XViil KEY TO THE FAMILIES 



1. 



Corolla irregular. 

 Ovary 1- eel led. 



Stamens six, diadelphous. PAPAVERACEAE, 95. 



Stamens ten. PAPILIONACEAE, 111. 



Stamens two to four. 



Aquatics. LENTIBULARIACEAE, 174. 



Leafless herbs. OROBANCHACEAE, 174. 



Leafy herbs. MARTYNIACEAE, 175. 



Ovary 2-celled, 2-seeded. VERBENACEAE, 158. 



Ovary 2-celled, four-many-seeded. 



Stamens six or eight. POLYGALACEAE, 122. 



Stamens two, four or five. 



Woody plants. BIGNONIACEAE, 175. 



Herbs. 



Seeds borne on hook-like projec- 

 tions. ACANTHACEAE, 176. 

 Seeds not borne on hook -like projec- 

 tions. SCROPHULARIACEAE, 169. 

 Ovary 4-celled or deeply 4-parted. 



Stamens five. BORAGINACEAE, 156. 



Stamens two or four. 



Ovary four-celled. VERBENACEAE, 158. 



Ovary deeply four-lobed. LABIATAE, 159. 



Corolla regular. 

 Herbs. 



Ovaries two, distil ct. 



Pollen simple. APOCYNACEAE, 149. 



Pollen united into waxy masses. ASCLEPIADACEAE, 150. 



Ovary deeply 4-lobed around a common 



style. 



Stamens five. BORAGINACEAE, 156. 



Stamens two or four. LABIATAE, 159. 



Ovary 4-celled, 4-ovuled. VERBENACEAE, 158. 



Ovary 5-celled. 



Leafless saprophytes. MONOTROPACEAE, 145. 



Plants with trifoliolate leaves. OXALIDACEAE, 120. 



Ovary 1-celled ; style and stigmas one. 



With one parietal placenta. MIMOSACEAE, 110. 



With a central placenta. PRIMULACEAE, 146. 



Ovary 1-celled ; stigma 2-lobed. 

 Ovules many. 



Leaves opposite ; plants glabrous. GENTIANACEAE, 148. 

 Leaves opposite ; plants not glabrous. MARTYNIACEAE, 175. 

 Leaves alternate, deeply-lobed. HYDROPHYLLACEAE, 155. 



Ovule one. PHRYMACEAE, 176. 



Ovary 3 celled. POLEMONIACEAE, 154. 



Ovary 2-celled. 



Leafless parasitic vines. CUSCUTACEAE, 153. 



Herbaceous vines. CONVOLVULACEAE, 152. 



Ordinary herbs. 



Corolla scarious. PLANTAGINACEAE, 177. 



Corolla not scarious. 



Ovules borne on hooks. ACANTHACEAE, 176. 



Ovules not borne on hooks. 



Fruit a berry or prickly capsule. SOLANACEAE, 166. 

 Fruit a capsule. SCROPHULARIACEAE, 169. 



