= 
i. - . ee 
1820 SyNGRNESIA. “NECESSARIA. — 
594, CENTAUREA. L, “(Knapweeds &c.) 
_ Calix various. Rays funnelform, irregular. 
= Receptacle setose. Pappus simple, often pilose. — ee 
Generally herbaceous; leaves alternate, simple or pinna- 
sifid; flowers terminal. 
- Spxcizs. 1. C. Cyanus. (Blue-bottle). Not very com- 
Donly naturalized. 2. miyra. 3, jacea. 4. benedicta. Sv 
Sd 
 ealcitrapa. All naturalized, not indigenous. a 
_ A vast and compound genus indigenous to Europes 
_ Barbary, Egypt, the Levant and Siberia. !n the southern 
— nseneres by = at epee Video. 
| Oxpen. V.—POLYGAMIA 1 NECESSARIA, 
ae (Radial tore only fertile. ) ; 
595, CHAPT ALIA. Ventenat. 
Calix subimbricated, many- cleaved. Fomtniat’ 
_ florets of two kinds, in 2 series, external radiate, 
internal naked. Discal florets bilabiate. Re- | 
. — naked. Pappus capillary. 
ae be at it 
Was. From’ irginia to Florida, ge sandy men 
—Root perennial, fibrous. Leaves covered on the 
r than the leaf. Calix oblon 
hemisphere only a single doubtful species has been bi- 
asd pa, leaves radical, usually to- 
Seats y / 
pice ‘ith a cotton like tomentum; scape tomentose, much He 
i 
