R0SACE2E. 235 



« f Calyx-tube short and nearly flat, not enclosing the carpels .... 9 



I Calyx-tube closing over the carpels or seeds . . 14 



r Calyx single 10 



9<j Calyx double, having as many external bracts as divisions, and alter- 



L nating with them 12 



..^ f Calyx-segments 5 11 



1 Calyx-segments about eight. Carpels dry and distinct when ripe 3. Deyas. 

 1 , f Carpels dry, opening when ripe 2. Spie^a. 



I Carpels succulent, forming a kind of granulated berry ... 5. Rttbtts. 

 , 9 J Carpels dry, ending in a long jointed awn ....... 4. Avens. 



1 Carpels without awns, small and seed-like 13 



f Carpels few, on a minute dry receptacle 8. Sibbaldia. 



13 -l Carpels numerous, on a small, flat, dry receptacle ... 7. Potentil. 



L Carpels numerous, on a large, succulent receptacle . 6. Steawbeeeey. 



r Trees or shrubs. Calyx-tube fleshy. Fruit succulent or fleshy . . 15 

 14<*{ Herbs. Calyx-tube dry, small, with hooked bristles forming a burr 



I 12. Ageimony. 



{Fruit enclosing from 1 to 5 cells or hard nuts, arranged round the cen- 

 tral axis, and each with 1 or 2 seeds 14. Pyeus. 

 Fruit enclosing several hairy, seed-like carpels irregularly placed 

 13. Eose. 



These Genera are usually distributed into three Tribes, considered 

 by some botanists as distinct Orders, viz. : — 



1. Amygdaleje. Calyx deciduous. Carpels 1, free. Genus: — 1. Petjnus. 



2. Roseze. Calyx persistent. Carpels 1 or more, free (but sometimes in- 

 cluded in the closed calyx). Genera: — 2. Spie^a • 3. DeyaSj 4. Avens ; 

 5. Kubus; 6. Steawbeeey ; 7. Potentil ; 8. Sibbaldia; 9. Alchemil; 



10. SaNGTTISOEB ; 11. POTEEIUM ; 12. AGEIMONY ; 13. EOSE. 



3. Pomaces. Calyx persistent, adherent to the ovary, the carpels of which 

 are united, at least in the ripe fruit. Genera : — 14. Pyeus ; 15. Hawthoen ; 



16. COTONEASTEE; 17. MEDLAE. 



The double-flowering Kerria japonica, so frequently to be met with trained 

 upon cottage garden-walls, formerly supposed to be a species of Corchorus, is 

 now known to belong to the Hose family. 



I. PRUNUS. PRUNITS. 



Shrubs or trees, with undivided toothed leaves, and small, free 

 stipules, often scarcely visible ; the flowers either in small bunches on 

 a former year's wood, or in racemes in the axils of young leaves. 

 Calyx free, 5-lobed. Petals 5. Stamens numerous. Ovary of 1 car- 

 pel, containing 2 pendulous ovules. Fruit a fleshy or juicy drupe, with 

 a hard stone, smooth or rugged, but not wrinkled on the surface, con- 

 taining 1, or rarely 2 seeds. 



