KEY TO THE FAMILIES 



xv 



Ovary superior. 

 Ovaries many. 



Ovary one, 10-celled, 10-ovuled. 

 Ovary one, 5-celled, 5-horned. 

 Ovary one, 4 celled, 4-ovuled. 

 Ovary one, 3-celled, 3-ovuled. 

 Ovary one, 2-several-celled, many- 



ovuled. 



Leaves verticillate. 

 Leaves not verticillate. 

 Ovary one, 1-celled, many-ovuled. 

 Ovary one, 1-ovuled. 

 Vines or herbs with compound leaves. 

 Herbs with simple leaves and sheath- 

 ing stipules. 

 Herbs with simple leaves ; stipules not 



sheathing. 



Several flowers together and sur- 

 rounded by a 5-lobed bract. 

 Flowers surrounded by scarious 



bracts. 



Bracts if present not scarious. 

 Style and stigma one ; flowers 



not perfect. 



Styles or stigmas two-three. 

 Leaves alternate. 

 Leaves opposite. 



B. 



Ovary superior. 

 Ovary inferior. 



1. 



Corolla irregular. 

 Stamens more than ten. 

 Stamens ten or less. 

 Ovary one-celled and with one parietal 



placenta. 

 Upper petal enclosed by the lateral in 



the bud. 

 Lateral petals enclosed by the upper in 



the bud. 

 Ovary 1-celled and with two parietal 



placentae. 

 Ovary 1-celled and with three parietal 



placentae. 



Ovary 2-celled, 2-ovuled. 

 Ovary 2-celled, several-ovuled. 

 Leaves simple. 

 Leaves pinnate. 

 Ovary 3-celled, 6-ovuled. 

 Ovary 5-celled, several ovuled. 

 Corolla regular. 

 Stamens more than ten and more than 



twice the divisions of the corolla. 

 Pistils few-many. 



Imbedded in pits in the receptacle. 

 On the receptacle. 

 Stamens on the receptacle. 



EANUNCULACEAE, 90. 

 PHYTOLACCACEAE, 84. 

 CRASSULACEAE, 102. 

 CALLITRICHACEAE, 126. 



EUPHORBIACEAE, 122. 



AlZOACEAE, 85. 



LYTHRACEAE, 136. 

 CARYOPHYLLACEAE, 86. 



MORACEAE, 72. 



POLYGONACEAE, 75. 



NYCTAGINACEAE, 84. 

 AMARANTHACEAE, 82. 



URTICACEAE, 73. 



CHENOPODIACEAE, 79. 

 CARYOPHYLLACEAE, 86. 



1. 

 2. 



EANUNCULACEAE, 90. 



CAESALPINIACEAE, 110. 

 PAPILIONACEAE, 111. 

 PAPAVERACEAE, 95. 



VIOLACEAE, 134. 

 POLYGALACEAE, 122. 



LYTHRACEAE, 136. 

 PAPILIONACEAE, 111. 



HlPPOCASTANACEAE, 128. 



BALSAMINACEAE, 129. 



NYMPHAEACEAE, 89. 



