XIV KEY TO THE ORDERS. 



Flowers monoecious. 



Euphorbiaceae in Order EUPHORBIALES. 



Flowers perfect. Portulacaceae in Order CHENOPODIALES. 



Stamens as many as the petals and alternate with them, or 



more, sometimes twice as many. 

 Stamens 6 : petals 4 : sepals 2 or 4. 



Families in Order PAPAVERALES. 

 Stamens, petals and sepals of the same number, or stamens 



more, usually twice as many as the sepals or petals. 

 Ovary 1-celled. 



Ovules, or seeds, on basal or central placentae. 



Families in Order CHENOPODIALES. 

 Ovules, or seeds, on parietal placentae. 

 Stigmas 2-cleft. 



Droseraceae in Order SARRACENIALES. 

 Stigmas entire. 



Stamens with united filaments and no stami- 

 nodia. Families in Order MALVALES. 



Stamens with distinct filaments. 



Families in Order HYPERICALES. 

 Ovary several-^Hed. 



Stamens adnate to the gynoecium. 



Asclepiadaceae in Order ASCLEPIADALES. 

 Stamens not adnate to the gynoecium. 



Stamens with wholly or partly united filaments. 

 Anthers opening lengthwise. 



Families in Order GERANIALES. 

 Anthers opening by pores. 



Polygalaceae in Order POLYGALALES. 

 Stamens with distinct filaments. 

 Anthers opening by pores. 



Families in Order ERICALES. 

 Anthers opening by slits. 



Stigmas or styles distinct and cleft, or foli- 

 aceous, or united by pairs. 



Order EDPHORBIALES. 

 Stigmas or styles all distinct or all united, 



neither cleft nor foliaceous. 

 Stamens 2. Oleaceae in Order OLEALES. 

 Stamens more than 2. 



Leaves with compound blades. 



Families in Order GERANIALES. 

 Leaves with simple blades. 



Ovule solitary in each carpel. 

 Styles distinct : ovule pendu- 

 lous. 



Families in Order GERANIALES. 

 Styles united : ovule erect or 



ascending. 



Limnanthaceae in Order SAPINDALES. 

 Ovules 2 or more in each carpel. 

 Flowers irregular : stamens 

 united at the top or 

 converging. 

 Placentae axile. 

 Balsaminaceae in Order GERANIALES. 



Placentae parietal. 

 Violaceae in Order HYPERICALES. 

 Flowers regular : stamens 

 neither united nor con- 

 verging at the top. 

 Carpels not circumscissile 



at maturity. 

 Placentae parietal. 

 Cistaceae in Order HYPERICALES. 

 Placentae axile or cen- 

 tral. 



Tiliaceae in Order MALVALES. 

 Carpels circumscissile at 



maturity. 



Penthoraceae in Order ROSALES. 

 tt Stamens inserted on the margin of a disk or hypanthium (perigynous 



or hypogynous). 

 Stamens as many as the petals and opposite them. 



Styles and upper part of the ovaries distinct : ovules and seeds 



many. Saxifragaceae in Order ROSALES. 



Styles united. Order RHAMNALES. 



