172 PRACTICAL BOTANY. 



361. Stamens exserted; filaments short, united at the 

 base. Corolla reflexed, 5-parted. Leaves oblong-spatulate. 

 A simple, naked scape, bearing an ample umbel of purple, 

 rose-colored, showy, usually nodding flowers. 



Dodecatheon Meadia, L. 



Stamens included. Corolla salver-shaped, or funnel- 

 form 362 



369. Corolla open at the throat. The simple scapes 

 bearing an umbel of lilac or flesh-colored flowers. 



Primula. 



Corolla contracted at the throat, short. Flowers 

 small, white. Scapes 2-4 inches high, many-flowered. 



Androsace occidentalis, Pursh. 



363. Leaves all alternate, entire, or partly alternate and 

 palmately or })innately parted 364 



Leaves, opposite, or whorled and entire 370 



364. Leaves entire, and all alternate. Placenta free, 

 central 365 



Leaves lobed or parted. Two parietal placentae. 

 Ovary hairy, few- (rarely several-) seeded. Herbs pubescent. 



366 



365. Ovary half superior; calyx adherent to its base. 

 Corolla somewhat bell-shaped, with 5 sterile filaments in the 

 sinuses of the limb (besides the fertile). Pods opening by 5 

 valves. Flowers small, white, in simple or panicled racemes. 

 Leaves obovate. Bractlets on the middle of the slender 

 pedicels. Samolus Valerandi, L. (523) 



Ovary perfectly free. Corolla wheel-shaped, 5- 

 (or 4-) cleft. Pod opening by a circumscissile line, the top 

 falling away like a lid. (348) Centunculus minimus, L. 



366. Corolla-lobes convolute in the bud. Calyx con- 

 stantly, or often with a tooth or other appendage in each 

 sinus. Flowers white, or blue 367 



Corolla-lobes imbricate (quincuncial) in the bud. 

 Sinuses of the calyx naked. Flowers white, blue, or purple. 



368 



