64 FLORA ORCADENSIS. 
361. P. Bistorra (Linn.), Snake-weed. 
In summer of 1911 J. Omond, Orphir, sent one he 
had found outside the garden of Swanbister. J. Firth, 
Finstown, gave me a plant he had found in a field in 
Firth. These are probably escapes. It is also given 
by P. Neil. 
362. P. vivipARUM (Linn.), Alpine Bostort. Local 
and scarce. 
West side of Rousay ; Egilshay (Dr Duguid); side 
of hill above peat bog, Shapinsay (Wm McKay). It 
is more abundant on the hill-side above Pierowall, 
Westray, than any other place I know. 
OrpDER XLII.-—-EMPETRACEA. 
Genus CLXXV.—EMPETRUM (Linn.), Crowberry. 
363. E. NiaRuM, (Linn.), Blackberry. Common on 
all the hills. 
Mr Patrick Neil says :—“ In Deerness we saw very 
strong ropes made from the shoots of the crowberry 
heath.” This practice is still continued. 
OrpDER XLIII—EUPHORBIACE. 
Genus CLXXVI.—EUPHORBIA (Linn.) 
364. EH. Hettoscopia (Linn.), Sun Spurge. Fairly 
common. 
365. E. PepLus (Linn.), Purple Spurge. 
This is not a native, but grows so abundantly year 
after year as a weed in gardens—such as Daisybank, 
Kirkwall—that it deserves mention here. 
