t t Ovaries 2-5, separate above, more or less united below. 

 Leaves pellucid-punctate. . Rutaceae, 27. 



Leaves not pellucid-punctate. 

 Trees or shrubs; leaves opposite, palmately lobed or pinnate; fruit a 



samara. Acrraceae, 30. 



A small shrub; leaves opposite, 3-foliolate. Staphyleaceae, 31. 



t t t Ovary 5-lobed, 5-celled; style compound. Geraniaceae, 26. 



f f f f Ovarii simple, 1-celled with one parietal placenta. 

 Flowers irregular, the upper petal enclosing the others in the bud. 



Papilionaceae, 33. 

 Flowers mostly regular, the upper petal enclosed by the lateral in the 

 bud. Caesalpinaceae, 42. 



f f f f t Ovary 1, compound, as shown by the number of cells, placentae, styles, 



or stigmas. 

 Ovary 1-celled. 



Corolla irregular, spurred; petals 4; stamens 6. Fumaeiaceae, 9. 



Corolla irregular, lower petal spurred; petals and stamens 5. 



VlOLACEAE, 17. 



Corolla regular or nearly so. 



Ovule 1; stigmas 3; small trees or shrubs with resinous or milky acrid 



juice. Anacakdiaceae, 32. 



Ovules 1 or 2; herbs. A few of the Cruciferae, 10. 



Ovules 2 or more, central or basal. 



Petals inserted on the throat of the calyx. Lythraceae, 55. 



Petals not inserted on the throat of the calyx. Caryophyllackae, 19 

 Ovules several or many, on two or more parietal placentae. 



Leaves pellucid-punctate or black-dotted. Hypericaceae. 22. 



Leaves non-punctate. 



Sepals 5, unequal or only 3. Cistaceae, 17. 



Sepals and petals 4; stamens 6. Cruciferae, 10. 



Sepals and petals 5; stamens 5 or 10. Saxifragaceae, 51. 



Ovary 2-several-celled; flowers irregular. 



Stamens 6 or 8; anthers 1-celled, opening at the top. Polygalaceae, 21. 

 Stamens 11 or 12, dehiscence longitudinal; petals inserted on the throat 



of the gibbous or spurred calyx. Cuphea, in Lithraceae, 55. 



Stamens 5 to 8 or 10; petals mostly hypogynous. 



Ovary 3-celled; leaves opposite, digitate; trees. Hippocastanaceae, 31. 

 Ovary 5-celled; leaves alternate, simple; herbs. Balsaminaceae, 27. 

 Ovary 2-several-celled; flowers regular. 



Stamens neither the same nor twice the number of the petals. 

 Petals 5; stamens collected into 3 clusters. Hypericaceae, 22. 



Petals 4; stamens 6, 2 shorter, rarely 2 or 4. Cruciferae, 10. 



Petals 5; stamens more, distinct. Aceraceae, 30. 



Stamens of the same or twice the number of the petals. 

 Ovules and seeds 1 or 2 in each cell. 



Herbs, with perfect symmetrical flowers. 



Ovary deeply lobed, 5-celled; sepals 5. Geraniaceae, 26. 



Ovary globose, breaking into 5 2-celled carpels, sepals 5. 



LlNACEAE, 26. 



Shrubs or trees. 

 Leaves 3-foliolate, pellucid-punctate. RutaceAe, 27. 



Leaves palmately lobed and veined; fruit a 2-winged samara. 



Aceraceae, 30. 



