ANALYTICAL KEY. 25 



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

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



Leaves toothed, lobed, or pinnately compound. HYDROPHYLLACE^E, 357 

 Two- to ten-celled. 



Leafless parasitic twining plants. Cuscuta, in CONVOLVULACE^J, 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. ERICACEJS, 309 

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



Stamens in the sinuses of the corolla; style 1. DIAPENSIACE^E, 326 

 Stamens inserted on the tube of the corolla, 



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

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

 Five or rarely more. 



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

 Fruit a few-seeded pod. 



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

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



large, only one or two in a cell. CONVOLVULACEJE. 367 

 Fruit a many-seeded pod or berry. 



Styles 2. ... Hydrolea, in HYDROPHYLLACE^E, 360 

 Style single SOLANACE^, 373 



- *- Stamens fewer than the lobes of the corolla. 



Stamens 4, didynamous. 



Ovary 2-celled ; the cells several-seeded. . . . ACANTHACE.E, 399 



Ovary 2- 4-celled; the cells 1 -seeded. . . . VERBENACEJB, 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. PLANTAGINACE^B, 422 



Herbs; corolla rotate, or somewhat funnelform, and 



slightly irregular. . . . Veronica, in SCROPHULARIACE^E, 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 ARISTOLOCHIACE^B, 444 



Four-celled ; stamens 4 Ludwigia, in ONAGRACE^E, 187 



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



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



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

 Two-celled, many-ribbed ; aquatic herb. . , . PODOSTEMACE^:, 444 



