ANALYTICAL KEY. 25 



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



Leaves (or iu Menyanthes three leaflets) entire. GENTIAXACEJE, 346 



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

 Two- to ten-celled. 



Leafless parasitic twining plants. Cuscuta, in CONVOLVULACE^E, 370 



Leaves opposite, their bases or petioles connected 



by stipules or a stipular line. . . . LOGANIACE^E, 345 

 Leaves when opposite without stipules. 



Stamens free from the corolla or nearly so ; style 1 . ERICACE.S:, 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 tbe tube of the corolla, 



Four ; pod 2-celled, circumscissile. . . PLAXTAGINACE^E, 422 

 Four; ovary 2 - 4-celled ; ovules solitary. . VERBEXACEJE, 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. . POLEMONIACE.E, 354 

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



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

 Fruit a many-seeded pod or berry. 



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

 Style single SOLANACE.E, 373 



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



Stamens 4, didynamous. 



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



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

 Stamens only 2 with anthers ; ovary 4-lobed. . Lycopus, in LABIAT^E, 408 

 Stamens 2, rarely 3 ; ovary 2-celled. 



Low herbs ; corolla scarious, withering on the pod. PLANTAGINACEJE, 422 



Herbs ; corolla rotate, or somewhat funnelform, and 



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 ARISTOLOCHIACE^E, 444 



Four-celled; stamens 4 Ludwigia, in ONAGRACE.E, 18' 



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.E, 444 



