304 B USH-FB UITS 



North America, it is much more abundant in the Old World, 

 where the botany of the subject becomes exceedingly complex, 

 owing to the endless variety and frequent intermixture of forms. 

 The following list includes only species native to North America 

 north of Mexico, and such European and Asiatic species as are 

 known to be in cultivation in the United States. 



A. Fruit somewhat hemispherical, concave beneath, parting from 

 the receptacle when ripe ; drupelets sometimes few in 

 number, falling away separately (Raspberries) . 

 B. Leaves simple; flowers large; prickles none; fruit and 

 receptacle flat and broad, 

 c. Stems ascending, soft-woody. Nos. 1, 2, 3. 

 cc. Stems above ground nearly or quite herbaceous; plants 

 low and delicate. 4, 5, 6. 

 BB. Leaves simple ; flowers small ; stems more or less prickly, 

 c. Stems frutescent, low and trailing. 7. 

 cc. Stems upright, shrubby. 8, 9. 

 BBB. Leaves compound, of 3-5 pinnate or pedate leaflets, 

 c. Stems annual, herbaceous; fruit usually of few grains. 

 D. Unarmed. 10, 11, 12. 

 DD. Armed with minute slender prickles. 13. 

 cc. Stems biennial and woody, prickly; receptacle oblong. 

 D. Fruit hemispherical; petals small, erect, white. 

 14, 15, 16, 17, 18, 19. 

 DD. Fruit oblong; petals large, red. 20. 

 BBBB. Leaves pinnate, evergreen; flowers double. 21. 

 AA. Fruit, or collective drupelets, adhering to the juicy pro- 

 longed receptacle, mostly ovate or oblong and black; 

 flowers white. 



B. Stems upright ; plant propagating by suckers. 22, 23, 

 24, 25, 26. 

 BB. Stems trailing; plant propagating by tips. 27, 28, 29, 

 30, 31, 32, 33, 34, 35. 



1. RuBUS ODORATUS, Linn. — Purple -flowering raspberry. Thimble- 

 berry, Mulberry (erroneously). 



Stem shrubby, erect, 3-5 feet (9-15 decimeters) high, 

 branched; leaves large, cordate at base, 3-5 lobed, the middle 

 one often prolonged, mucronately serrulate-toothed; stipules 

 nearly free, deciduous, peduncles and calyx densely clothed with 

 purplish, very clammy, glandular hairs, extending to upper parts 

 of stem; peduncles many-flowered, compound; flowers very 

 large, sepals tipped with a long appendage, as long as the 



