General Key to the Families 25 



2. H. sulphurescens. Rydb. White Hedysarmn. 



3. H. Mackenzii. Richards, Mackenzie's Hedysarum. 

 VIII. ViciA. Tourn. 



1. V. Cracca. L. Cozu Vetch. (Introduced.) 



2. V. americana. Muhl. American Vetch. 

 IX. Lathyrus. L. 



1. L. ochroleucus. Hook. White Vetchling. 



2. L. palustris. L. Marsh Vetchling. 



ORDER XXII. GERANIALES 

 XXXIX. LINAGES. FLAX FAMILY 



Herbs or more rarely low shrubs ; leaves simple, entire, sessile, 

 alternate, opposite or subverticillate below; flowers cymose, her- 

 maphrodite, regular, symmetrical, hypogynous, the calyx strongly 

 imbricated, petals convolute in the bud; fruit a many-seeded pod, 

 having twice as many cells as there are styles, seeds oily. 



I. LiNUM. (Tourn.) L. 



I. L. Lewisii. Pursh. Wild Flax. 



XL. GERANIACE^. GERANIUM FAMILY 



Plants with astringent roots; leaves toothed, lobed or divided, 

 stipulate; flowers hypogynous, perfect, regular, numerous, sepals 

 imbricated in the bud, persistent; fruit ovary deeply lobed, carpels 

 two-ovuled, one-seeded, separating elastically with their long styles 

 when mature from the elongated axis. 



I, Geranium. (Tourn.) L. 



1. G. Richardsonii. F. and M. White Geranium. 



2. G. carolinianum. L. Carolina Crane's Bill. 



3. G. Bicknellii. Britton. Bicknell's Geranium. 



XLL CALLITRICHACE^. WATER STARWORT FAMILY 



Chiefly aquatic herbs, low, slender, usually tufted; leaves entire, 

 spatulate or linear; flowers monoecious, solitary or a few together 

 in the axil of the leaf, wholly naked or enclosed by a pair of 



