MONOCOTYLEDONES. 71 
Var. tervestre (Meyer). I think this var. was 
from bog, Stove, Deerness, but not certain. Seen by 
Mr Ar. Bennett. 
395. P. PERFOLIATUS (Linn.), Pond-weed. Common. 
396. P. POLYGONIFOLIUS (Pour.), Broad-leaved 
Pond-weed. Fairly common. 
My specimen is from Loch of Airy, Stronsay. 
Var. lancifolvus (Asch. and Greebn.) is the prior 
name for the var. ericetorum (Syme) in “ English 
Botany” (Mr A. Bennett). Found by me in October 
1908. 
397. P. NITENS (Weber), Pond-weed. 
Lochs of Harray and Boardhouse (Dr Boswell) ; 
Kirbuster, Orphir (July 1896). 
Var. salicifolvus (Fries.) Kirbuster, Orphir (July 
1896, M. Spence); named by Mr A. Bennett. 
398. P. pRa&LONGUS (Wulf.), Long-stalked Pond- 
weed. 
Loch, Tankerness (21st Sept. 1911, M. Spence). 
This plant had not been previously found in Orkney. 
It grows in Caithness and the Feeroes, but has not 
been found in Shetland. 
399. P. pusILLuS (Linn.), Small Pondweed. 
Kirbuster Loch (Dr Boswell); St. Mary’s Loch, 
Holm (M. Spence). 
Var. bBerchtoldi (Fieber). Dr Grant found this 
very rare variety of pusillus near Stairwaddy, 
Stromness. My specimens were got 21st Sept. 1911. 
