FLORA OF THE EAST RIDING OF YORKSHIRE. 1 33 



872. Centaurea nigra. Linn., m. 



(Black Knapweed. " Hard-heads," E.R.D.). 



Native, Brit., 1-7. Aug., I. 



Common in all the divisions. 



873. C. ScabiOSa. Linn., 82 

 (Great Knapweed). 



Native, Brit., 3, 4, 5, 6, 7. Aug., 1. 



Frequently on the Wolds and dry places in Holderness ;* 

 with white flowers in Heslington Fields (B.). Newstead, on 

 Settrington Road (M.B.S.). 



874. C. OyanuS. Linn., 98. 

 (Born Blue Bottle). 



Colonist, Brit., 1-7. July, HI. 



Frequently in cornfields ; near Beverley (Dr. Hull, Scaum's 

 Bev.) ; and amongst many other alien Centaurese on the 

 dock wastes.* 



876. C. aspera. Linn. 



877. C. Calcitrapa. Linn., 17. 



878. C solstitialis. Linn. 



C. melitensis. Linn. 



C diffusa. Lamk. 

 Aliens. 



Common on the Hull docks waste ground. 



879. Cichorium Intybus. Linn., 65. 



(Chicory). 

 Colonist, Eng., i, 2. 



On the clay cliff's of Holderness ;* near Beverley (Dr. Hull); 

 by the R. Hull near Driffield (J.T.H.); and very common 

 with the dock aliens, Hull. 



