NEW SPECIES OF PLANTS. 11? 



even contour. The leaves are somewhat crowded, 

 and similar in appearance, covered with a minute and 

 viscid pubescence, communicating to the plant a strong 

 and somewhat balsamic odour, very similar to that of 

 Gnaphalium amcricanum. The rays of the flow- 

 er are of a violet blue, and the disk yellow. 



This is a very elegant, hardy, and ornamental 

 perennial, decorating the gardens with a profusion of 

 flowers at a season when all the others are generally 

 destroyed by the frosts. 1 have altered the unmean- 

 ing name, which I had first bestowed from the in- 

 spection of an imperfect specimen. 



— B. Subgenus Phrygia. 



4. Centaurka *americana, annua; caule praealto 

 parcfc ramoso, sulcato; foliis sessilibus, inferioribus 

 oblongo-ovatis repando-denticulatis, superioribus lan- 

 ceolatis acutis; pedunculis apice incrassatis; folio- 

 lis calicinis ovalibus appendiculato-pennatis recur- 

 vatis. 



Habitat. On the banks of streams, and in denu- 

 dated alluvial situations, throughout the plains or 

 prairies of the upper part of Arkansa territory. — 

 Flowering time, July and August. 



Descriptive observation. Stem 4 to 6 feet 

 high, smooth; leaves a little scabrous when dry. The 

 calix is large and partly globular, its segments fur- 

 nished with pennate, recurved, sphacelous, and shi- 

 ning appendages, the internal ones purplish. Rays 

 of the flower very long, and tinged with red. Recep- 

 tacle copiously pilose; the seed also furnished with thf 



