KEY. 185 



4S4. (321.) I. Stamens 10, distinct. Upper lip of the 

 corolla 3-lobed, or cleft, lower 2-parted or of 2 distinct pe- 

 tals. Style slender, declined. Flowers rose-purple, 3-5, 

 sessile in terminal clusters. A low shrub, 2-3 feet high. 

 Leaves obovate-oblong, downy-canescent beneath, rather 

 later than the flowers. Rhodora Canadensis, L. 



II. Stamens 2, 4, or 5, distinct 437 



III. Stamens 6, 8, or 10, monadelphous, or united 

 in 2 bundles 435 



435. Corolla 1- or 2-spurred, or saccate at the base. 

 Stamens 6, their filaments united into 2 bundles (apparently 



2 broad filaments, each bearing 3, stalked anthers) 221 



Corolla not spurred, nor saccate at the base 436 



4S6. Calyx of 5 sepals, the 3 outer ones smaller. Petals 

 3, placed between the 2 inner, larger sepals, connected with 

 each other and the split tube of the 6-8 stamens, the 



middle one boat-shaped and often crested 228 



Calyx tubular, 5-toothed. Corolla papilionaceous, 

 the claws of the petals partly united with one another and 

 with the filaments. Leaves trifoliolate. Trifolium (256). 



437. I. Stamens, fertile ones, 2 438 



II. Stamens, fertile ones, 3, and a fourth sterile, or 



even 2 sterile ones, see 328 and 450. 



III. Stamens 4 (fertile) 452 



IV. Stamens 5 (all perfect in Echium, see 377, or 

 one of them rudimentary in Martynia, see 450). 



438. Lower corolla-lip spurred. Pod 1-celled 439 



Lower corolla-lip not spurred 440 



439. Calyx 5-cleft, somewhat 2-lipped. Corolla 2-lipped ; 

 upper lip 2-, lower 3-lobed. Leaves simple, radical. Scape 

 1-flowered. In wet places, greasy to the touch. 



Pingnicula vulgaris, L. 

 Calyx of 2 sepals. Corolla personate, 2-lipped ; 

 upper lip bifid, lower longer. Aquatics. Leaves submersed, 

 dissected into capillary divisions, bearing little bladders. 



Utricularia. 



440. Ovary deeply 4-lobed, or 4 nutlets at the bottom of 

 the calyx. Stems usually 4-angled 441 



Ovary entire 446 



