312 POTAMOGETONACE^. [Potamogeton. 



6. P. heterophyUus (Scbreb.) — Various-leaved Pond-weed. 

 Districts 12345--89 10-12 

 Lat. 51°-56°- From South to North of Ireland. 

 Type in Great Britain, British, inclining to English. 



Ponds, ditches, and rivers ; not unfrequent. Fl. June, July. 



A singular plant, with long lanceolate submerged leaves, 

 occurring in the river Boyne, below Navan, may belong 

 to the present species ; though Professor Babington refers it 

 to P. sparganuyblius (Laest.) 



7. P. lucens CLinn.) — Shinimg Pond-weed. 

 Districts 1-345--8 9 10 1112 

 Lat. 51°-56°. Throughout Ireland. 

 Type in Great Britain, English, inclining to British, 



Lakes, rives, pools, &c. ; frequent. Fl. June, July. 



[P. longifolius (Gay). A single fragment picked up float- 

 ing on Lough Corrib has been figured under this name in 

 " English Botany," Suppl. tab. 2847, but we think that too 

 little is known of the plant to entitle it to a place in the Irish 

 Flora, until seen and studied in its actual place of growth.] 



8. P. prselongus (Wulf.) — Long-stalked Ppnd-iveed. 

 Districts l____6-89--12 

 Lat 51°-55°- West and North of Ireland. 

 Type in Great Britain, Scottish. 



Ditches and lakes ; very local and rare. Fl. June, July. 



1. Blackwater, Kerry (Dr. Taylor) ; C. C. B.—6. Near 

 Limerick ! Prof, Harvey. — 8. In Lough Cullin, Mayo ; 

 A. G. M. — 9. In two lakes east of Foxford ; A. G. M.— 

 12. Ditches by the Lagan, between the first and second 

 locks ; Flor. Ulst. Lough Mourne ; Flor. Belf. In a small 

 lake above Kilrea, Derry. In Lough Neagh ; and Lough 

 More, near Carrickfergus, Antrim ; D. M. 



9. P. nitens (Web.) — Bright-leaved Pond-weed. 

 Districts l-_-___-- __12 

 Lat. 51°-55°. South-west and North-east of Ireland. 

 Type in Great Britain, Scottish or British. 

 Lakes ; very rare. Fl. June, July. 



