70 University of California Publications in Botany [VOL. 9 



Stamens perigynous. 



Stamens inserted on the edge of a hypogynous disk within the calyx; 

 ovary 2-celled, becoming a 2-winged samara. 



Family 35. Aceraceae 

 Stamens borne on the calyx. 



Leaves simple, exstipulate; stamens 5 or 10; pistil always solitary. 



Family 29. Saxifragaceae 



Leaves simple or compound, stipulate; stamens 10 to numerous; 



pistils 1 to several. Family 30. Rosaceae 



Flowers with stamens united by their filaments, monadelphous or dia- 



delphous. 



Stamens 10 or fewer; flowers irregular; ovary 1-celled; leaves com- 

 pound. 



Stamens 6, diadelphous, in two sets of 3 each; sepals 2 and petals 4; 

 flowers somewhat cordate at base. Family 25. Fumariaceae 



Stamens 10, diadelphous (9 united and 1 free) or monadelphous; 

 sepals and petals 5; flowers papilionaceous. 



Family 31. Leguminosae 



Stamens numerous united by their filaments into a tube about the 

 several-celled ovary; leaves simple. Family 37. Malvaceae 



Calyx united with the pistil or pistils (ovary inferior). 

 Herbaceous plants. 



Flowers not in umbels. 



Flowers apetalous; stamen solitary. Family (40). Hippuris 



. Flowers with petals; stamens more than 1. 

 Style 1; sepals and petals 4 (rarely 5 or 2). 



Family 41. Onagraceae 

 Styles 2 to 5; sepals and petals always 5. 



Family 29. Saxifragaceae 



Flowers in umbels (the rays of the umbel sometimes short and the 

 flowers appearing in capitate clusters). Family 43. Umbelliferae 

 Shrubs. 

 Petals 5. 



Fruit a pome. Family 30. Rosaceae 



Fruit a capsule. 



Stamens 10, anthers basi-fixed; petals plane or merely curving, 



not hooded. Family (29). Jamesia 



Stamens 5, anthers versatile; petals hooded. Family (36). Qeanotlius 



Fruit a berry. Family (29). Eibes 



Petals 4; fruit a drupe. Family 42. Cornaceae 



***Calyx and corolla both present, the latter of more or less united petals. 



Stamens free from the corolla; anthers opening by terminal pores (except 



in Pleuricospora the anthers dehisce by longitudinal slits to the base, 



and in Allotropa to the middle, of each cell). Family 44. Ericaceae 



Stamens inserted on the corolla; anthers opening by longitudinal slits. 



Ovary superior. 



Stamens more than 5. 

 Petals 5, sepals 5. 

 Pistil 1. 



Stamens 10, monadelphous or diadelphous; ovary 1-celled. 



Family 31. Leguminosae 



