80 GERANIALES 
17. Polygonum prolificum Small. 
Nebraska according to Britton’s Manual. 
18. Polygonum ramosissimum Michx. 
Common throughout the state. Anselmo; Hooker County; Lancaster 
County; Laurel; Mullen; Rock County; Red Cloud; Whitman. 
19. Polygonum camporum Meisn. 
In prairies throughout the state.~ Cody; Franklin; Hooker County; 
Lincoln; Mullen, 
20. Polygonum exsertum Small. 
Valentine. 
21. Polygonum tenue Michx. 
In the eastern part of the state. Atkinson; Anselmo; Franklin; Lin- 
coln; Valentine. 
22. Polygonum douglassii Greene. 
On Lawrence Fork in Banner County. 
23. Polygonum convolvulus L. Bindweed. 
Common in fields and waste places all over the state. Anselmo; Fair- 
bury; Hat Creek Basin; Hooker County; Kimball County; Lincoln; 
Long Pine; Talmage; Thedford. 
24. Polygonum scandens L, 
Common in woods mostly along streams. Arapahoe; Banner County; 
Deuel County; Keya Paha County; Lancaster County; Long Pine. 
25. Polygonum sagittatum L. 
Endicott; Paddock; Thedford. 
GERANIALES. 
Trees with pinnate or trifoliate leaves. 6. Rutaceae. 
Herbs, leaves various. 
Leaves trifoliate, leaflets obcordate. 2. Oxalidaceae. 
Leaves cleft into numerous narrow lobes. | 1. Geraniaceae. 
Leaves neither trifoliate nor cleft into numerous narrow lobes. 
Leaves pinnate, 5. Zygophyllaceae. 
Leaves simple. 
Flowers with one sepal spurred. 3. Balsaminaceae. 
Flowers without spurs. 
Flowers irregular, stamens 8, united into 1 or 2 sets. 
2. Polygalaceae. 
Flowers regular often much reduced. 
Ovary round 4-10 celled. 4. Linaceae. 
Ovary three-lobed or flattened, 3-4 celled. 
Ovary three lobed, three celled, styles three, 
8. Euphorbiaceae. 
Ovary flattened, 4 celled, styles two , 9. Callitricaceae. 
1. GERANIACEAE. 
Leaves digitately divided or lobed as wide as long. 1. Geranium. 
Leaves pinnately divided, much longer than wide. 2. Erodium. 
1. Geranium. 573, 
Flowers 25 mm. broad and more, 1. G. maculatum. 
Flowers 10-12 mm, broad, 
