Spirodela polyrhiza (L.) Schleid.
(Greater Duckweed)

Taxonomic hierarchy:
SpeciesSpirodela polyrhiza (Greater Duckweed)
FamilyARACEAE (lords-and-ladies)
OrderALISMATALES (pond plants)
ClassMAGNOLIOPSIDA (flowering plants)
PhylumTRACHEOPHYTA (vascular plants)
KingdomPLANTAE (plants)
DomainEukaryota (eukaryotes)
LifeBIOTA (living things)
Records of Spirodela polyrhiza (Greater Duckweed) :
1: Spirodela polyrhiza (Greater Duckweed)
25 Aug 2013 OSGR: TQ15 51° 20’ N, 0° 20’ W Vice County: Surrey (VC 17) England
floating in steel tank
Image 1: Fronds - floating on water - enlargedImage 2: Frond - top view - enlarged - white backgroundImage 3: Frond - underside - highly enlarged - white background
2: Spirodela polyrhiza (Greater Duckweed)
11 Jun 2003 OSGR: ST48 51° 30’ N, 2° 50’ W Vice County: Monmouth (VC 35) United Kingdom
on surface of water in ditch
Image 1: Plants - close-upImage 2: Plants - close-up (2)Image 3: Plants growing on surface of ditch
3: Spirodela polyrhiza (Greater Duckweed)
22 May 2000 OSGR: SU56 51° 30’ N, 1° 10’ W Vice County: Berks (VC 22) England
Image 1: Fronds on water surfaceImage 2: Fronds, with other duckweeds
4: Spirodela polyrhiza (Greater Duckweed)
29 May 1999 OSGR: SU56 51° 30’ N, 1° 10’ W Vice County: Berks (VC 22) England
odd fronds amongst L. minuta and Azolla
Image 1: Fronds on water surfaceImage 2: Fronds on water surface (2)Image 3: Fronds on water surface (3)Image 4: UndersidesImage 5: Undersides (2)
5: Spirodela polyrhiza (Greater Duckweed)
9 Jun 1975 OSGR: TQ20 50° 50’ N, 0° 20’ W Vice County: West Sussex (VC 13) England
Image 1: Plants - side viewImage 2: Plants - on water surface - enlarged

Spirodela polyrhiza (Greater Duckweed) may be included in identification literature listed under the following higher taxa:

NBNNBN (data.nbn.org.uk) has a distribution map for Spirodela polyrhiza (Greater Duckweed)
BioInfoBioInfo (www.bioinfo.org.uk) has 1 host/parasite/foodplant and/or other relationships for Spirodela polyrhiza (Greater Duckweed)
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