STANDLEY TREES AND SHRUBS OF MEXICO. 33 



Ovary 1, entire. 



Leaves alternate, often lobed or compound ARALIACEAE, 



Leaves opposite or verticillate. 



Leaves estipulate CAPRIFOLIACEAE. 



Leaves stipulate, entire RUBIACEAE. 



Ovary superior or nearly superior. 

 A. Perfect stamens as many as the corolla lobes and opposite them, or more 

 numerous. 

 Ovary l-celled. 



Ovule 1. Leaves simple. 



Styles 3, or style 1 but with 3 stigmas ; flowers dioecious. Plants 



scandent MENISPERMACEAE. 



Style 1, with 5 stigmas; flowers perfect PLUMBAGINACEAE. 



Ovules 2 or more. 



Fruit a legume; leaves compound, alternate MIMOSACEAE. 



Fruit a drupe or capsule ; leaves simple. 



Plants armed with spines FOUQUIERIACEAE. 



Plants unarmed. 



Staminodia none in the staminate flowers ; seeds small, black or 



dark brown MYRSINACEAE. 



Staminodia always present ; seeds large, yellow or orange. 



THEOPHRASTACEAE. 

 Ovary perfectly, or sometimes imperfectly, 2 or more-celled. 

 Leaves stipulate (stipules sometimes minute or deciduous). 



Flowers unisexual. Ovary 3-celled EUPHORBIACEAE. 



Flowers perfect. lieaves alternate. 



Anthers 2-celled ; staminodia present STERCULIACEAE. 



Anthers l-celled ; staminodia absent. 



Leaves simple; flowers calyculate; fllaments united almost 



throughout MALVACEAE. 



Leaves digitate or simple; flowers not calyculate; filaments united 



only at the base or in the lower half BOMBACACEAE. 



Leaves estipulate. 



Flowers unisexual, rarely polygamous. Styles several, free or par- 

 tially united. 



Ovules 1 or 2 in each cell. Leaves entire DIOSPYRACEAE. 



Ovules more than 2 in each cell. 



Stamens 10 ; ovules parietal ; juice milky ; leaves compound or 



lobed CARICACEAE. 



Stamens more than 10 ; ovules axial ; juice not milky ; leaves 



simple THEACEAK 



Flowers perfect. 



Calyx segments free or united only at the base. Leaves simple. 

 Stamens more than twice as many as the corolla lobes, 9 or more. 



THEACEAE. 

 Stamens as many or twice as ma>i.v as the corolla lobes, 8 or fewer. , 



Flowers irregular. Leaves entire POLYGALACEAE, 



Flowers irregular. 



Stamens as many as the corolla lobes; juice milky. 



SAPOTACEAE. 



Stamens more numerous than the corolla lobes ; juice not 



milky ERICACEAE. 



