The Scottish Naturalist. 323 



XV. COCHLEARIA L. 



28. Officinalis L., B. Common. 



b. alpina, B. 



xvi. Drab a L. 



29. Verna L., B. Not uncommon. 



30. Incana L. Hoy, B. Rousay and Vishall, Evie, D. 



Rather rare. 



xvii. Thlaspi L. 



31. Arvense L. Near Kirkwall and Rousay, D. 



xviii. Capsella Mcench. 



32. Bursa-pastoris Mcench, B. Not uncommon. 



xix. Lepidium L. 



^2- Smithii Hook. Reported from near Wideford. Requires 

 confirmation. 



VIOLACE^E. 

 xx. Viola L. 



34. Palustris L., B. Not uncommon. 



35. Sylvatica Fries. 



a. Riviniana, B. Common. 



36. Tricolor L., B. Common as a weed of cultivation. 



DROSERACE^. 

 xxi. Drosera L. 



37. Rotundifolia L., B. Frequent on heaths on the Mainland, 



Hoy, and Rousay. 



38. Anglica Huds., B. Confined to Hoy and Walls, where it 



is not uncommon. 



POLYGALACE^E. 



XXII. POLYGALA L. 



39. Depressa Wender., B. Common. 



C AR YOPH YLL AC E^E. 



XXIII. SlLENE L. 



40. Maritima With., B. Not uncommon. 



41. Acaulis L., B. Confined to the hills of Hoy, where, Iioav- 



ever, it is common on the rocky ledges. 1 



1 In 1849 I found it abundant on the debris under the rocks of Hoy Hill, 

 but it is now restricted to rocks inaccessible to sheep. — J. T. B. 



