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. . . Apoctsace.e, 392 

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

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



Leaves alternate. Borraginace.e, 360 



Leaves opposite Mentha, in LABiATiE, 341 



Ovary one : pod 2-lobed or 2-homed at the summit. . Loganiace^, 391 

 Ovary one, not divided nor deeply lobed, 

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

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

 Leaves toothed, lobed or pinnately compound. HYDROPHYLLACEiE, 367 

 Two- to ten-celled. 

 Leafless parasitic twining plants. Cuscuta, in Convolvulace^, 374 



Leaves opposite, their bases or petioles connected 



by stipules or a stipular line .... Loganiace.s}, 391 

 Leaves when opposite without stipules. 



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



Stamens almost free from the corolla : style none. AQniFOLiACE.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^, 339 

 Five or rarely more. 

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

 Fruit a few-seeded pod. 



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

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



large, only one or two in a cell. . Convolvulace^, 374 

 Fruit a very many-seeded pod or berry. 



Styles 2. . . . Hydrolea, in Htdkophyllace^, 367 

 Style single Solanace.s), 380 



H- -1- Stamens fewer than the hies of the corolla. 



Stamens 4, didynamous. 



Ovary 2-celled ; the cells several-seeded. . . . Acakthace^, 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 ssarious, withering on the pod. PLANTAGiNACEiE, 310 



Herbs : corolla rotate, or somewhat funnelform, and 



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



Shrubs or trees : corolla perfectly regular Oleace^, 400 



