354 THE KINDS OF PLANTS 



rosaceous plants are rose, strawberry, apple, pear, plum, peach, 

 cherry, blackberry, raspberry, spirea, cinquefoil. 



A. Herbs. 



B. Torus not enlarging. 



c. Carpels many, in a head. 



D. Style deciduous 1. Potentilla 



DD. Style persistent on akene, usually jointed and 



plumose 2. Geum 



cc. Carpels 2: calyx prickly and lobes closing over 



the fruit : 1 or 2 akenes 3. Agrimonia 



BB. Torus becoming fleshy: flowers directly from the 



crown or root 4. Fragaria 



AA. Shrubs or trees. 



B. The ovary 1, superior: fruit a drupe 5. Prunus 



BB. The ovaries more than 1. 



0. Fruit 1-seeded drupes aggregated, or akenes. 

 D. Ovaries many, free from calyx and torus, be- 

 coming drupelets (i. Bitbiis 



DD. Ovaries 5-8: shrubs not prickly: leaves sim- 

 ple : flowers yellow : fruit akenes 7. Kerria 



cc. Fruit akenes inside a hollow torus 8. Rosa 



ccc. Fruit a pome: ovaries usually 5, immersed in the 

 torus. 

 D. Petals oblong-spatulate: carpels 3-5-eelled, but 



appearing about 10-celled 9. Amelanchier 



DD. Petals rounded: ovaries 5. 



E. Pome with 2-seeded carpels 10. Pyrus 



EE. Pome with many-seeded carpels 11. Cydonia 



EEE. Pome with 1-5 stony kernels 12. Cratitgus 



cccc. Fruit 2-8 dry follicles, each several-seeded IH. Spircea 



1. POTENTlLLA. Five Finger. Cinquefoil, 



Herbs (sometimes shrubby) with flat deeply 5-cleft calj'x and 5 bracts 

 beneath it, and 5 obtuse, mostly yellow or white petals: stamens many: fruit 

 an akene, of which there are many in a little head on the small, dry torus: 

 leaves compound. 



P. Norv6gica, Linn. An erect (1-2 ft. tall) very hairy and coarse annual, 

 with 3 obovate, or oblong serrate leaflets and small flowers in which the yel- 

 low corolla is usually not so large as the calyx. Common weed. 



P. Canad6ii8i8, Linn. Common five-finger. Trailing, strawberry - like, 

 with five narrow leaflets, but the lateral ones deeply lobed: flowers solitary, 

 on axillary peduncles, bright yellow. Fields: common. 



P. arg^ntea, Linn. Perennial, with stem prostrate, branching above, 

 white- woolly: leaflets 5, wedge -oblong, green above, white - pubescent 

 beneath, with a few large, incised teeth, and margins revolute: flowers 

 small, cymose, yellow: stamens about 20. June to September, in dry soil. 



