viii KEY TO THE OEDEES 



Gynoecium of 2 or several united carpels : stigmas or styles 2 or several- 

 Ovary, by abortion, 1-celled and 1-ovuled. 



Leaves with sheathing stipules (ocreae). Order POLYGONALES^ 



Leaves estipulate, or if stipules are present they are. not sheathing. 

 Trees or erect shrubs. 



Anthers opening by slits : ovary not seated in a hypanthium. 

 Ulmaceae in Order UBTICALES. 



Anthers opening by hinged valves : ovary seated in an. 

 accrescent hypanthium. 



Lauraceae in Order THYMELEALES. 



Woody vines. Pisoniaceae in Order CHENOPODIALES. 



Ovary several-celled, or with several placentae, several-ovuled. 



Stamens hypogynous, inserted under the gynoecium in the perfect 



flowers, not on a disk in the pistillate flowers. 

 Gynoecium 5-carpellary, the carpels nearly distinct. 



Buettneriaceae in Order MALVALES. 

 Gynoecium 2^i-carpellary, the carpels united. 

 Ovary 4-celled : fleshy maritime shrubs. 



Batidaceae in Order CHEXOPODIALJSS. 

 Ovary 2-celled : plants not fleshy. 



Oleaceae in Order OLEALES. 

 Stamens perigynous or epigynous, inserted on the margin of 



hypanthium or a disk. 



Fruit a samara. Families in Order SAFINDALES. 



Fruit not a samara. Order RHAMNALES^ 



Ovary inferior. 



Flowers not in involucre heads. 



Fruit 3-winged, splitting into 3 nutlets. Gouania in Order RHAMNALES. 

 Fruit neither 3-winged nor splitting into carpels. 

 Fruit a berry or a drupe, or nut-like. 



Calyx deciduous as a lid : stamens numerous. 



Chytraculia in Order MYBTALES. 

 Calyx of valvate or imbricated sepale : stamens few. 



Stamens as many as the perianth-members and alternate 

 with them, or fewer. 



Nyssaceae In Order AMMIALES. 

 Stamens as many as the perianth-members and opposite 



them, or twice as many. 



Ovules mostly on basal placentae, sometimes pendulous : 

 cotyledons not convolute : tree- or root-parasites. 



Order SANTALALES. 



Ovules not on basal placentae : cotyledons convolute : not 

 parasitic plants. Families in Order MYRTALES. 



Fruit a capsule. 



Calyx regular and the sepals half as many as the cavities in the 



ovary, or irregular. Order ARIST9LOCHIALES. 



Calyx regular and the sepals as many as the cavities in the 



ovary. Order MYKTALES. 



Flowers, at least the staminate, in involucrate heads. 



Ambrosiaceae in Order CAEDUALES. 

 Corolla present. 



Petals distinct, at least at the base. 



Carpels solitary, or several and distinct, or united only at the base. 

 Stamens at the base of the receptacle, i. e., hypogynous. 



Order RANALES. 

 Stamens on the margin of a hypanthium (the hypanthium very small in 



some Saxif ragaceae) . 



Plants without secreting glands in the bark. Order ROSALES. 



Plants with secreting glands in the bark. 



Surianaceae in Order GERANIALES.. 

 Carpels several and united. 

 Ovary superior. 



Stamens inserted at the base of the ovary or receptacle. 

 Stamens numerous. 

 Sepals imbricated. 



Calyx deciduous. Order PAPAVERALES. 



Calyx persistent. 



Leaves glandular or pellucid-punctate. 



Rutaceae in Order GERANIALES. 

 Leaves not glandular. 



Placentae parietal : gynoecium with a 1-celled ovary, 

 Capparidaceae in Order PAPAVERALES. 

 Placentae axile or central : gynoecium with a 2- 

 several-celled ovary, (or with distinct carpels.) 



Theaceae in Order HYPERICALES. 

 Sepals valvate. 



Stamens with distinct filaments. 



Ovary 1-celled : placentae parietal. 



Capparidaceae in Order PAPAVERALES, 



