80 



GERAXIALES 



17. Polygonum prolificum Small. 

 Nebraska according to Britton's :\Ianual. 



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 

 coin; Valentine. 



22. Polygonum douglassii Greene. 

 On Lawrence Fork in Banner County. 



23. Polygonum convolvulus L. 



Common in fields and waste places all over the state 

 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. 



Atkinson; Anselmo; Franklin; Lin- 



Bindweed. 

 Anselmo; Fair- 



GERANIALES. 



Trees with pinnate or trifoliate leaves. 

 Herbs, leaves various. 



Leaves trifoliate, leaflets obcordate. 

 Leaves cleft into numerous narrow lobes. 

 Leaves neither trifoliate nor cleft into numerous 

 Leaves pinnate. 

 Leaves simple. 



Flowers with on sepal spurred. 

 Flowers without spurs. 



Flowers irregular, stamens 8. united into 1 



Flowers regular often much reduced. 

 Ovary round 4-10 celled. 

 Ovary three-lobed or flattened, 3-4 celled. 

 Ovary three lobed, three celled, styles 



Ovary flattened, 4 celled, styles two . 



1. GERANIACEAE. 



Leaves digitately divided or lobed as wide as long. 

 Leaves pinnately divided, much longer than wide. 



6. Rutaceae. 



2. Oxalidaceae. 



1, Geraniaceae. 

 narrow lobes. 

 5. Zygophyllaceae. 



3. Balsaminaceae. 



or 2 sets. 

 2. Polygalaceae. 



4. LInaceae. 



three. 



8. Euphorbiaceae. 

 9. Callitricaceae. 



1. Geranium. 

 2. Erodium. 



1. Geranium. 357. 

 Flowers 25 mm. broad and more. 

 Flowers 10-12 mm. broad. 



1. G. maculatum. 



