KEY, 173 



367. Stamens exserted. Flowers in forked scorpoid 

 racemes. Calyx naked, or with minute appendages at the 

 sinuses. Leaves large, either pinnately parted into 5-13 

 divisions, or palmately 5- to V-lobed. Hydrophyllum. 



Stamens included. Flowers solitary, opposite the 

 leaves. Leaves parted into 3 to 5 wedge-obovate, sparingly 

 toothed segments. 



Nemophila microcalyx, Fisch & Meyer. 



368. Flowers in 1-sided racemes. Leaves pinnately 

 parted into 3-9 divisions. Filaments exserted. Flowers 

 bhie, purple, or white 369 



Flowers solitary. Calyx triangular, and in fruit 

 much enlarged. Stamens included. Leaves pinnately parted 

 into 7-13 lanceolate or linear-oblong, cut-toothed divisions. 

 Peduncles 1 -flowered, in the forks, or opposite the leaves. 

 Corolla whitish. Ellisia Nyctelea, L. 



369. Lobes of the corolla fringed. Cosmanthus, Xolte. 



(Phacelia^ Juss.) 

 Lobes of the corolla entire. Phacelia. 



370. A central free jDlacenta 371 



Two parietal placentae 374 



37 1 . Pod opening by valves or teeth 372 



Pod opening by a circumscissile line, the top fall- 

 ing off, like a lid. Corolla longer than the calyx, 5-parted, 

 with almost no tube, scarlet, purple, blue, or wliite. Petals 

 fringed with minute teeth. Filaments bearded. Leaves 

 ovate, sessile, shorter than the axillary solitary peduncles. 

 A low, procumbent annual. Anagallis arvensis, L. 



37^. Corolla mostly 7- (5-12-) parted, almost polypeta- 

 lous. Filaments united in a ring at the base ; anthers revo- 

 lute after flowering. Stem with a whorl of lanceolate leaves 

 at the summit. Alternate scales on the stem. Peduncles one 

 or more, very slender, bearing a star-like, white flower. 



(137) Trientalis Americana, Pursh. 



Corolla 5 or 6-parted 373 



