ANALYTICAL KEY. 25 



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

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



Leaves toothed, lobed, or pinnately compound. IIvDRoi'in llace^, 357 

 Two- to ten-celled. 



Leafless parasitic twinini^ plants. Cuscuta, in Coxvolvulace^, 370 



Leaves opposite, their bases or petioles connected 



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

 Leaves when opposite without stipules. 



Stamens free from the corolla or nearly so; style 1. ERiCACEiE, 309 



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



Stamens in the sinuses of the corolla; style I. DiAPENSiACEiE, 326 



Stamens inserted on the tube of the corolla, 



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



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



Five or rarely more. 



Fruit of two or four seed-like nutlets. . Borragixace^, 3G0 



Fruit a few-seeded pod. 



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

 Sepals 5 ; styles 1 or 2, entire or 2-cleft ; seeds 



large, only one or two in a cell. CoxvoLVCLACEiE, 3G7 

 Fruit a many-seeded pod or berry. 



Styles 2. . . . Ilydrolea, in Hydropiiyllace.e, 3G0 

 Style single Solanace^, 373 



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



Stamens 4, didynamous. 



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



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

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

 Stamens 2, rarely 3 ; ovary 2-celled. 



Low herbs ; corolla scarious, withering on the pod. Plantaginace^e, 422 



Herbs ; corolla rotate, or somewhat funnelform, aud 



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



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



Division 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 Auistolochiace^, 444 



Four-celled; stamens 4. .... Ludwigia, in Onagrace.*, 187 

 One-celled, with parietal placental. Chrysosplenium, in Saxieragace.e, 172 



Ovary aud pod wholly naked (there being no calyx), 



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



Two-celled, many-ribbed ; aquatic herb. . . . PoDOSXEMACEiE, 444 



