COMPOUND FLOWERS. 245 



find to fail. The seeds and flowers of the umbelliferous 

 family are quite sufficient for our purpose, while the in- 

 volucrum is very precarious and changeable ; often de- 

 ficient, often immoderately luxuriant, in the same genus. 

 In the cymose plants every body knows the real parts of 

 fructification to be abundantly adequate, the involucrum 

 being of small moment ; witness that most natural genus 

 Cornus. For all these, and other reasons, to particular- 

 ize which would lead me too far, I have, p. 191, rec- 

 koned the Umbel and Cyme modes of flowering, and not 

 themselves aggregate flowers. 



