KEY TO THE ORDERS ix 



Trees or shrubs. 



Gynoecium u-carpellary, the carpels nearly distinct. 



lUiettneriaceae in Order M.vlv.\les. 

 Gynoecium 2-4-carpellary, the carpels united. 

 Ovary 4-celled : fleshy maritime shrubs. 



Batidaceae in Ordor Chesopodi.^i.e.s. 

 Ovary 2-ceIled : plants not fleshy. 



Oleaceae in Order Oleales. 

 Stamens perigynous or epigynous, Inserted on the margin 

 of a hypanthium or a disk. 

 Fruit a samara. Families in Order Sapindales. 



Fruit not a samara. 



Fruit drupe-like or berry-like : shrubs or trees. 



Order Rhamnales. 

 Fruit a capsule : herbs. Order Aristolochiales. 



b. Ovary inferior. 



Flowers not In Involucrate heads. 



Fruit S-winged, splitting Into 3 nutlets. 



Gounnia In Order Rhamnales. 

 Fruit neither 3-wlnged nor splitting into carpels. 

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



("alyx deciduous as a lid : stamens numerous. 



Calyptranthes in Order Myrtales. 

 Calyx of valvate or imbricated sepals : stamens few. 

 "stamens as many as the perianth-members and 

 alternate with them, or fewer. 



Tetragoniaceae in Order Chenopodiales. 

 Stamens as many as the perianth-members and op- 

 posite them, or twice as many. 

 Styles present. 



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. 

 Styles wanting : stigmas sessile. 



Gunneraceae In Order Myrtales. 

 Fruit a capsule. Order Myrtales. 



Flowers, at least the stamlnate. In Involucrate heads. 



Ambrosiaceae in Order Carduales. 

 B. 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, /. e., hypogynous. 



Plants with relatively firm stems and leaves, not succulent. 



Order Ranales. 

 Plants with succulent stems and leaves. Sedaceae In Order Rosales. 

 Stamens on the margin of a hypanthium. 



Plants without secreting glands in the hark. Order Rosales. 



Plants with secreting glands In the bark. 



Surlanaceae in Order Geraniales. 

 Carpels several and united. 

 tOvary superior. 



IStamens inserted at the base of the ovary or receptacle. 

 § Stamens numerous. 

 Sepals Imbricated. 



Calyx deciduous. Order Papaverales. 



Calyx persistent. 



Styles or stigmas distinct or united, but not discoid. 

 Leaves glandular or pellucid-punctate. 



Rutaceae In Order Geraniales. 

 Leaves not glandular. 



Capparidaceae in Order Papaverales. 

 Styles or stigmas united into a disk. 



Nymphaeaceae In Order Ranales. 

 Sepals valvate. 



Stamens with distinct filaments. 



Ovary 1-celled : placentae parietal. 



Capparidaceae In Order Papaverales. 

 Ovary 2-several-celled : placentae axile or central. 



Families In Order Malvales. 

 Stamens with united filaments. Order Malvales. 



§§Stamens few, not over twice as many as the petals. 



