KEY TO THE OKDEKS xi 



Styles united : ovule erect or ascending. 



Limnanthaceae in Order SAPINDALES. 723 

 Ovules 2 or more in each carpel. 



Flowers irregular : stamens united at the top or con- 

 verging. 

 Placentae axile. 



Balsaminaceae in Order GERANIALES. 658 

 Placentae parietal. 



Violaceae in Order HYPERICALES. 781 

 Flowers regular: stamens neither united nor con- 

 verging at the top. 



Carpels not circumscissile at maturity. 

 Placentae parietal. 



Cistaceae in Order HYPERICALES. 781 

 Placentae axile or central. 

 Styles distinct. 



Elatinaceae in Order HYPERICALES. 781 

 Styles united. 



Ovary sessile : filaments filiform. 



Tiliaceae in Order MALVALES. 759 

 Ovary stipitate : filaments fusiform. 



Koeberliniaceae in Order GERANIALES. 658 

 Carpelscircumscissile at maturity. 



Penthoraceae in Order ROSALES. 494 



t| Stamens inserted on the margin of a disk or hypanthium (perigynous or hypogynous). 

 Stamens fewer than the sepals or the petals. 



Hippocrateaceae in Order SAPINDALES. 723 

 Stamens as many as the sepals or the petals, or more. 

 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. 494 

 Styles united. 



Ovules and seeds numerous. Moringaceae in Order PAPAVERALES. 459 



Ovules and seeds solitary or 2. Order RHAMNALES. 747 



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

 Styles distinct. 



Upper part of the ovaries distinct, at least at maturity. 



Saxifragaceae and Iteaceae in Order ROSALES. 494 



Upper part of the ovaries united. Order SAPINDALES. 723 



Styles united. 



Hypanthium flat or obsolete : disk fleshy. 



Plants without secreting glands in the bark. Order SAPINDALES. 723 



Plants with secreting glands in the bark. Families in Order GERANIALES. 658 

 Hypanthium cup-shaped or campanulate : disk obsolete or inconspicuous 



Order MYRTALES. 822 

 ft Ovary inferior. 



Stamens numerous. 



Styles and stigmas united into a disk : water-plants with endogenous stems. 



Nymphaeaceae in Order ROSALES. 494 

 Styles distinct, or united, but not forming a disk with radiating stigmas : land-plants 



with exogenous stems. 

 Styles distinct. 



Stamens distinct : stigmas simple : shrubs or trees. Families in Order ROSALES. 494 

 Stamens with united filaments : styles branched : herbs. Order BEGONIALES. 817 

 Styles united. 



Shrubs or trees ; not succulents, sometimes woody vines. 

 Hypanthium not produced beyond the ovary. 



Escalloniaceae in Order ROSALES. 494 



Hypanthium produced beyond the ovary. Families in Order MYRTALES. 822 

 Herbs, or shrub-like or tree-like succulents. Order OPUNTIALES. 808 



Stamens not more than twice as many as the petals. 



Styles wanting : stigmas sessile. Gunneraceae in Order MYRTALES. 822 



Styles present. 

 Styles distinct. 



Ovules several in each cavity of the ovary : fruit a capsule or a fleshy many- 

 seeded berry. 



Fruit, if dehiscent, valvate. Families in Order ROSALES. 494 



Fruit circumscissile. Portulacaceae in Order CHENOPODIALES. 383 



Ovules solitary in each cavity of the ovary : fruit a drupe or 2-5 more or less 



united achenes. Order AMMIALES. 851 



Styles united, or single. 

 Plants without tendrils. 



Ovary enclosed in or surpassed by the hypanthium or adnate to it. 



Anther-sacs opening by pores. Vacciniaceae in Order ERICALES. 876 



Anther-sacs opening by slits. 



Ovules solitarv in each cavity of the ovary. Order AMMIALES. 851 



Ovules several in each cavity. 



Ovary with parietal placentae. Loasaceae in Order OPUNTIALES. 808 

 Ovary with central or basal placentae. 



Families in Order MYRTALES. 822 

 Ovary exceeding the hypanthium, the top free. 



Escalloniaceae in Order ROSALES. 494 

 Plants with tendrils. 



Herbs : fruit a pepo : leaf-blades palmately veined. 



Cucurbitaceae in Order CAMPANULALES. 1134 

 Shrubby vines : fruit drupaceous, separating into nutlets : leaf-blades pin- 



nately veined. Rhamnaceae in Order RHAMNALES. 747 



