8 FLORA ORCADENSIS. 
abundant on these farms. Field near Grainbank, 
Kirkwall (Dr Fortescue, 1911). 
OrpER V.—VIOLACE. 
Genus XVII.—VIOLA. 
40. V. paLustris (Linn.), Marsh-violet. Fairly 
common. 
41. V. Rivintana (Reich.), Wood-violet. Common. 
42, V. TRICOLOR (Linn.), Pansy. Common. 
43, V. ARVENSIS (Murr.), Field-pansy. Fairly 
common, 
OrpER VI.—DROSERACEZ. 
Genus XVIII—DROSERA (Linn.), Sundew. 
44, D. ROTUNDIFOLIA (Linn.) Fairly common on 
peaty heaths. 
45. D. LONGIFOLIA (Linn.), Long-leaved Sundew. 
Very doubtful. Dr Gillies reported it about 1820, 
and Dr Clouston in 1831. 
46. D. ANGLICA (Huds.), Great English Sundew. 
This is fairly common. It is found in the bogs, 
Hoy ; peat moss, Hillside, Birsay ; and very plenti- 
fully in White Moss, St. Andrews. WD. longifolia is 
not found farther north than 62 degs. N. latitude, 
whilst wrglica extends as far north as the White Sea. 
Longifolia is found in Caithness. 
