22: KEY TO THE FAMILIES. 



222. Petals and usually stamens perigynous. Leaves undivided. 223 

 Petals and stamens hypogynous. 224. 



223. Anthers opening by 1 — 2 apical pores. 



112 MELASTOMACEAE. 

 Anthers opening by 2 longitudinal slits. 107 LYTHRACEAE. 



224. Calyx with valvate aestivation. 94 TILIACEAE. 

 Calyx with imbricate or open aestivation. 22S. 



225. Disc outside the stamens. 90 MELIANTHACEAE. 

 Disc within the stamens. 75 RUTACEAE. 



226. (113) Stamens united in a tube. Anthers 1 celled. 



95 MALVACEAE. 

 Stamens free or, if united, anthers 2 celled. 227. 



227. Ovules 1 in each carpel. 228. 

 Ovules 2 or more in each carpel. 235. 



228. Styles united below or throughout. 229. 

 Styles free or loosely cohering above. 230. 



229. Leaves stipulate. Receptacle somewhat elongated. 



(Ochna) 97 OCHNACEAE. 

 Leaves exstipulate. Receptacle forming a disc. 



89 SAPINDACEAE. 



230. Leaves opposite exstipulate. 231. 

 Leaves alternate (at least the lower) or all radical. 232. 



231. Herbs usually fleshy, not climbing. (Crassula). 



60 CRASSULACEAE. 

 Shrubs usually climbing. (Clematis). 



48 RANUNCULACEAE. 



232. Leaves stipulate. 67 ROSACEAE. 

 Leaves exstipulate. 233. 



233. Flowers unisexual. Sepals 6 or more. 



49 MENISPERMACEAE, 

 Flowers hermaphrodite or, if not, then sepals 2 — 3. 234. 



234. Stem woody. Leaves entire or toothed. Sepals 2 — 3. 



50 ANONACEAE. 

 Stem herbaceous or woody below. 48 RANUNCULACEAE. 



235. (227) Leaves stipulate. 236. 

 Leaves exstipulate. 237. 



236. Petals and stamens perigynous. 67 ROSACEAE. 

 Petals and stamens hypogynous. 96 STERCULIACEAE. 



237. Sepals 2 — 3. Petals 3 — 6. Stamens 6 — many. 



50 ANONACEAE. 

 Sepals 4 or more, or if 3 then stamens 3. 238. 



238. Stem herbaceous. Ovules usually numerous. 



60 CRASSULACEAE. 

 Stem woody throughout. Ovules 2. 239. 



239. Stamens 10. Climber. (Cnestu). 68 CONNARACEAE. 

 Stamens 3—5. Trees. (Fagara). 75 RUTACEAE. 



