Of this step on the skewness duckweed (L. aequinoctialis Welwitsch ), the Petite duckweed (L. minuta Humb. , Bonpl. & Kunth ) and the Red Duckweed (L. turionifera Landolt ) as neophytes in Central Europe.