AGGREGATE FLOWERS. 243 



quently 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 Recep- 

 tacle, 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 Sea- 

 biosa, t. 659, and 1311, Dipsacus, t. 1032 and 877, and 

 the beautiful Cape genus Protea. 



Such is the true idea of an Aggregate flower, but Lin- 

 nasus enumerates, under that denomination, 7 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. 200. 



4. The Glumose, or Chaffy flower, peculiar to the 

 Grasses, see/?. 201. 



5. The Sheathed flower, whose common receptacle 

 springs from a Sheath, as in Arum. 



6. The Umbellate ; and 



7. The Cymose flowers, concerning which two last -ji 

 iQW observations are necessary. 



Linneeus and his friend Artedi thought the great nat- 

 ural un;beUiferous order could not be divided into a:ood 



