Potamogeton.) NAIADACE. 305 
(Var. psruDo-FLUITANS Syme, to which-the previous plant 
was referred in Cyb. 1898, appears to be the ordinary, sub- 
merged state of P. polygonifolius from which, as already 
mentioned, the Kerry plant differs in several particulars.] 
P. plantagineus Ducvr. P. coloratus Hornem. 
District -- — — — — — — VII — 
Native. In bog ditches. Very rare and local. Peren. 
June—July. 
VIII. Rather plentiful in roadside bog-ditches between 
Sleveen and the River Brick north of Lixnaw: R.W.S. 1903. 
First record in 1903: R.IW.S., Irish Nat., p. 115. 
This plant proves to be unexpectedly rare in Kerry as, 
indeed, it is throughout the greater portion of south-west 
Ireland ; it will probably, however, be found in other 
localities in the north of the county. Although often growing 
in peaty or boggy ditches, this plant is almost confined to 
calcareous areas. t 
P. rufescens Schrad. P. alpinus Balb. 
Districts — — Tl. IV. — VI. — VII. — 
Native. Lakes, pools, ditches, &c. Rare and local. Ann. 
(fide Fryer). June—July. 
III. About an old boathouse-cutting on the west bank of 
the Caragh River near Lickeen House, 1889-1913.—IV. At 
the south-east end of Caragh Lake, Glencar : R.W.S. 1890.— 
VI. In several localities about the Lower Lake, Killarney, as 
in two or three ponds on Ross Island, near the mouth of the 
River Flesk and in the Muckross Hotel boathouse bay : 
R.W.S. 1889, and in 1912.— VIII. In a ditch near old Lixnaw 
House: R.W.S. 1891, and in 1902. 
First record in 1889: R.W.S., Journ. of Bot. 
[P. nancroxatus Smith.—IV. Near the Gap of Dunloe, 
Killarney (Moore) Babington : Cyb. 1866. This record is 
most probably an error. As at present known, P. lanceo- 
latus—usually regarded as a hybrid between P. heterophyllus 
and P. pusillus—is known in Ireland only from one locality 
in Clare and two in north-east Galway.] 
P. heterophyllus Schreb. 
Districts — — — — Vv. We —~ ~— — 
Native. Lakes and pools. Very rare but locally abundant. 
Peren. June—July. 
U 
