ANALYTICAL KEY. XXV 



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

 Flowers in an iuvolucrate head : stipules none. 176 (56) DIPSACE.E 

 Flowers if in heads not involucrate. 



Leaves whorled without stipules. ^ 



Leaves opposite, or rarely whorled, with [-168 (56) RUBIACEJB. 



stipules. 



Leaves opposite without stipules (or some- 

 times with appendages to the petioles 

 imitating them). .".- , ] . 163 (55) CAPRI FOLIAGES, 



* * Ovary free from the calyx (superior). 

 *- Corolla irregular : stamens (with 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 lobed, 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-a:. 

 With 2 or more parietal placenta : stamens 4. 



Plants with ordinary foliage (63) GESNERIACE-E. 



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

 Ovary and fruit more or less 4 - 5-celled. Martynia, ) 



J . f 278 (63) BIGNONIACEJ3. 



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

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



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



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

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



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



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

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

 Stamens inserted on the corolla. 



Filaments or some of them woolly. Verbascum, 281 SCROPHULARIACE.B. 



Filaments not woolly 338 (71) SOLANACEJE. 



-*-*- Corolla regular. 

 M- Stamens as many as the lobes of the corolla. 



Ovaries 2, separate ; their 



Styles and stigmas also wholly separate. Dichondra, 332 CONVOLVTJLACEJE. 

 Stigmas and sometimes styles united into one. 



Filaments distinct : pollen in ordinary grains. 349 (73) APOCYXACE.E. 

 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) BORRAGINACE.E. 



