Wakeman—Pigments of Flowering Plants. 
809 
B. Diphenylethane series. 
1. Pigments referable to diphenyl ethane. 
Genistein. 
C. Diphenylpropane series. 
1. Pigments referable to diphenyl propane. 
Phloretin. 
Butin. 
Saponarin and Vitexin. 
I. Pigments referable to the diphenyl series of hydro¬ 
carbons. 
The only member of this series to which a plant pigment is 
known to be referable is a dimethyl homologue, the ditolpl. 
Pigments referable to ditholyl. 
Ellagic acid occurs quite widely distributed in plants, usually 
accompanied by tannins. It is found in the leaves of Juglans 
regia 1 along with gallic acid andjuglone; in the leaves of Quercus 
pedunculata, * 2 Quercus infectoria } 3 4 Caspinus bet ulus* Haema- 
toxylon campechianum , 5 * Caesalpina brevifolia , 5 Caesalpinia 
coriaria , 3 coriaria myrtifolia , 5 Quebrachia lorentzii? Tamarax 
gallica 7 Tamarax africana 7 Bonabanga moluccana 8 Punica 
granatum 8 Terminalia chebula, 9 Vaccinium vitis ideaea. 10 
Ellagic acid forms small yellowish crystals. It dissolves in 
concentrated sulphuric acid with a citron yellow color. From 
*C. r„ 141, p. 838. 
2 Z. physiol. Chem., 20, p. 511. 
3 Jr. Chem. Soc., 71, p. 1131. 
4 Arch. Pharm., 244, p. 575. 
6 Proc. Chem. Soc., 16, p. 45 ; Jr. Chem. Soc., 77, p. 426. 
* Jr. Chem. Soc., 71, p. 1194. 
7 Jr. Chem. Soc., 73, p. 374. 
8 Nederl. Tijdschr. Fharm., 1887, p. 68. 
•Ber., 42, p. 353. 
10 Chem. News.. 52. p. 78 ; Pharm. Jr., 16, p. 92. 
