ROSACEiB 



61 



plants furnishing many of our most valuable fruits and flowers. 

 Closely resembling the Saxifragaoeae in the flower, and the Legumi- 

 nosiB in the leaf. 



* Ovary neither adhering to the calyx tude, nor surrounded by, 

 noe enclosed in it. 



1. Pninus, pistil solitary, beroming a drupe. 



2. Spirea, pistils 5-8, forming several-seeded follicles. 



3. Geum, pistils numerous, on a dry receptacle forming dry aohenes 'with 

 styles elongating at maturity. 



4. Dryas, same as preceding, but shrubby. 



5. Potentilla, pistils numerous on a dry receptacle forming aohenes, but 

 the styles not elongating at maturity. 



6. Fragaria, pistils numerous in pits on the surface of a fleshy receptacle. 



7. Chamsrhodus, pistils S-20 on a dry receptacle. 



8. Rubus, pistils numerous as drupelets on a fleshy receptacle. 



** Ovary enclosed in the calyx tube, but not adhering to it. 



9. Agrimonia, pistils 2, enclosed in a dry calyx tube armed with hooked 

 prickles around the top. 



10. Rosea, pistils, many, enclosed in an urn-shaped fleshy calyx tube. 



*** Ovary adhering to the calyx tube to form a fleshy fruit. 



11. Pyrus, fruit a large fleshy pome. 



12. Crattegus, fruit a small drupe-like pome with 1-5 bony kernels. 



13. Amelanchier, fruit a small and berry-like pome with 10 hard seeds. 



1. PRUNUS. Plum, Cherry. 



Calyx 5-cleft; petals 5, separate, spreading; stamens 15-20;. 



pistil solitary; fruit a fleshy drupe. Small trees or shrubs with 



white flowers and edible fruit. 



St- 



1. P. i\igra. Ait. Wild Plum. 



A short or small tree armed 

 with thorns; leaves thin, ovate, 

 doubly crenate or serrate, usually 

 glandular at the points of the teeth; 

 fruit yellowish red, somewhat ob- 

 long. Thickets, Man. west not 

 far past meridian 100. 



P. Virginians, 

 Cherry. 



Choke 



Fio. 46. — Section of Flower of Prunus. 



St. stigma ; s. style ; sta. stamens ; se. sepal ; 

 p. petal ; o, ovary. 



A tall shrub with grayish brown bark; leaves oval, oblong, or obovate, 

 blunt, sharply serrate or double serrate; flowers on short pedicels in axillary 



