84 



SYNGENESIA. 



iiSEUs has seldom taken it into the account to charac- 

 terise a species, for it is found often to depend upon 

 a difference of heat, chmate, soil, and culture 3 and it 

 is remarked, that red, is more easily changed into 

 white and blue 3 blue, into white and yellow 3 yellow, 

 into white: and white, into purple. 



While colour is the most uncertain character of 

 the Corolla, the figure of the petals of the same spe- 

 cies is more constant than that of the fruity hence 

 Linnaeus advises to arrange under the same Genus 

 such plants as agree invariably in the Calyx, Petals, 

 and Stamina. 



ORDER 4. 



POLYGA- 

 MIA. 



NECESSA. 

 RIA. 



Tlie central 

 Elorets hav- 

 ir.fT hUimina 

 only, and tiie 

 Florets of the 

 tircumfti- 

 •tucconly 

 TisUilla. 



No British Plant of tliis Order, 



GARDEN MARIGOLD grows wild in the 

 southern countries of Europe, as tlie south of France 

 and Italy. This Genus, Calendula, has fourteen spe- 

 cies. Of this si>ecies there are several varieties. Ac- 

 cording to Linna?us's obsei"vations these flowers are 

 open from nine in the morning till three in the after- 

 noon. The regular expansion of flowers attracted 

 early notice ; and in the poems of Rowley there is an 

 allusion to this property in the Marigold. 



<* The Mary-bud that shutte;h with the light. 



