KEY. 169 



340. (330.) Lobes of the corolla all turned forward. 

 Filaments capillary, curved,very long, exserted much beyond 

 the corolla. Flowers bluish. Peduncles usually 1 -flowered. 

 Leaves linear or lance-oblong. Trichostema. 



Lobes almost equally spreading. Stamens nearly 

 included. Peduncles 1- to 3-flowered. Flowers pale blue. 

 Leaves lance-oblong, 3-nerved. Isanthus cseruleus, Mx. 



341, (322.) Stamens 4 342 



Stamens 5 or more 355 



34^. Ovary entire 343 



Ovary deeply 4-lobed, forming 4 achenia in fruit. 

 Corolla short-bell-shaped, 4-cleft; upper lobe broadest. 

 Odorous herbs. Flowers small, pale purple or whitish, in 

 axillary capitate whorls. Mentha. 



343. Leafless herbs 344 



Herbs with leaves 345 



344. Twining around other plants. Calyx 4- or S-cleft. 

 Corolla globular-urn-shaped, or campanulate, or funnel-form. 

 Stamens 4, or 5. Flowers cymose-clustered. Cuscuta (392). 



Not twining. Root-parasites, slender, much- 

 branched, purplish, or yellowish-brown, 6-12 inches high. 



329 



34^. L Ovary 1-celled. Herbaceous j^lants 347 



n. Ovary 2-celled 354 



HI. Ovary 4-celled. Fruit a drupe, with 4 nutlets. 

 Shrubs 34G 



346. Style 1. Calyx 5- (or 4-) toothed 339 



Styles 4 130 



347. Apparent calyx consisting of 3 bractlets under the 

 ovary. Apparent corolla-tube (the real calyx) coherent witli 

 the ovary. Flowers in cylindrical, terminal spikes. Leaves 

 alternate, i^innate VOO 



Ovary free in the corolla. Leaves entire 348 



348. Leaves opposite, or rarely whorled. Ovary with 2 

 parietal placentae 349 



Leaves alternate. Ovary with a central placenta. 



