114 KEY AND FLORA 
(c) Carpels 5-15 (usually 10), 1-seeded. Filipendula, X 
(d) Akenes 2-6, styles not lengthening after flowering. 
Waldsteinia, VIII 
(e) Akenes many, on a dry receptacle. Styles not length- 
ening. Potentilla, IX 
(f) 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 drupes. 
Rubus, XIT 
(0) Akenes many, dry on ripening, on a fleshy, eatable 
receptacle. Fragaria, VII 
(c) Pistil solitary, becoming a drupe Prunus, XIV 
Fic. 19. Pistils in the Rose Family 
A, Prunus-type; B, Potentilla-type; C, Rosa-type. c, calyx; 0, ovary 
B 
Ripe carpels inclosed 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 
(5) Carpels 2-seeded (except in some cultivated varieties) ; 
seeds without pulp. Fruit 5-celled. Pyrus, IV 
(c) Carpels 2-seeded; fruit 10-celled. Amelanchier, V 
