24 ANALYTICAL KEY. 



Stamens separate, inserted on the corolla, 



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

 Four or five ; leaves opposite or whorled. 



Ovary 1-celled ; flowers in a dense involucrate head. DIPSJLCE^E, 229 

 Ovary 2 - 5-celled. 



Leaves whorled and without stipules. ) RUBIACE/E 222 



Leaves opposite or whorled, and with stipules. ) 

 Leaves opposite without stipules (petioles some- 

 times with stipule-like appendages). . CAPRIFOLIACE^B, 216 



2. 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. LABIATJE, 403 



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

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

 Ovary and pod 1-celled, 



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

 With 2 or more parietal very many-seeded placentas ; 



stamens 4 . . OROBANCHACEJS, 393 



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

 Ovary and pod 2-celled, but the 2 placentae parietal. BIGNONIACE^J, 398 

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



Seeds rarely few, not on hooks, with albumen. SCROPHULARIACE-E, 377 

 Seeds few, borne on hook-like or other projections 



of the placentae : no albumen. . . . ACANTHACEJE, 399 



# # 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. Rhododendron, in ERICACE^J, 320 



Stamens inserted on the corolla. 



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

 Ovary not lobed; pod many-seeded. 



Filaments or so^me of them woolly. Verbascum, SCROPHULARIACE^E, 37ft 

 Filaments not woolly. . . . Hyoscyamus, SOLANACEJE, 37ft 



* # # Corolla regular. 

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

 Ovaries 2, separate ; their 



Styles and stigmas also wholly separate. Dichondra, CONVOLVULACEJS, 368 

 Stigmas and sometimes styles united into one. 



Filaments distinct ; pollen in ordinary grains. . APOCYNACE^E, 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 BORRAGINACE^E, 360 



Leaves opposite Mentha, in LABIATE, 407 



Ovary one ; pod 2-lobed or 2-horned at he summit. LOGANIACE^E, 345 



Ovary one ; not deeply lobed, 

 One-celled, one-ovuled, becoming an achene. PLANTAGINACEJE, 422 



