306 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Styles lateral; ovules ascending, 

 amphitropous. 



Achenes hairy; shrubs 10. Dasiphora (p. 316). 



Achenes glabrous; herbs. 

 Achenes 10 to 15; stamens 5. 

 (Leaves trifoliolate; pet- 

 als yellow.) 9. Sibbaldia (p. 315). 



Achenes numerous; stamens 

 about 20. 

 Receptacles not enlarged 

 in fruit; leaves pin- 

 nate; petals yellow. . 7. Argentina (p. 314). 

 Receptacles fleshy, much 

 enlarged in fruit, red; 

 leaves trifoliolate; pet- 

 als white 8. Fragaria (p. 315). 



Styles not articulated to the ovary; shrubs, 

 except Geum and Sieversia. 

 Styles geniculate above, the upper por- 

 tion deciduous, the basal portion 



forming a hook 13. Geum (p. 317). 



Styles not geniculate, wholly persist- 

 ent. 

 Herbs with woody rootstocks and 



pinnate leaves 12. Sieversia (p. 316). 



Shrubs with simple, at most only' 

 deeply lobed, leaves. 

 Hypanthium bearing bracts; 



achenes numerous 14. Fallugia (p. 317). 



Hypanthium bractless; achenes 

 lto5. 

 Hypanthium flat, saucer- 

 shaped, or hemispheric; 

 flowers in a large panicle; 



(carpels 5) 5. Seeicotheca (p. 310). 



Hypanthium funnelform or 

 tubular; flowers, mostly 

 solitary. 

 Petals wanting; hypanthium 

 long-tubular; < alyx de- 

 ciduous from the hy- 

 panthium 17. Cercocarpus (p. 318). 



Petals 5; hypanthium tin-- 



binate; calyx persistent. 

 Carpels about 5; achenes 

 with long plumose 



tails 15. ( 'owANiA (p. 318). 



Carpels 1; achene not plu- 

 mose-tailed 16. Purshia (p. 318). 



1. ROSA L. Rose. 



More or less spiny shrubs, 2 meters high or less, with mostly slender branches and 

 odd-pinnate, 3 to 7-foliolafe leaves; stipules conspicuous, adnate to the petioles; 

 flowers solitary or in few-flowered corymbs terminating the brauches, large and showy, 

 3 to 6 cm. in diameter, pink or rose purple, fading lighter; hypanthiuni spherical or 



