Apetalous forms in polypetalous families. 

 Forms having the corolla and sometimes the calyx wanting; calyx often 

 petaloid. 



* Ovary or its cells with many ovules. 

 Ovary inferior, 4-celled; stamens 4. Ludwigia, in Onagbaceae, 56. 



Ovary inferior, 1-celled; stamens usually 8. Chrysosplenium, in 



Saxifbagaceae, 52. 

 Ovary superior. 



Pod 5-celled, 5-beaked, the beaks falling away at maturity; stamens 10. 



Penthorum, in Cbassulaceae, 53. 

 Pod 3-celled, 3-valved, many-seeded. Aizoaceae, 60. 



Pod 1 or 2-celled; placentae central. 



Stamens inserted on the calyx. Lythbaceae, 55. 



Stamens hypogynous or inserted at the base of the calyx. 



Cabyophyllaceae, 19. 

 Pod 1-celled, with one parietal placenta. Ranunculaceae, 1. 



Pods 2 or more, separate, simple. Ranunculaceae, 1. 



* * Ovary or its cells usually with 1 or 2 ovules. 

 Pistils 3 or more, distinct or nearly so. 



Stamens hypogynous; leaves punctate. Rutaceae, 27. 



Stamens hypogynous; leaves not punctate; calyx usually petaloid. 



Ranunculaceae, 1. 

 Pistil 1, simple or compound. 



Ovary inferior, 3 or 4-celled; aquatics. Halobagidaceae, 54. 



Ovary naked; calyx none. Callitriche, in Halobagidaceae, 55. 



Ovary free from the calyx; trees or shrubs. 



Ovary 2-celled; fruit a 2-winged samara. Acebacbae, 30. 



Ovary 3-celled; fruit drupaceous or dry. Rhamnaceae, 29. 



