The Flora of Derbyshire - Checklist, Maps and Sample Accounts

THIS IS A DRAFT

The species account below is an early version, drafted around 2003. It has been provided here to aid understanding, but please be aware it may not fully tally with the up-to-date map and statistics shown below.

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Dates
First year: 1863
Latest year: 2006

County Status
Native

Family
Lemnaceae

Total records held
39

Grid Square Count

1987-2007	Ever
Monads: 11	19
Tetrads: 10	17
Hectads: 3	7

Conservation Status
A

Account last edited
Dec 22 2006

Explanation of terms

Species Details

Greater Duckweed is a very rare native aquatic that grows floating on still and slowly-moving waters. Currently it is only recorded from the Trent Valley {Melbourne Pool SK3924; Alvaston SK3834, Sawley Cut SK4730} , there is a specimen from the first location in Derby Museum. Previously it was recorded elsewhere in the eastern part of the county as well. Nationally it is a lowland species that rarely flowers in Britain (Preston et al. 2002).