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. Crataegus, 200. 



266. Pyrus, 200. 



267. Opulaster, 201. 



268. 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. 



