36 AGGREGATE AND 



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

 Grasses, seep. 191. 



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 a 

 few observations are necessary. 



Linnaeus and his friend Artedi. thought the great 

 natural umbelliferous order could not be divided into 

 good and distinct genera by the seeds or parts of the 

 flower, without taking into consideration the general 

 and partial involucral leaves, which they therefore 

 chose to consider as a part of the fructification, and 

 defined as a calyx remote from the flower. The rays 

 of the umbel, of course, became the subdivisions of a 

 branched receptacle, and the whole umbel was consi- 

 dered as one aggregate flower. It necessarily followed 

 that a Cyme, see p. 180, must be considered in the 

 same light ; nor did the sagacity of Linnasus overlook 

 the arguments in favour of this hypothesis. Many of 

 the umbelliferous tribe, as Heracleum, t. 939, Can- 

 calls Coriandrum, &c., have their marginal flowers 

 dilated, radiant, and more or less inclined to be imper- 

 fect or abortive, thus evincing an analogy with real 

 compound flowers like the Sunflower, which analogy 

 is still more striking between Oenanthe, t. 363, 347, 

 348, and the Marigold, Calendula. So the cymose 

 plants, as Viburnum Opulus, t. 332, bear dilated and 



