ANALYTICAL KEY. XXV 



Four or five, generally as many as the lobes of the corolla 



Flowers in an involucrate head : stipules none. 176 (56) DIFSACE^B 

 Flowers if in heads not involucrate. 



Leaves \vhorled without stipules. ^ 



Leaves opposite, or rarely whorled, with i- 168 (56) RUBIACEJS. 



stipules. 



Leaves opposite without stipules (or some- 

 times with appendages to the petioles 

 imitating them). ... 163 (55) CAFRIFOLIACE^. 



* 4(= Ovary free from the calyx (superior). 

 v- Corolla irregular: stamens (icith anthers) 4 and didynamous, or only 2. 



Ovules and seeds solitary in the (1-4) cells. 



Ovary 4-lobed, the style rising from between the lobes. 300 (67) LABIATE. 

 Ovary not lobcd, the style from its apex. . . 298 (66) VERBENACE<E. 

 Ovules numerous or as many as 2 in each cell. 

 Ovary and pod 1 -celled, 



With a free central placenta : stamens 2 : aquatics. 275 LENTIBULACE. 

 With 2 or more parietal placentae : stamens 4. 



Plants with ordinary foliage (63) GESNERIACE^E. 



Plants leafless, root-parasitic. . . . 279 OHOBANCHACEJE. 



Ovary and fruit more or less 4 - 5-cclled. Martynia. 



. 278 (63) BIGNOMACEJE. 

 Ovary and pod 2-celled, but the 2 placentae parietal; ) 



Ovary and pod 2-celled : placentae in the axis. 



Seeds numerous, rarely few, not on hooks, &c. 281 (64) SCROPHULARIACE^E. 

 Seeds few, borne on hook-like, or slender, or else cup- 

 shaped projections of the placentae. . 296 (66) ACANTIIACEJE. 



+-*- Corolla somewhat irregular: stamens (with anthers) 5. 



amens free from the corolla or nearly so : anthers open- 

 ing by a hole at the top of each cell. . Azalea, 245 (61) ERICACE.B. 

 Slamens inserted on the corolla. 



Filaments or some of them woolly. Verbascum, 281 SCROIMIULARIACK^. 

 Filaments not woolly. ...... 338 (71) SOLANACE.E. 



H- -i- - Corolla regular. 

 +* Stamens as many as the lobes of the corolla. 



Ovaries 2, separate ; their 



Styles and stigmas also wholly separate. Dichondra, 332 CONVOLVULACE^!. 

 Stigmas and sometimes styles united into one. 



Filaments distinct: pollen in ordinary grains. 349 (73) APOCYNACE^. 



Filaments commonly monadelphous : anthers united 



with the stigma : pollen in masses. . 350 (72) ASCLEPIADACE;E. 

 Ovary one, but deeply 4-lobed around the style. 319 (69) BQKRAGINACEJE 



