STAXDLEY TREES AXD SHEUBS OF MEXICO. 29 



Stamens 4 or 5. Leaves simple, entire or tlentate. 



Calyx valvate in bud; stamens opposite the petals and often ad- 

 nate to them BHAMNACEAE. 



Calyx imbricate; stamens alternate or opposite, but very rarely 



adnate to the petals CELASTRACEAE. 



Stamens hypogynous. 

 Flowers unisexual. 



Ovary 4 to 6-parted ; leaves usually pinnate, alternate, estipulate. 



SIMAROUBACEAE. 

 Ovary entire or slightly lobed ; leaves simple or digitate. 

 Ovules i>endulous or descending : rtvary usually 3-celled. 

 Cells of the ovary 3 ; fruit usually a capsule. 



ETJPHORBIACEAE. 

 Cells of the ovary 4 or more: fruit a drupe. 



AQTJIFGLIACEAE. 

 Ovules ascending; ovary usually 4 or 5-celled. Fruit drupaceous. 



CLUSIACEAE. 

 Flowers perfect or polygamous. 

 Flowers polygamous. 



Leaves opposite or verticillate. entire. Stamens numerous. 



CLUSLACEAE. 

 Leaves alternate, usually compound. 



Stamens inserted within a disk ; ovules ascending or horizon- 

 tal ; radicle inferior SAPINDACEAE. 



Stamens inserted outside a disk ; ovules pendulous or horizon- 

 tal ; radicle superior. Leaves pinnate. 

 Ovary entire or slightly lobed ; styles several and distinct, or 



stigma 1 and sessile ANACABDIACEAE. 



Ovary deeply divided; styles connate. _SIMABOTJBACEAE. 

 Flowers perfect. 



Stamens more than 10. Leaves stipulate, simple. 



Sepals valvate or open in bud, more or less united ; anthers 



1-celled MALVACEAE. 



Sepals imbricate, free or nearly so ; anthers 2-celled. Flowers 



yellow OCHNACEAE. 



Stamens 10 or fewer. 

 Leaves simple and entire, toothed, or lobed. 



Stamens 8 ; ovary 2-celled. Leaves entire : flowers racemose. 



POLYGALACEAE. 

 Stamens 2 to 6, or 10 ; ovary 3 to 6-celled. 

 Ovary 5 or 6-celled. Leaves alternate, stipulate : petals 



imbricate, yellow OCHNACEAE. 



Ovary 2 to 4-celled. Leaves entire ; plants often scandent. 



MALPIGHIACEAE. 

 Leaves compound. 



Filaments united. Leaves pinnate ; ovary entire. 



MELIACEAE. 

 Filaments free. 

 Leaves gland-dotted ; filaments without scales ; ovary 



entire RUTACEAE. 



Leaves not gland-dotted; filaments usually with a basal 

 scale ; ovary usuallv divided SniABOUBACEAt. 



