ANALYTICAL KEY. 27 



* # * Corolla regular. 



■t- Stamens as many as the lobes of the corolla. 



Ovaries 2, separate ; their 



Styles and stigmas also wholly separate. Dichondra, in Convolvulace.e, 374 

 Stigmas and sometimes styles united into one. 

 Filaments distinct : pollen in ordinary grains. . . Apocyxace.e, 392 

 Filaments monadelphous : pollen in masses. . . Asclepiadace^e, 394 

 Ovary one, but deeply 4-lobed around the style. 



Leaves alternate. Borragistace.e, 360 



Leaves opposite Mentha, in Labiat.e, 341 



Ovary one : pod 2-lobed or 2-horned at the summit. . Loganiace.e, 391 

 Ovary one, not divided nor deeply lobed, 



One-celled, with ovules parietal or on 2 parietal placenta?. 

 Leaves (or in Menyanthes three leaflets) entire. . Gentianace.e, 384 

 Leaves toothed, lobed or pinnately compound. Hydrophyllace^e, 367 

 Two- to ten-celled. 



Leafless parasitic twining plants. Quscuta, in Convolvulace.e, 374 



Leaves opposite, their bases or petioles connected 



by stipules or a stipular line .... Loganiace.e, 391 

 Leaves when opposite without stipules. 



Stamens free from the corolla or nearly so : style 1. Ericace.e, 286 



Stamens almost free from the corolla : style none. Aquifoliace^e, 305 



Stamens inserted on the tube of the corolla, 



Four : pod 2-celled, circumcissile. . . Plantaginace.e, 310 



Four : ovary 2 - 4-celled : ovules solitary. . Verbenace^e, 339 



Five or rarely more. 



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

 Fruit a few-seeded pod. 



Style 3-cleft : seeds small. . . . Polemoniace^:, 370 

 Style single or 2-cleft, or again 2-cleft : seeds 



large, only one or two in a cell. . Costvolvulaceje, 374 

 Fruit a very many-seeded pod or berry. 



Styles 2. Hydrolea, in Hydrophyllaceje, 367 

 Style single Solanace.e, 380 



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



Stamens 4, didynamous. 



Ovary 2-celled ; the cells several-seeded. . . . Acanthace^e, 338 



Ovary 2 -4-celled; the cells 1 -seeded. . . . Verbenace.e, 339 

 Stamens only 2 with anthers : ovary 4-lobed. . Lycopus, in Labiat.e, 342 

 Stamens 2, rarely 3 : ovary 2-celled. 



Low herbs : corolla scarious, withering on the pod. Plantaginacejs, 310 



Herbs : corolla rotate, or somewhat funnelform, and 



slightly irregular. . . . Veronica, in Scrophulariace.e, 324 



Shrubs or trees : corolla perfectly regular Oleace.e, 400 



