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 CONVOLVULACE^E, 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. . 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.E, 384 

 Leaves toothed, lobed or pinnately compound. HYDROPHYLLACE^;, 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.E, 391 



Leaves when opposite without stipules. 



Stamens free from the corolla or nearly so : style 1. ERICACE^, 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^, 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 HYDROPHYLLAGEJE, 367 



Style single SOLANACE.E, 380 



-- *- 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 LABIATE, 342 

 Stamens 2, rarely 3 : ovary 2-celled. 



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



Herbs : corolla rotate, or somewhat funnelform, and 



slightly irregular. . . . Veronica, in SCROPHULARIACE^E, 324 



Shrubs or trees, : corolla perfectly regular. . . . OLEACE^J, 400 



