ANALYTICAL KEY. 27 



# * * Corolla regular. 



-i- Stamens as many as the lobes of the corolla. 



Ovaries 2, separate ; their 



Styles and stigmas also wholly separate. Dichondra, in CoNVOLVULACEiE, 374 

 Stigmas and sometimes styles united into one. 

 Filaments distinct : pollen in ordinary grains. . . Apocynace^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 Labiate, 341 



Ovary one : pod 2-lobed or 2-horned at the summit. . Loganiacea;, 391 

 Ovary one, not divided nor deeply lobed, 



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



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. Cuscuta, in Convolvulacejs, 374 



Leaves opposite, their bases or petioles connected 



by stipules or a stipular line .... Loganiaceje, 391 

 Leaves when opposite without stipules. 



Stamens free from the corolla or nearly so : style 1. Ericaceae, 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^e, 370 

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



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

 Fruit a very many-seeded pod or berry. 



Styles 2. Hydrolea, in Hydrophyllace,e, 367 

 Style single Solanace^e, 380 



-t- +- 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^:, 339 

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

 Stamens 2, rarely 3 : ovary 2-celled. 



Low herbs : corolla scarious, withering on the pod. Plantaginace^e, 310 



Herbs : corolla rotate, or somewhat funnelform, and 



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



Shrubs or trees : corolla perfectly regular Oleaceje, 400 



