I 9 8 



ROSACEAE. 



265. 

 266. 



267. 



270. 



Pistils more than one. 



Pistils 2-5, united with each other and with the 

 lower part of the receptacle and calyx-tube 

 with which in fruit they form a pome. 

 Flowers in racemes; locules of mature 



pomes 10. 



Flowers in corymbs or cymes; locules 1-5. 

 Carpels stony in fruit. 

 Carpels papery in fruit. 

 Pistils few or many, free. 



Fruit of few 2-several-seeded follicles. 

 Leaves palmately-lobed. 

 Leaves not palmately-lobed. 



Stamens united at base; flowers in 



racemes. 268. 



Stamens not united at base; flowers 



in panicles or corymbs. 

 Stamineal disk adherent, entire; 



ovules 2. 



Stamineal disk free at the edge, 



not entire; ovules 5 or more. 



Shrubs with simple leaves; 



flowers perfect. 

 Herbs with compound leaves; 



flowers dioecious. 271. 



Fruit of numerous 1-2-seeded akenes or 



drupelets. 



Fruit of drupelets, usually united. 

 Fruit of akenes. 



Receptacle urn-shaped or bell-shaped, 



enclosing the akenes. 

 Receptacle fleshy; akenes num- 

 erous. 

 Receptacle dry; akenes 1-4. 



Petals 5, yellow; calyx prickly. 

 Petals none; calyx not prickly. 

 Leaves palmately-lobed ; 



flowers axillary. 

 Leaves pinnately-lobed ; 



flowers in a spike. 

 Receptacle convex, flat or but slightly 



concave. 

 Styles persistent, mostly plumose 



or geniculate. 



Calyx-lobes and petals 8 or 9. 

 Calyx-lobes and petals 5. 



Styles jointed, the upper 

 part deciduous. 



264. AMELANCHIER, 200. 



CRATAEGUS, 200. 

 PYRUS, 200. 



OPULASTER, 201. 

 LUTKEA, 201. 



269. HOLODISCUS, 202. 



SPIRAEA, 202. 

 ARUNCUS, 203. 



272. RUBUS, 203. 



273. 

 274. 



275. 

 276. 



ROSA, 204. 

 AGRIMONIA, 205. 



ALCHEMILLA, 206. 

 SANGUISORBA, 206. 



277. DRYAS, 206. 



Styles not jointed, plu- 

 mose or naked. 

 Styles deciduous, naked. 

 Styles terminal. 

 Styles lateral. 



Shrubs; carpels hairy. 

 Herbs; carpels glabrous. 

 Stamens 5; carpels 10- 

 15. 



278. 

 279. 

 280. 

 281. 



GEUM, 207. 

 SIEVERSIA, 207. 

 POTENTILLA, 208. 

 DASIPHORA, 210. 



282. SIBBALDIA, 210. 



