By Thomas Bruges Flower, Esq. 197 
sides. P. Fl. July, September. Area, 1. 2.3.4.5. Frequent and 
generally distributed throughout Wilts. C. nigra, (Linn.) occasionally 
occurs with the outer row of florets barren and radiant, but is not 
common.—f. ©. decipiens (Thuill). This form which is not un- 
frequent in Wilts and the West of England, occurs with flowers 
usually (perhaps always) radiant, and is a more elegant plant with 
the pericline generally smaller and less globular, and the branches 
more wiry than in the last variety; its involucral appendages 
being more irregular. This may possibly be the C. nigrescens, 
(Bab.) and of Continental botanists, and probably may be distinct 
from the radiant form of C. nigra, (Linn.) although it is difficult 
to decide to which of the two forms some specimens ought to be 
referred. 
-2. C. Cyanus, (Lion.) Corn Knapweed, or Blue-bottle. Cyanus 
means Sky-bue, aud is applied to describe the exquisite tint of the 
flowers; hence the English name Blue-boitle. Engl. Bot. t. 277. 
Locality. Corn-fields on chalk and gravel. A. Fl. June, August. 
Area, 1.2.3.4. 5. 
South Division. 
1. South-east District, “Corn-fields in the neighbourhood of 
Salisbury,” Major Smith and Mr. James Hussey. ‘ Amesbury,” 
Dr. Southby. “Pewsey,” Fev. T. F. Ravenshaw. 
2. South Middle District, Corn-fields on Salisbury Plain, and 
Westbury Downs. 
3. South-west District, Corn-fields at Warminster and Corsley. 
North Division. 
4. North-west District, Corn-fields near Chippenham and 
Bromham. 
5. North-east District, “Beyond Martiusell,” Jor. Marib. 
“Great Bedwyn,” Mr. William Bartiett. ; 
Stem 2 or 3 feet high, much branched, covered with a loose 
cottony down. orets of the disk small, purple; of the ray, few, 
larger, bright blue, spreading. The most elegant of the native 
species of Centaurea, and not uncommon in Wiltshire corn-fields. 
It is a pernicious weed to the farmer, and requires his greatest care 
to eradicate. 
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