i KEY TO THE OBDEES 



Leaves not appressed scales : stems or branches not loosely jointed. 

 Fruit 1-seeded: seeds without tufts of hairs. 



Pistillate flowers without a calyx : ovule erect and orthotropous. 



Order MTRICALES. 



Pistillate flowers with a calyx : ovule pendulous and anatropous. 

 Leaf-blades simple. Oleaceae in Order OLEALES. 



Leaf-blades compound : fruit a samara. 



Oleaceae in Order OLEALES. 



Fruit many-seeded : seeds each with a tuft of hairs. Order SALICALES. 

 Calyx present at least in the staminate or in the perfect flowers. 



Leaves represented by appressed whorled scales : branches loosely Jointed. 



Order CASUARIXALES. 

 Leaves not appressed scales : branches not loosely jointed. 



Flowers, at least the staminate, in aments, or ament-like spikes. 



Pistillate flowers separate at maturity : fruit a nut or an achene. 



Order FAGALES. 

 Pistillate flowers forming aggregate fruits : fruit drupe-like. 



Artocarpaceae in Order UBTICALES. 

 Flowers, at least the staminate, not in aments. 

 a. Ovary superior. 



Gynoecium of 1 or several and distinct carpels : stigma and style 



solitary. 

 Carpel solitary. 



Style lateral and oblique. 



Petiveriaceae in Order CHEXOPODIALES. 

 Style axile, erect. 



Ovary neither enclosed nor seated in a hypanthium or a 

 calyx-tube. Urticaceae in Order URTICALES. 



Ovary enclosed in or seated in a hypanthium or a calyx- 

 tube. 

 Stamens borne under the gynoecium. 



Allioniaceae in Order CHEXOPODIALES. 

 Stamens borne on the hypanthium or adnate to the 

 calyx-tube. Order THTMELEALES. 



Carpels several. 



Stamens inserted below the ovary. 



Families in Order RAXALES. 



Stamens inserted on the edge of a cup-shaped hypanthium. 



Rosaceae in Order ROSALES. 



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 POLYGOXALES. 

 Leaves estipulate, or if stipules are present they are not 



sheathing. 

 Trees or shrubs. 



Anthers opening by slits : ovary not seated in a 

 hypanthium. Ulmaceae in Order URTICALES. 



Anthers opening by hinged valves : ovary seated in 

 an accrescent hypanthuim. 



Lauraceae in Order THTMELEALES. 

 Herbs or vines. 



Leaves with stipules. 



Families in Order CHEXOPODIALES. 

 Leaves without stipules. 



Stigmas entire. Order CHEXOPODIALES. 



Stigmas 2-cleft. 



Euphorbiaceae in Order ECPHORBIALES. 

 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. 

 Herbs. 



Flowers perfect. 



Ovary several-celled. 



Families in Order CHEXOPODIALES. 

 Ovary 1-2-celled. 



Stamens not tetradynamous, 4-8: ovary 

 1-celled. Order CHEXOPODIALES. 



Stamens tetradynamous : ovary 2-celled. 



Brassicaceae in Order PAPAVERALES. 

 Flowers monoecious or dioecious. 



Euphorbiaceae in Order EUPHORBIALES. 

 Trees or shrubs. 



Gynoecium 5-carpellary, the carpels nearly distinct. 



Buettneriaceae in Order MALVAL&S. 



