54 MISC. PUBLICATION 4 2 3, U. S. DEPT. OF AGRICULTURE 



52. Carpel 1, or, if carpels more than 1, these united at least until 

 maturity (59). 

 59. Leaves compound, or the blades pinnatifid or deeply palmately 

 lobed (60). 

 60. Fruit juicy, berrylike (61). 



61. Plant not vinelike, the stems erect; leaves large, decom- 

 pound; stamens numerous: Genus Actaea. 



42. Ranunculaceae. 



61. Plant vinelike, the stems climbing or trailing; leaves 



digitate, with 5 to 7 leaflets; stamens 5: Genus Par- 



thenocissus 72. Vitaceae. 



60. Fruit dry (62). 



62. Fruit a 2-valved pod, or sometimes dehiscent by apical 



valves in family Papaveraceae, rarely transversely 



multicellular and indehiscent in family Cruciferae (63). 



63. Sepals 2 or 3; plants herbaceous; leaves decompound 



with narrow segments, or sinuate-pinnatifid and 



prickly; stamens numerous. _ 45. Papaveraceae. 



63. Sepals or calyx lobes 4 or 5 (64). 



64. Calyx gamophyllous with 4 or 5 teeth or lobes; 

 stamens numerous; leaves bip innate; plants most 

 woody: Subfamily Mimosoideae. 



54. Leguminosae. 



64. Calyx of 4 separate sepals ; plants herbaceous (65) . 



65. Ovary 2-celled, stipitate or sessile; stamens 6, 



tetradynamous (2 shorter, 4 longer, barely so 



in genus Stanley a) ; leaves pinnate or pinnatifid. 



46. Cruciferae. 



65. Ovary commonly 1-celled, stipitate; stamens 6 or 



more, not tetradynamous; leaves digitately 3- 



to 5-foliolate 47. Capparidaceae. 



62. Fruit a 3- to 5-celled, or apically 3-valved, capsule (66). 



66. Ovary not lobed, appearing externally as one carpel; 



flowering shoots from rootstocks bearing bulblets: 



Genus Lithophragma 50. Saxifragaceae. 



66. Ovary lobed, of 5 carpels, these becoming more or less 



separate in fruit after maturity; bulblets none (67). 



67. Styles separating at maturity from the central 



column; leaves palmately lobed, or pinnate with 



pinnatifid leaflets 55. Geraniaceae. 



67. Styles not separating from the column; leaves pin- 

 nate or digitately 2- or 3-foliolate, the leaflets 



entire 58. Zygophyllaceae. 



59. Leaves simple, never pinnatifid or palmately lobed (68). 

 68. Plants shrubby; sepals or calyx lobes 4 to 6 (69). 



69. Leaves with well-developed blades, these narrow, emar- 

 ginate at apex, otherwise entire, lepidote beneath; 

 plant not spiny; fruit berrylike: Genus Atamisquea. 



47. Capparidaceae. 

 69. Leaves reduced to small scales; plants very spiny (70). 

 70. Petals, stamens, and carpels 5; fruit a dry turgid 5- 

 valved capsule: Genus Canotia. 



68. Celastraceae. 

 70. Petals 4; stamens 8; carpels 2; fruit a globular berry. 



81. Koeberliniaceae. 

 68. Plants herbaceous or, if somewhat woody, then the sepals 

 usually 2, or the plant succulent, or the fruit a 2-valved 

 capsule (71). 

 71. Sepals united most of their length (72). 



72. Styles 2 to 5; stamens 10, free from the calyx. 



40. Caryophyllaceae. 



72. Style 1 ; stamens and petals borne on the calyx. 



87. Lythraceae. 

 71. Sepals separate to the base or nearly so (73). 



73. Petals more numerous than the sepals, the latter 



commonly 2 39. Portulacaceae. 



