16 FLORA ORCADENSIS. 
Genus XXXVI.—OXALIS (Linn.) 
91. O. ACETOSELLA (Linn.), Wood Sorrel. 
Low found this growing in considerable abund- 
ance on Calf of Flotta in 1774. It is also found 
on Ryssa Little. In 1906, Mr Omond, Kirbuster, 
gathered specimens on the Orphir shore and sent me 
some. I have specimens too from Dr J. 8. Flett, 
gathered in April 1893. 
OrpER XIII.—LEGU MINOS 4. 
Genus XXXVIL—LUPINUS (Linn.) 
92. L. NOOTKATENSIS (Donn.), Blue Lwpons. 
This plant grows luxuriantly on several open, 
gravelly heaths, and is spreading slowly but surely. 
It has the power of extracting nitrogen from the 
atmosphere, which, becoming fixed in the soil, pro- 
duces grass on barren soils. Hobbister, Stenness ; 
Lyking, Voy, and Warth, Sandwick; hill ground to 
south of Barony, Birsay. It is not native—not even 
of Great Britain. 
Genus XXXVIIL—ULEX (Linn.) 
93. U. ruROPaUs (Linn.), Gorse. 
Introduced, local, and found in most parishes. 
Genus XXXIX.—CYTISUS (Linn.) 
94. C. SCOPARIUS (Link), Broom. Scarce. 
Above U.F. Manse, Stenness ; valley east of Stoney 
Hill, Harray ; Smoogro, Orphir, and elsewhere—in- 
troduced. 
