2'i CRUCIFERiE. 



48. C. hirsuta, L. Hairy-leaved Lady's Smock, ^ Lamb Cress.' 



Native ; on wall tops, rocky banks, &c. Very common. February 



to April, and sometimes later. Area general. 



This begins to flower considerably earlier tlian C. sylvatica, and by the 



second or third week in April is shedding many of its seeds, when the 



latter is scarcely in full flower. On luxuriant specimens some of the 



flowers have not unfrequently five stamens. 



49. C. sylvatica, Link. 



Native ; about roadside rills and springs ; on banks and walls in 



shady or wooded situations. Very common. From near the 



end of March to May ; again in autumn. Area general. 



This often grows with C. hirsuta on damp walls. It is plentiful in all 



the districts, and sometimes occurs as a weed in the turf of garden-plots 



in the town of Plymouth. 



ARABIS, Z. 



50. A. thaliana, Z. Thale Cress. 



Native ; on dry hedge-banks and walls ; and rarely as a weed in 



arable land. Very common. jMarch to May : sometimes in the 



autumn. Area general. 



Occurs on the outskirts of Plymouth, as at Tothill, Milehouse, &c., 



and is a very frequent annual on walls and dry banks about the towns 



and villages of the Districts. 



51. A. hirsuta, Br. Hairy Wail Cress. 



Native ; on dry, stony, or rocky limestone banks, and in old 

 quarries ; also on walls. Rare, and very local. jMay, June. 

 D. III. Walls at the bottom of Catherine Street, Devonport, and the 

 Laboratory, Mount Wise; Jacob, Fl. part 13: in plenty on 

 the Dockyard wall near St. Mary's Church, 1879. (Between 

 Pennycomequick and Stoke, 1849) ; Keys, Fl. ii. 36. 

 IV. Plentiful about Turnchapel ! Jacob, ibid. Occurs in many places 

 on the limestone from the eastern side of Cattewater on to near 

 Elburton : as at Mount Batten, on rubble and rock at the 

 Oreston Quarries, on two walls, &c., at Pomphlet, at Billa- 

 combe, and near Hay Farm, on the limestone plateau near 

 Elburton, &c. 

 V. Wall near Yealm Bridge, rather plentifully, 1863. 

 Although this is strikingly a species of the limestone, yet its range is 

 less extensive than the area of the limestone beds. 

 Fii-st record : Jacob, 1836. 



A. petrcea. Lam. Wigvor Down, near Meavy, betwixt the gully and 

 the gate leading to Green vil Farm— >S\V Francis Drake and Mr.- Hudson; 



