AGGREGATE FLOWERS. 235 



f. 210, with three or five teeth, as m Tragopogon, 

 t. 434, and the Dandelion ; or tubulosl, tubular, cylin- 

 drical and five-cleft, as in Carduus, ^.1112, and Tana- 

 cetitm, t. 1229. The marginal white florets of the 

 Daisy,/! 211, are of the former description, and com- 

 pose its radius^ or rays, and its yellow central ones 

 come under the latter denomination,/! 212, consti- 

 tuting its discus, or disk. The disk of such Howers is 

 most frequently yellow, the rays yellow, white, red, or 

 blue. No instance is known of yellow rays with a 

 white, red, or blue disk. 



An Aggregate flower has a common undivided Re- 

 ceptacle, the Anthers all separate and distant, Jasione 

 only, Engl. Bot. t. 882, having them united at the 

 base, but not into a cylinder, and the florets commonly 

 stand on stalks, each having a single or double partial 

 calyx. Such flowers have rarely any inclination to 

 yellow, but are blue, purple, or white. Instances are 

 found in Scabiosa, t. 659 and 131 l,Dipsaciis, t. 1032 

 and 877, and the beautiful Cape genus ProtecL 



Such is the true idea of an Aggregate flower, but 

 Linna3us enumerates, under that denomination, seven 

 kinds, his favourite number : these are, 



1. The Aggregate flower properly so called, as just 

 mentioned. 



2. The Compound flower previously described. 



3. The Amentaceous flower, or Catkin, of which we 

 have spoken, p. 189. 



