198 



ROSACEAE. 



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. 

 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. 

 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. 

 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. 



264. AMELANCHIER, 200. 



265. 

 266. 



267. 



268. 



CRATAEGUS, 200. 

 PYRUS, 200. 



OPULASTER, 201. 



LUTKEA, 201. 



269. HOLODISCUS, 202. 



270. SPIRAEA, 202. 



271. ARUNCUS, 203. 



272. RUBUS, 203. 



273. ROSA, 204. 



274. AGRIMONIA, 205. 



275. ALCHEMILLA, 206. 



276. SANGUISORBA, 206. 



277. DRYAS, 206. 



278. GEUM, 207. 



279. SIEVERSIA, 207. 



280. POTENTILLA, 208. 



281. DASIPHORA, 210. 



282. SIBBALDIA, 210. 



