FLORA OF THE EAST RIDING OF YORKSHIRE. 69 



137. Brassica Sinapioides. Ro/h., 63. 



(Black Mustard). 

 Colonist, Eng-., 1-2. June, I. 



Drainsides near Hull. 



Brassica Rapa. Linn. 



(Rape). 

 Alien. 

 Near Hull Docks. 



139. Brassica sinapistrum. Boiss., 112. 



(Charlock, "Brassies," and Ketlock). 



Colonist, Brit., 1-7. June, I. 



Every cornfield. 



140. Brassica alba. Boiss., 82. 



(White Mustard). 



Colonist, Eng., 2, 4. June, I. 



Cornfields, South Cave. All the mustards are, or have 

 been, much cultivated on the rich alluvium bordering the 

 Humber, as on Sunk Island, Holderness. 



142. Diplotaxis tenuifolia. DC, 41. 



(Wall Rocket). 



Denizen, Eng., 5. 



Rare. Kirkham Abbey (M.B.S.). 



143. Diplotaxis muralis. DC, 53. 



(Sand Rocket). 



Denizen, Eng., 3, 4. 



Common. Waste places in chalk pits at Hessle, and on 

 chalky, gravelly roads near Hull. 



