ARTIFICIAL KEY TO THE FAMILIES. xliii 



Flowers 4-6-merous ; if 3-merous, then leaves compound 

 or petals 5 ; sepals usually united into a lobed or 

 toothed cup : 



Filaments of the anthers united into a column or 

 cup : 



Stamens numerous, rarely few, in a column around 

 the style with only short free filaments, or dividing 

 into groups opposite the petals ; anthers 1 -celled ; 

 or if 2-celled, then the leaves compound-digitate ; 

 staminal column adnate at the base to the con- 

 torted corolla-lobes ; an epicalyx often present ; 



leaves usually simple XXVI. MALVACEAE. 



Stamens usually 15, sometimes fewer, in a column 

 or cup around the style, mouth of the column or 

 cup usually with 5 sterile prolongations opposite 

 the petals ; or if stamens more numerous, then 

 petals ; anthers 2-celled ; leaves simple ; or if 

 compound-digitate, then petals 



XXVII. STERCULIACEAE. 



Filaments of anthers free, rarely slightly connate at 

 the base in a ring or in 3-5 groups ; anthers 2-celled : 

 Leaves imparipinnate ; stamens twice as many as 

 the petals ; trees with balsaminous sap 



XXXVII. BURSERACEAE. 



Leaves simple, entire or lobed : 



Stamens usually numerous, at least twice as 

 many as and free from the petals : 



Anthers opening by slits ; petals not ciliate 

 or laciniate ; stamens borne on a torus ; fruit 

 capsular or separating into cocci 



XXVIII. TlLIACEAE. 



Anthers opening by pores or valves ; petals 

 ciliate or laciniate ; stamens inserted on the 

 disk between glands ; fruit a drupe with a 



single stone XXIX. ELAEOCARPACEAE. 



Stamens 4-5, opposite to, usually more or less 



embraced by and adnate to the base of the petals 



XLVI. RHAMNACEAE. 



Stamens epigynous or perigynous, arising from the calyx or 

 from a disk lining the calyx-tube ; or if arising from the 

 corolla, then the ovary superior and carpels more than 3 ; 

 segments of calyx always united (Calyciflorae] : 



