108 VASCULAR PLANTS. 



tate; dentations alternating in size. Petals 

 4 — 6, opposite the smaller dentations of the 

 calyx; Stamens 8 — 12. Ovary 2-locular. Cap- 

 sule 2-locular, covered by the persistent calyx. 

 . 71. flowers purple. 



ORDER XXV. ROSIFLOR^S. 



Calyx-lobes imbricate in aestivation, as many 

 as the perigynous petals. Ovaries several, in 

 different degrees of consolidation, in rare 

 instances reduced to a single one; the excen- 

 tric position of which indicates the abortion of 

 its fellows. 



Family LXXIV. Amygdalaceae. 



Calyx free, 5-cleft, deciduous. Petals 5, con- 

 volute in aestivation. Ovaries generally reduced 

 to 1, 1-locular, 2-ovulate. Fruit a drape, by 

 abortion generally 1-seeded. Leaves alternate, 

 stipulate; stipules caducous. 



1. Prunus, L- 



Drupe fleshy; endocarp not rugose. £ . 



2. Nuttallia, Torrey & Gray. 



Flowers polygamous. Ovaries 5. Fruit sev- 

 eral 1-seeded drupes. 

 b . flowers white. 



