NORTH AMERICAN FLORA 



[Volume 22 



Capsule thin -walled, almost free from the hy- 

 panthium. 



Stamens 5: hypanthium flattish, not accres- 

 cent: leaves without stipules. Fam. 



Stamens numerous: hypanthium hemi- 

 spheric, inflated in age : leaves with 



stipules. ' Opulaster in Fam, 



Capsule woody or thick-walled, manifestly ad- 

 nate to the hypanthium. 

 Styles united. 

 Styles distinct. 



Calyx or calyx and corolla present: ovule 



solitary in each carpel, suspended. 

 Calyx and corolla wanting: ovules several 

 or numerous in each carpel, horizontal. 

 Fruit a 1-celled berry. 



Hypanthium not produced beyond the top of 

 the ovary ; flower- clusters borne on the leaf- 

 blades. 

 Hypanthium produced beyond the top of the 

 ovary ; flowers axillary. 

 Endosperm wanting or scant: stipules mostly present. 

 Flowers monoecious, in dense capitate clusters. 

 Flowers perfect, or if monoecious or dioecious, not in 

 capitate clusters. 

 Seed with a fimbriate or rugose aril^ 



Carpels bearing several' or many ovules; leaves 



with simple blades. 

 Carpels bearing 1 or 2 ovules: leaves with com- 

 pound blades. 

 Seed without an aril. 



Carpels several or numerous, or if solitary becoming 

 an achene. 



Carpels -distinct, rarely adnate to the hypan- 

 thium: fruit achenes, follicles or drupelets. 

 Sepals and petals numerous: leaves opposite. Fam. 

 Sepals and petals 5 or fewer, or petals rarely 

 wanting : leaves mostly alternate. 

 Carpels united, enclosed by the hypanthium and 

 adnate to it: fruit a pome. 

 Carpel solitary, not becoming an achene. 



Ovai^ bearing 2 ovules : leaf -blades simple: 



fruit a drupe. 

 Ovary bearing several ovules: leaf -blades 2-3- 

 pinnate: fruit a legume. 

 Petals valvate in the bud. 



8. ITEACEAE. 



18. ROSACEAE. 



Fam. 9. Pterostemonaceae 



Fam. 10. Hamamelidaceae 

 Fam. 11. Altingiaceae. 



Fam. 12. Phyllonomaceae. 

 Fam. 13. Grossulariaceae. 

 Fam. 14. Platanaceae. 



Fam. 15. Crossosomataceae 

 Fam. 16. Connaraceae. 



17. Calycanthaceae 



Fam. 18. Rosaceae. 

 Fam. 19. Malaceae. 



Fam. 20. Amygdalaceae. 



Fam. 21. 

 Genera in Fam. 23. 



MiMOSACEAE. 



C AESALPINI ACE AE 



Petals imbricate in the bud. 

 Flowers irregular (mainly zygomorphic). • 



Upper petal enclosed by the lateral ones in the bud: 

 corolla not papilionaceous. 

 Fruit indehiscent, armed with barbed spines: leaf -blades 



simple: stipules wanting. Fam. 22. Krameriaceae. 



Fruit a legume or loment: leaf -blades compound: stipules 

 usually present. Fam. 23. Caesalpiniaceae 



Upper petal enclosing the lateral ones in the bud: corolla 

 papilionaceous. Fam. 24. Fabaceae. 



