COMPOSITE. 219 
HIERACIUM DOVRENSE. Fr. 
Stated by Fries (Symb. Ilier., p. 129) to have been found in 
Scotland, but not known by British botanists to exist there. 
HIERACIUM RIGIDUM. Hartm. 
Said to occur in Scotland by Pries ; but the plant he supposed 
to be that is, according* to Mr. Backhouse, a form of II. co- 
rvinbosum. 
XANTHIUM SPINOSUM. Linn. 
Dr. II. Bull and Mr. G. S. Wintle have both sent me this 
plant from Hereford, where it appeared in abundance on ground 
on which mud from the streets of the town had been laid. It 
is too tender to have any chance of becoming permanently natural- 
ized in Britain. Dr. Bull informs me that it has also occurred in 
Wales. 
