270 SYNGEN. POLYG. FRUSTRA; Centaurea; 
Cyanus, C. squamis calycinis serratis, foliis lineari- 
bus integerrimis ; inferioribus dcntatis. 
C. Calyx scaki seyrated: leaves strap-shaped^ 
very entire ; the lower ones toothed^ 
CORN BLUK-ROTTLE. Cornfields; common. Bea¬ 
con-fields, Newark} Southwell; Alansfield. 
A, July, Aug. 
Scahiosa» C. squamis calycinis ciliatis ovatis, foliis 
pinnatifidis : laciniis lanceolatis subdenia- 
' tis pilosiusculis* 
C. Calyx scales fringed: leaves wing-cleft ; 
segments spear-shaped^ 
GREATER KNAPWEED. Borders of fields, and 
amonffst corn ; r.o+ uncommon. Beacon Hill. Newark; 
Halam; tarnslield. P. July, August. 
