POM ACE A E (APPLE FAMILY) 



8 a Outer calyx lobes pinnately lobed 9 



b Outer calyx lobes not pinnately lobed 13 



9 a Stipules pinnately lobed 



MANY-FLOWERED ROSE. (R. multiflbra* ) 

 b Stipules not pinnately lobed 10 



10 a Calyx lobes or stalks of flowers with glandular hairs. . n 

 b Calyx lobes or stalks of flowers not with glandular hairs 12 



11 a Climbing shrub; styles exserted beyond the top of re- 



ceptacle PRAIRIE ROSE. (R. setigera*) 



b Erect or spreading shrub ; styles not exserted as in a 



Moss ROSE. (R. gdlllca*) 



12 a Stipules with glandular hairs; styles not exserted beyond 



the top of the receptacle DOG ROSE. (R. canina*) 



b Stipules not with glandular hairs; styles exserted beyond 



the top of the receptacle. . MUSK ROSE. (R. moschata*) 



13 a Leaflets shining above, hairy beneath 



JAPANESE ROSE. (R. rugbsa*) 

 b Leaflets not hairy beneath .... CHINA ROSE. (R. chinensis*) 



ii POM ACE AE. Apple Family. 

 i S6RBUS. 



1 a Leaves simple WHITE BEAM TREE. (S. aria*) 



b Leaves compound 2 



2 a Leaflets usually hairy on both sides 



EUROPEAN MOUNTAIN ASH. (S, aucupdria*) 

 b Leaflets not hairy on both sides 3 



3 a Leaflets pointed at apex; fruit % in. or less broad 



AMERICAN MOUNTAIN ASH. (S. americdna.) 

 b Leaflets blunt at apex; fruit }4 in. or more broad 



LARGE-FRUITED MOUNTAIN ASH. (S. scopullna.) 

 z COTONEASTER FIRE THORN. (C. pyracdntha*) 



3 PfRUS PEAR. (P. communis*) 



4 CRATAfeGUS. 



1 a Thorns more or less curved ; leaves broadly ovate, 



doubly toothed 2 



b Thorns straight; leaves obovate or ovate 4 



2 a Corymbs and lower surface of leaves densely hairy 



RED-FRUITED THORN. (C. mollis.) 

 b Corymbs and lower surface of leaves not densely hairy 3 



3 a Calyx lobes entire; leaves rounded or heart-shaped 



at base WASHINGTON THORN. (C. corddta*) 



b Calyx lobes toothed at base; leaves often tapering at 



base PRIMROSE THORN. (C. pruinbsa.) 



4 a Thorns Vz in. or less long; leaves ovate, 3-15 lobed 



or cleft; cultivated species 



ENGLISH HAWTHORN. (C. oxyacdntha*) 

 b Thorns % in. or more long; leaves obovate or broadly 



ovate 5 



167 



