436 FLORA OF MADRAS. [Rosaceae. 



rarely 0. Flowers usually regular and hermaphrodite. Calyx- 

 tube free or adnate to the ovary, usually 5-lobed, often bracteolate. 

 Disk lining the calyx-tube or forming a ring at its base. Petcds 

 5, rarely 0, inserted under the margin of the disk, usually 

 imbricate. Stamens perigynous, usually indefinite, in one or 

 more series ; filaments generally incurved in bud ; anthers small, 

 didymous. Ovary of one or more free or connate carpels ; ovules 

 1 or more in each carpel ; styles basal lateral or subterminal, 

 free or connate ; stigmas simple, peiiicillate or capitate. Fruit 

 variable, of achenes berries or drupes, rarely capsular. Seeds erect 

 or pendulous, exalbuminous ; testa membranous or coriaceous ; 

 cotyledons plano-convex ; radicle short. 



Ovary superior ; the ripe carpels not enclosed in the calyx- tube : 

 Flowers irregular ; ovules 2, ascending ; carpel 1, style basal 



1. Parinarium. 



Flowers regular ; ovules 2, pendulous : 



Carpel 1 : 



Drupe erect ; style terminal : 



Petals large ; endocarp hard, bony Prunus. 



Petals very small; endocarp coriaceous 2. Pygeum. 



Drupe inverted ; style subbasal ; endocarp coriaceous 



Prinsepia. 



Carpels many : 



Ovules 2 ; pendulous ; calyx ebracteolate ; prickly shrubs : 



3. Rubus. 

 Ovule 1, erect ; calyx bracteolate ; herbaceous plants : 



Achenes on a fleshy receptacle 4. Fragaria. 



Achenes on a dry receptacle 5. Potentilla. 



Ovary inferior ; the ripe carpels enclosed in the calyx-tube : 



Carpel 1; petals 0; herbaceous 6. Alchemilla. 



Carpels more than 1 ; petals present ; trees or shrubs : 



Carpels not confluent when ripe ; prickly shrubs with compound 



leaves and adnate stipules 7. Rosa. 



Carpels confluent when ripe ; erect unarmed trees or shrubs with 

 simple leaves and small stipules : 



Flowers in panicles ; ovary 5-celled Eriobotrya. 



Flow r ers corymbose or fascicled : 



Ovary 5-celled ; endocarp cartilaginous Pyrus. 



Ovary 2-3-celled ; endocarp thin ; evergreen trees 



8. Photinia. 

 Ovary 2-5-celled ; endocarp bony ; rigid shrubs 



9. Cotoiieaster. 



