i 



i 



I 



KEY TO THE FAMILIES 5 



Carpels fewer than the sepals. 2 or rarely 3, distinct or 

 only partly iinited; plant scarcely succulent. 



57. Saxifragaceae 376 



Shi-ubs or trees; fruit thin-walled follicles; stipiiles present. 



(Opulaster in) 60. Rosaceae 399 



Endosperm wanting or scant; stipules mostly present. 



Carpels several or numerous, or, if soUtary, becoming an achene. 



60. Rosaceae 399 



Carpel solitary, not becoming an achene. 



Ovary 2-ovuled; fruit -a drupe; leaves simple. 



62. Amygdalaceae 450 



Ovary several-ovuled ; fruit a legume; leaves pinn.ately 



compoimd. 63. IMimosaceae 452 



Flowers irregular (mostly zygomorphic). „ ^ 



Upper petal enclosed by the lateral ones in the bud; corolla not 



papUionaceous. 64. Caesalpiniaceae 453 



Upper petal enclosing the lateral ones in bud ; corolla papilionace- 

 ous. 65. Fabaceae 454 



Caxpels several and united. 



a. Ovary superior. 



* Stamens inserted at the base of the ovary or receptacls. 



t Stamens numerous. 



Sepals imbricate. 



Filaments imited in 3 or more sets; leaves pellucid-punctate. 



82. Hypebicaceae 563 



Filaments distinct; leaves not punctate. 



Calyx deciduous. 50. Papaveraceae 316 



Calvx persistent. 



Stigmas distinct or united, but not discoid; land 

 plants; petals and sepals 4. 



53. C.U'paridaceae 370 



Stigmas united into a disk; aquatic plants; petals 



and sepals numerous. 47. Nymphaeace.a.e 284 



Sepals valvate; stamens with united filaments. 



81. Malvaceae 556 



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

 Stamens as many as the petals and opposite them. 



Anther-sacs opening by hinged valves. 



49. Berberidaceae 315 



Anther-sacs opening by sUts. 



Flowers monoecious. 74. Euphorbiaceae 541 



Flowers perfect. 42. Portulacace.^e 262 



Stamens as many as the petals and alternate with them, or 

 more, sometimes twice as many. 



Stamens 6 or less; petals 4: sepals 2 or 4. 



Sepals 2; endosperm present; flowers irregular; stamens 



diadelphous. 51. Fdivl\riaceae 319 



Sepals 4, rarely more; endosperm wanting; flowers 

 regular. 

 Capsule 2-celled; stamens tetradynamous, rarely 2 



or 4. 52. Brassicaceae 321 



Capsule 1-celled; stamens not tetradynamous. 



53. Capparidaceae 370 



Stamens, petals, and sepals of the same number, or sta- 

 mens more, usually twice as many as the sepals or 

 petals. 

 Ovary 1-celled. 



Ovules, or seeds, on basal or central placentae. 



Sepals 2; or, if more (in Lewisia), plant scapose, 

 with fleshy basal leaves and the flowers soli- 

 tary on a jointed scape. 



42. PORTtriACACEAE 262 



Sepals 4-5; plants leafy-stemmed. 



Sepals distinct; petals not clawed; ovary 



sessile. 44. Alsinaceae 268 



Sepals united; petals clawed; ovary more or 

 less distinctly stipitate. 



45. Caryophyllaceae 280 

 Ovules, or seeds, on parietal placentae. 



Stamens with imited fllaments and no stamin- 



odia. 81. M.'V.lvaceae 555 



Stamens with distinct fllaments. 

 Staminodia present. 



56. Parnassiace.\E 375 



