FLEOWERING PLANTS. 185 
LEMNACEAE. 
Lemna minor, L. Lesser Duckweed. 
Native. First record: Gosselin, 1815. 
Very common everywhere in pools and ditches, and in stagnant 
water generally. 
This minute plant, called in French from the shape of the leaves 
Lentille d’eau, or Water Lentil, is one of the most simple of all 
phanerogamous plants. It is but rarely found in flower, though 
more frequent in that condition than most others of the genus, some 
of which have hardly ever been seen flowering anywhere. 
Lemna gibba, L. 
.Native. First found: Andrews, 1900. 
Very rare. Ditches near Ivy Castle, associated with L. minor 
and L. polyrrhiza (Andrews). 
Lemna polyrrhiza, L. Great Duckweed. 
Native. First record: Babington, 1839. 
Very rare. In a quarry pool at Spur Point, in profusion. In 
ditches behind Ivy Castle, intermixed with Z. mznor, plentiful. 
(Lemna trisulca, L. This plant is included in Gosselin’s old 
list, and very possibly existed here a century ago; but there are no 
specimens in his herbarium, nor has any one met with it in recent 
times. Dr. Bull found it in Sark nearly thirty years ago.) 
POTAMOGETONACEAE. 
Potamogeton polygonifolius, Pour. Oblong-leaved 
Native. First found: Gosselin, 1788. | Pondweed. 
Rare. In deep pools at Grande Mare, and in some of the 
ditches in the neighbourhood. Pool on the eastern side of 
Lancresse. Specimens of this plant from Grande Mare, labelled 
P.natans, are preserved in Gosselin’s herbarium. 
Potamogeton plantagineus, Ducroz. Plantain-leaved 
Native. First record: Babington, 1839. [ Pondweed, 
Very rare. Ina deep quarry pool at L’Islet ; fairly plentiful in 
1891 and 1892 ; but had become scarce in 1899 owing to a portion 
of the pool being drained. Babington found this species ‘in peat 
pits in Grande Mare,’ but many of these have been filled up since 
his time, and I doubt if the plant is still to be found there. 
