102 



AROMATIC COMPOUNDS AND 



[CH. 



Further, that the blue pigment of the flower is the potassium salt 

 of the purple, and the red acid salt, cyanidin chloride, depicted above, is 

 a so-called oxonium compound of the purple. 



. Pelargonidin, moreover, has been prepared synthetically (Willstatter 

 and Zechmeister, 45). 



The above three pigments, either as glucosides or in the form of 

 methylated derivatives, are found in a number of plants which are listed 

 below (Willstatter, etc., 33-46). The sugar residues or methyl groups 

 may, of course, occupy different positions, thus giving rise to isomers: 



Callistephin 

 Pelar2;onin 



Pelargonidin. 



Monoglucoside of pelargonidin 

 Diglucoside of pelargonidin 



Flowers of Aster {Callistephus chinensis) 

 Flowers of Scarlet Geranium {Pelargonium 

 zonale), pink var. of Cornflower {Centaurea 

 Cyanus) and certain vars. of Dahlia {D. 

 variabilis) 



Cyanidin. 



Flowers of Aster {Callistephus chinensis) 

 Flowers of Chrysanthemum {C. indicmn) 

 Fruit of Cranberry ( Vaccinitcm Vitis-Idaea) 

 Flowers of Cornflower {Centaurea Cyanus), 



Rosa gallica and certain vars. of Dahlia 



(/A variabilis) 

 Flowers of Poppy {Papaver Rhoeas) 

 Fruit of Cherry {Prunus Cerasus) 

 Flowers of Paeony {Paeonia officinalis) 



Flowers of Pansy ( Viola tricolor) 



Flowers of Larkspur {Delphinium consolida) 



Fruit of Virginian Creeper {Ampelopsis quin- 



quefolia) 

 Fruit of Bilberry ( Vaccinium Myrtillus) 



Flowers of deep purple var. of Hollyhock 



{Althaea rosea) 

 Flowers of Petunia {P. violacea) 



Flowers of Mallow {Malva sylvestris) 



Fruit of Gra2)e ( Vitis vinifera) 



