BEBBERIDACEAE 39 



infected with the cluster-cup fungus (Aecidium}, it spreads 

 black rust (Puccinia) to wheat. 



BERBERIS. Barberry. 



Deciduous or in other species evergreen shrubs with hard 

 yellow wood with minute diffused ducts slightly larger in 

 spring, and line medullary rays; slender angular monopodial 

 branches with roundish homogeneous pith; alternate 5-ranked 

 ovoid buds with several scales; crescent-shaped raised leaf- 

 scars typically with 3 bundle-traces; rather small apparently 

 simple (unifoliolately compound) leaves often clustered on 

 spurs or replaced by 1- to 3-pronged spines on shoots; small 

 perfect polypetalous yellow flowers clustered in the axils or 

 racemed; and small ellipsoid or oblong usually 1-seeded berries. 



1. Fruit blue, glaucous; twigs green. B. aristata. 

 Fruit red: twigs red or brown. 2. 



2. Leaves entire: fruits usually solitary on a stalk. 



(Asiatic barberries). 3. 

 Leaves distinctly toothed. 5. 



3. Twigs downy. B. Wilsonae. 

 Twigs glabrous. 4. 



4. Becoming rather tall. B. Thunbergii. 

 Compact. (Box barberry). B. Thunbergii minor. 



5. Leaves green. 6. 

 Leaves purple. 7. 

 Leaves variegated. 8. 



6. Fruit red or purplish. (European barberry). B. vulgaris. 

 Fruit yellow. B. vulgaris lutea. 

 Fruit white. B^ vulgaris alba. 



7. Leaves of ordinary size (2X4 cm.). B. vulgaris atropurpurea. 

 Leaves distinctly larger. B. vulgaris macrophylla. 



8. Leaves white-marked. B. vulgaris albo-variegata. 

 Leaves yellow-bordered. B. vulgaris aureo-marginata. 



MAHONIA. 



Evergreen shrubs with rather hard wood with minute 

 ducts in flame-like pattern, and unequal coarse wedge-shaped 



