376 :NAIADAGEM. IFotamogeton.. 



7. P. uitens "Weber — BrigM-lewved Pond-weed. 



Districts I. — III. — V. — VII. VIII. IX. — XI. XII. 

 Lat. 52°-55i°. South to IS'ortli. Type, Scottisli. 



Lowland. Lakes and rivers ; rare. Fl. Jime-Jnly. 



I. In a large lake at Castlegregory, Kerry, 1864 {Moore) : Jowrn.. 

 of Bot., 1864, p. J26. StiU at Castlegregory, but not plentiful j. 

 near tbe mouth of the Hesk, Killarney : R. W. S. 1888 8f 8g.— 

 III. and V. Eiver Barrow about Monasterevan ; and — VII. Black 

 river north of Monasterevan : Hwrt 1885 (as P. rufescens). Lough 

 Derevaragh : Levinge i8g4. — VIII. Stream from Lough Keel, 

 Achill Island {More) : Jowrn. of Bot. i88g. — IX. Lough Bofin, 

 Leitrim, 1871 {W. T. Dyer) : Serl. Brit. Mm. — XI. Stream pin- 

 ing Loughs Akibbon and Gartan, and in Eanny Lough, Panet ; Sa/rt. — 

 XII. Lough Aghery, Down, 1887 {Stewart): Flor. N.-E. Annsboro 

 Lake, Down, and in the Sixmilewater, near Antrim : Stewart iSg^f..- 



Pirst recorded for the British Isles by David Moore, from 

 Castlegregory, in 1864. 



Var. lATrFOLiTis Tis. — I. Eiver Laune near the lake, Killarney t 

 M. W. S. i8go (perhaps a hybrid — P. nitens x perfoliatus). 



8. P. lucens Linn. — Shining Pond-weed. 



Districts I. II. III. IV. V. VI. VII. VIII. IX. X. XI. XII. 



Lat. 51f°-55i°. Throughout Ireland. Type, English-British. 

 Lowland. Lakes, rivers, and pools ; local. Fl. June-July. 



P. decipiens Nolte. 



Districts — _ — — V. — VII. — _ _ XI. — 

 Lat. 53^°-55°- Middle and North. Lowland ; apparently rare. 



V. In the canal by the Boyne near Ifavaii, 1868 {Charles 

 Bailey) : B. Ex. C. Pep. 7<?69— still there, 1897 ; E. W. S. Eoyal 

 canal near Clonsilla, Co. Dublin, 1889; ^. F". ;S'.— VII. Lough 

 Dereveragh, fine and plentiful in one spot : Linton i8g6. — 

 XI. Long Lough near Fort Eoyal, Eathmullan : Sa/rt z88j y. 



Usually regarded as a hybrid between P. lucens and P. perfoliatm.. 



P. Zi%ii Eoth. 

 P. angustifolius Presl. 



Districts I. V. VI. VII. VIII. IX. X. XI. XII. 



Lat. 52°-55°. South to North. Lowland ; rather rare. 



