viii GENERAL KE¥. 



Stamens separate, inserted on the corolla. 



One-3, always fewer than the corolla-lobes. 



Valerianaceae in VALERIANALES 304 

 Four or 5 ; leaves opposite or whorled. 



Ovary 1-celled ; flowers in a dense involucrate head. 



DiPSACACEAE IN VALERIANALES 304 

 Ovary 2-5-celled „ RUBIALES 298 



2. Ovary sujjerior. 

 Corolla irregular ; stamens with anthers 4 and didynamous or only g. 



POLEMONIALES 262 

 Corolla somewhat irregular; stamens with anthers, 5. 



Stamens free from the corolla; anthers with their cells opening by 



a hole or chink at the top Azalea in ERICALBS 246 



Stamens inserted on the corolla. 



Ovary deeply 4-lobed around the style. 



EcHiUM in POLEMONIALES 271 

 Ovary not lobed ; pod many-seeded. 



Filaments, or some of them, woolly. 



Verbascum in POLEMONIALES 286 

 Filaments not woolly. 



Hyoscyamus in POLEMONIALES 285 

 Corolla regular. 



A. Stamens as niaiiy as the lobes of the corolla. 



Ovaries 2, separate GENTIANALES 253 



Ovary 1, but deeply 4-Iobed around the style POLEMONIALES 262 



Ovary 1, not deeply lobed. 



One-celled, with ovules parietal or on 2 parietal placentae. 

 Leaves (or in Menyanthes 3 leaflets) entire. 



Gentianaceae in GENTIANALES 253 

 Leaves toothed, lobed or pinnately compound. 



Hydrophyllaceae in POLEMONIALES 262 

 Two-lO-celled. 



Leafless j)arasitic twining plants. 



CuscuTA in POLEMONIALES 264 

 Leaves opposite, their bases or petioles connected by stipules 



or stipular line Loganiaceae in GENTIANALES 253 



Leaves when opposite without stipules. 



Stamens free from corolla or nearly so ; style 1. 



Ericaceae in ERICALES 244 

 Stamens almost free from the corolla ; style none. 



Ilicaceae in SAPINDALES* 214 

 Stamens in the sinuses of the corolla; style 1. 



Diapensiaceae in ERICALES 244 

 Stamens inserted on the tube of the corolla. 

 Four; pod 2-celled, cireumscissile. 



Plantaginaceae in PLANTAGINALES 297 

 Four; ovary 2-4-celled, ovules solitary. 



Verbenaceae in POLEMONIALES 262 

 Five or rarely more POLEMONIALES 262 



B. Stamens fewer than the lobes of the corolla. 



Stamens 4, didynamous POLEMONIALES 262 



Stamens only 2 with anthers, ovary 4-lobed. 



Lycopus in POLEMONIALES 280 

 Stamens 2, rarely 3 ; ovary 2-celled. 



Herbs with the corolla rotate, or somewhat funnel-form, and 



slightly irregular Veronica in POLEMONIALES 290 



Shrubs or trees, corolla perfectly regular. 



Oleaceae in GENTIANALES 253 



