58 Rosaceae 



Subfamily Pomoideae, Stipules distinct. Carpels 

 5-2, united with the inner wall of the hollow flower-axis, 

 usually syncarpous (i.e. united to each other). False 

 fruit formed of carpels + axis + lower part of calyx. 



A. Carpels free on their ventral sides (i.e. the sides 

 to which the styles are attached). 



Fruit a drupe with 3-5 partially exserted stones. 



Cotoneaster. 



B. Carpels united. 



Inner wall of carpel cartilaginous when ripe. Pirus. 

 Inner wall of ripe carpel hard, fruit hence a drupe. 

 Leaves lobed. Flowers in corymbose cymes. 



Crataegus. 

 Leaves undivided. Flowers solitary. *Mespilus. 



Subfamily Rosoideae. Carpels either 00 , on conical 

 gynophore, rarely few not enclosed in axis, or i-oo 

 enclosed in persistent flower-axis : each carpel with 1-2 

 ovules. Fruit always indehiscent. 



Tribe I. Potentilleae. Flower-axis fiat Stamens co , 

 narrowed upwards from broad base. Carpels mostly co , 

 on convex gynophore. 



No epicalyx. Carpels each with two ovules. Fruit 

 drupaceous. Rubus. 



Epicalyx present. Carpels with one ovule. Fruit dry, 

 indehiscent. Style not persistent. Achenes on large 

 fleshy receptacle. Fragaria. 



As Fragaria but achenes on small dry receptacle. 



Potentilla. 



Epicalyx. Fruit indehiscent with persistent style. 



Leaves simple. Scape i -flowered. Petals 8-9. 



Dry as. 



