XVlll 



KEY TO THE FAMILIES 



1. 

 Corolla irregular. 

 ^ Ovary 1- eel led. 



Stamens six, diadelphous. 

 Stamens ten. 

 Stamens two to four. 

 Aquatics. 

 Leafless herbs. 

 Leafy herbs. 

 Ovary 2-celled, 2-seeded. 

 Ovary 2-eelled, four-many-seeded. 

 Stamens six or eight. 

 Stamens two, 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 Ave. 

 Stamens two or four. 

 Ovarj' four-celled. 

 Ovary deeply four lobed. 

 Corolla regular. 

 Herbs. 



Ovaries two, distil ct. 

 Pollen simple. 



Pollen united into waxy masses. 

 Ovarj' deeply 4- lobed around a common 

 style. 

 Stamens five. 

 Stamens two or four. 

 Ovary 4-celled, 4-ovuled. 

 Ovary 5-celled. 



Leafless saprophytes. 

 Plants with trifoliolate leaves. 

 Ovary 1-celled ; 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 2- celled. 



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. 



Papaveeaceae, 95. 

 Papilionaceae, in. 



Lentibulariaceae, 174. 

 oroba^x'haceae, 174. 

 Martyniaceae, 175. 

 Verbenaceae, 158. 



Polygalaceae, 122. 



BiGNONIACEAE, 175. 



acanthaceae, 176. 



scrophulariaceae, 169. 



Boraginaceae, 156. 



Verbenaceae, 158. 

 Labiatae, 159. 



Apocynaceae, 149. 

 Asclepiadaceae, 150. 



Boraginaceae, 156. 

 Labiatae, 159. 

 Verbenaceae, 158. 



monotropaceae, 145. 

 Oxalidackae, 120. 



MiMOSACEAE, 110. 



Primulaceae, 146. 



Gentianaceae, 148. 

 Martyniaceae, 175. 

 hvprophyllaceae, 155. 

 Phry.maceae, 176. 

 polemoniaceae, 154. 



Cuscutaceae, 153. 

 Convolvulaceae, 152. 



Plantaginaceae. 177. 



Acaxthaceae, 176. 



solanaceae, 166. 



SCEOl'HULARIACEAE, 169. 



