106 



FOUNDATIONS OF BOTANY 



A. 



Ripe carpels not enclosed within the calyx-tube. 



1. Fruit dry. 



(a) Carpels 1-5, inflated. Physocarpus, I- 



{h) Pods 5-8, not inflated. Spirsea, IT. 



(f) Akenes 2-6, styles not lengthening after flowering. 



Waldsteinia, VIII. 



(d) Akenes many, on a dry receptacle. Styles not length- 



ening. Potentilla, X. 



(e) Akenes many, on a dry receptacle. Styles lengthening 



after flowering, forming tails to the akenes. 



Geum., XI. 



2. Fruit fleshy. 



(a) Akenes several-many, becoming little stone-fruits. 



Rubus, VII. 



(b) Akenes many, dry on ripening, on a fleshy, eatable 



receptacle. Fragaria, IX. 



(c) Pistil solitary, becoming a stone-fruit. Prunus, XIII. 



. jO 



A B 



Fig. 13. — Pistils in the Rose Family. 

 A, Prunus-type ; B, Potentilla-type ; C, Rosa-type, c, calyx, o, ovary. 



B. 



Ripe carpels enclosed within the calyx-tube. 

 1. Fruit a pome. 



(a) Carpels more than 2-seeded ; seeds covered with a muci- 

 laginous pulp. Fruit 5-celled. Cydonia, III. 



