ANALYTICAL KEY. 25 



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

 Leaves (or in Menyanthes three leaflets) entire. Gentianace^, 346 



Leaves toothed, lobed, or pinnately compound. Hydrophyllace^, 357 

 Two- to ten-celled. 



Leafless parasitic twining plants. Cuscuta, in Convolvulace^, 370 



Leaves opposite, their bases or petioles connected 



by stipules or a stipular line. . . . Loganiace^, 345 

 Leaves when opposite witliout stipules. 



Stamens free from the corolla or nearly so; style L Ericace^, 309 



Stamens almost free from the corolla; style none. Ilicixe^, 107 



Stamens in the sinuses of the corolla; style 1. DiAPExsiACEiE, 326 



Stamens inserted on the tube of the corolla, 



Four ; pod 2-celled, circumscissile. . . Plantagixace^, 422 



Four; ovary 2 - 4-celled ; ovules solitary. , Verbexace^, 401 



Five or rarely more. 



Fruit of two or four seed-like nutlets. . Borraginace^, 360 



Fruit a few-seeded pod. 



Calyx 5-cleft ; style 3-lobed or -cleft. . Polemoxiace^, 354 

 Sepals 5 ; styles 1 or 2, entire or 2-clef t ; seeds 



large, only one or two in a cell. Coxtolvdlace^, 367 

 Fruit a many-seeded pod or berry. 



Styles 2. . . . Hydrolea, in Hydrophyllace^, 360 

 Style single Solaxace^, 373 



H- •*- Stamens Jewer than the lobes of the corolla. 



Stamens 4, didynamous. 



Ovary 2-celled ; the cells several-seeded. . . . Acax^thace^, 399 



Ovary 2 -4-celled ; the cells 1-seeded. . . . Verbexace^, 401 

 Stamens only 2 with anthers ; ovary 4-lobed. . Lycopus, in Labiate, 408 

 Stamens 2, rarely 3 ; ovary 2-celled. 



Low herbs ; corolla scarious, withering on the pod. PLANTAGlNACE.a:, 422 



Herbs; corolla rotate, or somewhat funnelform, and 



slightly irregular. . . Veronica, in Scrophulariace^, 386 



Shrubs or trees ; corolla perfectly regular Oleace.e, 335 



Divisiox III. APETALOUS : corolla (and sometimes calyx) wanting. 



A. Flowers not in catkins. 

 1, Ovary or its cells containing many ovules. 



Ovary and pod inferior (i. e. calyx-tube adherent to the ovary). 



Six-celled; stamens 6-12 Aristolochiace^, 444 



Four-celled; stamens 4 Ludwigia, in Oxagrace^, 187 



One-celled, with parietal placentae. Chrysosplenium, in Saxifragace^, 172 



Ovary and pc^i wholly naked (there being no calyx), 



Two-celled, 2-beaked ; flowers capitate ; tree. . Hamamelide^, 179 



Two-celled, many-ribbed ; aquatic herb. . r . Podostemace^. 444. 



