306 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Styles lateral; ovules ascending, 
amphitropous. 
Achenes hairy; shrubs........ 10. DastpHorA (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. Grum (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. Faiuaeta (p. 317). 
Hypanthium bractless; achenes 
1 to 5. 
Hypanthium flat, saucer- 
shaped, or hemispheric; 
flowers in a large panicle; 
(carpels 5).........-2---- 5. SERICOTHECA (p. 310). 
Hypanthium funnelform or 
tubular; flowers mostly 
solitary. 
Petals wanting; hypanthium 
long-tubular; calyx de- 
ciduous from the hy- 
panthium..............17. Cercocarpus (p. 318). 
Petals 5; hypanthium tur- 
binate; calyx persistent. 
Carpels about 5; achenes 
tails......2..2.....-- 15, CowANnIa (p. 318). 
Carpels 1; achene not plu- 
mose-tailed..........- 16. Pursuta (p. 318). 
1. ROSA L. Roskz. 
More or less spiny shrubs, 2 meters high or less, with mostly slender branches and 
odd-pinnate, 3 to 7-foliolate leaves; stipules conspicuous, adnate to the petioles; 
flowers solitary or in few-flowered corymbs terminating the branches, large and showy, 
3 to 6 cm. in diameter, pink or rose purple, fading lighter; hypanthium spherical or 
