24 ANALYTICAL KEr. 



Stamens separate, inserted on the corolla, 



One to three, always fewer than the corolla-lobes. Valerianace^, 228 

 Tour or five ; leaves opposite or whorled. 



Ovary 1 -celled ; flowers in a dense involucrate head. Dipsace;e, 229 

 Ovary 2-5-celled. 



Leaves whorled and without stipules. ) Rubiace^ 222 



Leaves opposite or whorled, and with stipules. ) 

 Leaves opposite without stipules (petioles some- 

 times with stipule-like appendages). . Caprxfoliace^, 216 



2. Ovary free from the cahjx [superior], 

 * Corolla irregular: stamens {with anthers) 4 and didi/namous, or only 2 



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



Ovary 4-lobed, the style rising from between the lobes. Labiate, 403 



Ovary not lobed, the style from its apex. . . Verbenacs^, 401 



Ovules numerous or at least as many as 2 in each eelL 

 Ovary and pod 1 -celled. 



With a free central placenta ; stamens 2 . LENTiBULACEiE, 395 



Witli 2 or more parietal very many-seeded placentae ; 



stamens 4 Orobanchace^, 393 



Ovary and fruit more or less 4 - 5-celled. . . . Pedaliace^, 399 

 Ovary and pod 2-celled, but the 2 placentas parietaL Bignoniace^, 398 

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



Seeds rarely few, not on hooks, with albumen. ScROPHULARiACE.ffl;, 377 

 Seeds few, borne on hook-like or other projections 



of the placentae : no albumen. . . . Acanthace.^;, 399 



* * Corolla someichat irregular : stamens (with anthers) 5. 



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



a hole or chink at the top. Rhododendron, in ERiCACE.ffi!, 320 



Stamens inserted on the corolla. 



Ovary deeply 4-lobed around the style. Echium, in Borraginace^, 367 

 Ovary not lobed; pod many-seeded. 

 Filaments or some of them woolly. Verbascum, Scrophulariace.*;, 37£ 

 Filaments not woolly. . . . Hyoscyamus, Solanace^, 376 



* * * Corolla regular. 

 •*-' Stamens as many as the lobes of the corolla. 

 Ovaries 2, separate ; their 



Styles and stigmas also wholly separate. Dicbondra, Contolvulace.^, 368 

 Stigmas and sometimes styles united into one. 



Filaments distinct ; pollen in ordinary grains. . ApocTNACEiE, 337 



Filaments monadelphous ; pollen in masses. . . Asclepiadace^e, 338 

 Ovary one, but deeply 4-lobed around the style (or 2-lobed in Heliotropium). 

 Leaves alternate. ....... Borragixace^, 360 



Leaves opposite Mentha, in LABiAT.a;, 407 



Ovary one ; pod 2-lobed or 2-homed at "he summit. Loganiace^, 345 



Ovary one ; not deeply lobed, 



One-celled, one-ovuled, becoming an achene. Plantaginace^. 422 



