2 NORTH AMERICAN FLORA [Volume 25 



Anthers united over the top of the gynoecium ; carpels 

 several-ovuled. Fam. 6. Balsaminaceae. 



Calyx regular, none of the sepals spurred or saccate. 



Style basal, arising from between the nearly distinct 



carpel-bodies. Fam. 7. Limnanth.ui.ak 



Style not basal, the carpel-bodies well united. 



Shrub or tree with almost leafless branches ; (lower- 

 clusters borne on thorn-like twigs. Fam. 8. Koeberliniaceae. 

 Herbs, shrubs, trees or vines, with simple or com- 

 pound leaves. 

 Herbs, shrubs or trees with conspicuously or 

 loosely articulated stems, and opposite or alter- 

 nate mostly compound leaves, the flower-stalks 

 arising from the axils of the interpetiolar 

 stipules when the leaves are opposite; calyx 

 without glands ; anthers with inconspicuous 

 connectives ; filaments usually with a scale at 

 the base; gynoecium mostly 4-12-carpellary, and 

 with united styles and 2-several ovules, or 

 rarelv a single ovule in each carpel ; embryo 



straight or nearly so. Fam. 9. Zygophyllaceae. 



Shrubs, treesorwoodv vines with inconspicuously 

 jointed stems and opposite simple leaves ; calyx 

 commonly with a gland or a pair of glands on 

 the back" of each sepal ; anthers mostly with 

 conspicuous connectives ; filaments without 

 scales at the base ; gynoecium mostly 3-carpel- 

 lary and with distinct styles and a single ovule 

 in each carpel ; embryo usually abruptly bent 



or coiled. Fam. 10. Malpighiaceae. 



Plants with secreting glands or cells which are often in the 

 leaves, or only in the bark. 

 Filaments distinct, nearlv or quite to the base. 



Leaves punctate by oil glands. Fam. 11. Rutaceae. 



Leaves not punctate. 



Gynoecium of distinct carpels. Fam. 12. Surianaceae. 



Gynoecium of more or less united carpels. 



Bitter-barked shrubs or trees with oil-sacs in the 



bark Fam. 13. Suiarubaceae. 



Resiniferous shrubs or trees. Fam. 14. Burseraceae. 



Filaments united into a cup or tube, wholly or in part. Fam. 15. Meliaceae. 



Corolla with one petal spurred. Fam. 16. Trigo.n-iaceae. 



