XVlll 



KEY TO THE FAMILIES 



Corolla irregular. 

 Ovary 1-celled. 

 Stamens six, diadelphous. 

 Stamens ten. 

 Stamens two to four. 

 Aquatics. 

 Leafless herbs. 

 Leafy herbs. 

 Ovary 2-celled, 2-seeded. 

 Ovary 2-celled, four-many-seeded. 

 Stamens six or eight. 

 Stamens tvpo, four or five. 

 Woody plants. 

 Herbs. 

 Seeds borne on hook-like projec- 

 tions. 

 Seeds not borne on hook-like projec- 

 tions. 

 Ovary 4-celled or deeply 4-parted. 

 Stamens five. 

 Stamens two or four. 

 Ovary four-celled. 

 Ovary deeply four-Iobed. 

 Corolla regular. 

 Herbs. 

 Ovaries two, distinct. 

 Pollen simple. 



Pollen united into waxy masses. 

 Ovary deeply 4-lobed around a common 

 style. 

 Stamens five. 

 Stamens two or four. 

 Ovary 4-oelled, 4-ovuled. 

 Ovary 5-celled. 

 Leafless saprophytes. 

 Plants with trifoliolate leaves. 

 Ovary 1-oelled ; style and stigmas one. 

 With one parietal placenta. 

 With a central placenta. 

 Ovary 1-celled ; stigma 2-lobed. 

 Ovules many. 

 Leaves opposite ; plants glabrous. 

 Leaves opposite ; plants not glabrous. 

 Leaves alternate, deeply-lobed. 

 Ovule one. 

 Ovary 3 celled. 

 Ovary 2celled. 

 Leafless parasitic vines. 

 Herbaceous vines. 

 Ordinary herbs. 

 Corolla scarious. 

 Corolla not scarious. 

 Ovules borne on hooks. 

 Ovules not borne on hooks. 

 Fruit a berry or prickly capsule. 

 Fruit a capsule. 



Papavbbaceab, 95. 

 Papilionackae, 111. 



Lkntibulariacbae, 174. 

 Oeobanchaceae, 174. 

 Maetyniaoeae, 175. 

 Veebknaceae, 158. 



Polygalaceae, 122. 



Bignoniaceab, 175. 



acanthaceae, 176. 

 sceophulariaceae, 169. 



BOEAGINaCBAE, 156. 



Vbrbenaceae, 158. 

 Labiatae, 159. 



Apocynaceab, 149. 

 Asclepiadacbab, 150. 



boeaginaceab, 156. 

 Labiatae, 159. 

 Veebbnaoeae, 158. 



monoteopacbae, 145. 

 oxalidacbab, 120. 



MiMOSACBAB, 110. 



Peimulaceae, 146. 



Gentianaobab, 148. 

 Maetyniaceae, 175. 

 Hydeophyllacbab, 155. 

 Pheymaceab, 176. 

 Polemoniaceab, 154. 



cuscutacbab, 153. 

 Convolvulacbae, 152. 



Plantaginaceab, 177. 



Acanthacbae, 176. 



Solanaceae, 166. 

 sceophulariaceae, 169. 



