50 HAMAMELIDACEAE 



RISES. Currant. Gooseberry. 



Deciduous often prickly shrubs with soft brownish wood 

 with minute ducts in more or less evident tangential rows 

 and rather heavy medullary rays; terete or somewhat angled 

 moderate twigs; roundish continuous colored pith; alternate 

 transverse or openly U-shaped somewhat raised leaf-scars with 

 3 bundle-traces; no stipule-scars; ovate or round somewhat 

 lobed and toothed moderate or small leaves; small perfect 

 polypetalous flowers, with cup- or salver-shaped calyx, cluster- 

 ed or racemed from the axils; and small inferior several-seed- 

 ed berries. Because they harbor the Cronartium stage of the 

 blister-rust (Peridermium) of pine, most species of Ribes are 

 viewed with disfavor, and their importation is 1 prohibited by 

 many States. 



1. Leaves with prominent sessile resin-glands. R. americanum. 

 Leaves without resin-glands. 2. 



2. Leaves' truncate or cuneate at base: calyx-tube long 



and slender. (Golden currants). 3. 

 Leaves not cuneate: calyx-tube shorter. 4. 



3. Calyx-tube twice as long as sepals. -R. odoratum. 

 Calyx-tube little longer than sepals. R. aureum. 



4. Prickly at least at the nodes: leaves pubescent. 5. 

 Stems not prickly: leaves glabrescent. 7. 



5. Petioles pubescent and also with gland-tipped hairs: 



fruit usually prickly. R. Cynosbati. 



Petioles gray-pubescent, scarcely glandular. 6. 



6. Fruit bristly. R. Grossularia. 

 Fruit neither bristly nor prickly. R. oxyacanthoides. 



7. Petiole shorter than blade: buds glabrous. R. alpinum. 

 Petiole longer, fimbriate: buds pubescent. R. vulgare. 



Family HAMAMELIDACEAE. Witch Hazel Family. 

 A small family including such trees as Liquidambar, which 

 yields the valuable sweet-gum lumber; chiefly shrubs. 



CORYLOPSIS. 

 Deciduous shrubs with slender or moderate rounded zig- 



