STANDLEY — TREES AND SHRUBS OF MEXICO. 23 



Stamens numerous. 



Ovary borne on a long gynophore; seeds without endosperm. 



CAPPARIDACEAE. 

 Ovary sessile or nearly so ; seeds with endosperm. 



FLACOURTIACEAE. 

 AA. Ovary 1, several-celled, or the carpels several and distinct. 

 Ovaries several, distinct. 



Stamens with connate filaments, hypogynous. Leaves alternate, 



stipulate STERCULIACEAE. 



Stamens with distinct filaments, or the filaments wanting, the stamens 

 in the latter case perigynous. 

 Perianth segments distinct ; leaves opposite, compound ; plants 



scandent RANUNCULACEAE. 



Perianth segments of the perfect and pistillate flowers more or less 

 united, those of the staminate flowers sometimes distinct but the 

 plants then with alternate leaves; plants erect. 



Ovules 2; leaves stipulate, pinnate SIMAROUBACEAE, 



Ovule 1 ; leaves estipulate, simple MONIMIACEAE. 



Ovary 1. 



Ovule 1 in each cell. 



Flowers perfect RHAMNACEAE. 



yiowers polygamous or dioecious. 



Leaves compound, estipulate; stamens 8 SAPINDACEAE. 



Leaves simple, stipulate ; stamens 4 or 5, or 10 to 20. 



Stamens 4 or 5 J RHAMNACEAE. 



Stamens 10 to 20 BUXACEAE. 



Ovules 2 or more in each cell. 

 Ovules 2 in each cell. 

 Leaves stipulate. 



Style 1, undivided ; ovary 5-lobate. Leaves alternate. 



STERCULIACEAE. 



Styles several ; ovary usually 3-lobate EUPHORBIACEAE. 



•Leaves estipulate. 



Flowers perfect ; seeds without endosperm ACERACEAE. 



Flowers unisexual ; seeds with endosperm BUXACEAE. 



Ovules 3 or more in each cell. 



Stamens 15 or fewer TILIACEAE. 



Stamens very numerous ELAEOCARPACEAE. 



Ovary inferior, almost inferior, or half inferior. 

 Ovary 1-celled, or sometimes incompletely several-celled. 

 Ovule 1. 



Stamens as many as the perianth segments and alternate with them; 

 perianth corolla-like. Flowers in involuerate heads. 



ASTERACEAE. 

 Stamens as many as the perianth segments and opposite them, or fewer 

 or more numerous; perianth calyx-like or wanting. 

 Leaves stipulate. 



Leaves opposite " CHLORANTHACEAE. 



Leaves alternate MORACEAE. 



Leaves estipulate. 

 Leaves pinnate. Plants trees or shrubs; flowers in catkins. 



JUGLANDACEAE. 

 Leaves simple, sometimes reduced to scales. 

 Plants trees; fruit winged HERNANDIACEAE. 



