POTAMOGETONACE^. 151 



Flor. Belf. Ditches by Lough Neagh in Massereene Park ; 

 Flor. TJlst. At various points in the course of the Lagan, 

 canal to Lough ^N'eagh; S.A.S. Pollanbum near Glenann ; 

 R.LLP. 

 Derry — Abundant between Coleraine and the sea ; D.M. 



RUPPZA Linn. Tassel Pondweed. 



1. R. xnarltima Linn. 



Salt marshes, and brackish ditches — rare. Fl. mid. July till mid. Sept. 



Down — Brackish ponds at Castle Espie, salt marsh at Xewtownarda, also 

 abundant in brackish marsh by the railway bridge at Conns- 

 water, and on the Kinnegar at Holy wood ; S.A.S. 



Antrim— Among Zoster a on the Mile water shore of BeKast Lough ; 

 TetnpI.eton, 179-i. Abundant in salt marshes at Glynn, and 

 Ballycarry; E.Ll.P. 



2. R. rostellata Koch. 



Salt marshes — rare. Fl. July and Aug. (Cyi. Eib.'). 

 Derry — Plentiful in muddy salt marsh above the Bannfoot near Port- 

 stewart ; S.A.S. 



The two forms of Ruppia have been so much confounded that great 

 part of the former records are useless, specimens, also, are of no value 

 unless they bear mature fruit. The stations accredited, in Flora Bel- 

 fastiensis, to the present species belong really to the preceding, and there 

 is every reason to distrust the notes on these plants as recorded in Flora of 

 Ulster. 



ZAM'N'ZCHEZiIiZA Linn. Hobned Pondwsed. 



1. Z. palustrls Linn. 



Marshes, and ditches, mostly by the sea — rare. Fl. July and Aug. 

 Down — Holywood ; Flor. TJlst. In the Quoile below the rath at Down- 



patrick ; S.A.S. 

 Antrim — Ditches by the Lagan ; Flor. Ulst., and subsequently ; T.H.C. 

 Derry — Common in many places ; D.M. 



2. Z. polycarpa Nolle. 



Brackish ditches — very rare. Fl. mid. June till end of Aug. 

 Down — Abundant in brackish ditches in the long-neglected * ' Victoria 

 Park," and in the reclaimed land between Queen's Quay and 

 the Park; S.A.S., 1872. 



