470 SYNGENESIA— POL.-FRUSTRAN. Centaurea. 



14 or 2 feet high, branched, moderately spreading, leafy, unin- 

 terruptedly winged, from the decurrent bases of the lanceolate, 

 acute, entire, wavy leaves of the branches. Radical leaves 4 or 5 

 inches long, lyrate j their lobes alternate, acute, toothed or 

 jagged 3 terminal one large. FL solitary at the end of each 

 branch, bright yellow. Calyx-scales downy, each of the middle 

 ones terminating in a large, spreading, needle-shaped, yellowish 

 thorn, accompanied at the base by 4 or more small, slender, 

 spreading bristles ; several of the lower scales bearing only such 

 bristles, with a rudiment of the central thorn. Radiant florets 

 not much larger than those of the disk. Seeds obovate, smooth. 

 Down unequal, rough, shorter than the hairs of the receptacle, 

 which are extremely slender. 



