Rhamnaceae. 



221 



Adolphia. 

 (Family Rhamnaceae). 



Intricately green- branched 

 shrubs, very spiny by the decus- 

 sate terete granular and puberu- 

 lent branchlets: pith moderate, 

 rounded, continuous. Buds super- 

 posed, the upper at once develop- 

 ing into a recurving spine-branch, 

 the lower minute, with 2 outer and 

 ultimately several inner black- 

 ening scales. Leaf-scars opposite, 

 transverse, minute and indistinct, 

 or lacking, the infra-spinal buds 

 developing as short spurs on 

 which the small spatulate leaves 

 sometimes persist. 



In its opposite spines Adol- 

 phia resembles Colletia. to which 

 the genus is not distantly related; 

 and it suggests Koeberlinia. 



Of Arizona, New Mexico and Mexico. A. infesta. 



Of Lower California. (1). A. californica. 



Winter-character references to Rhamnus: R. alpina. 



Schneider, f. 169; Willkomm, 40, f. 64. R. rat hart int. Bose- 



mann. 48; Fant, 41, f. 39; Schneider, f. 169; Ward, 1:46, f. 



28, 160, f. 76-77; Willkomm, 4, 45, f. 77. R. Frangvla. Bose- 



mann, 49; Fant, 40, f. 36; Schneider, f. 101 ;t Ward, 1:215, f. 



110; Willkomm, 40, f. 66. R. japonica. Shirasawa, 268, pi. 



10. R. lanceolata. Brendel, 27, pi. 1; Hitchcock (3), 9. R. 



fumila. Schneider, f. 101. R. saxatilis. Bosemann, 48; 



Schneider, f. 169. R. utilis. Schneider, f. 169. 



