Family POLYGONACEA# 89 
4, Polygonum pennsylvanicum L. 
A common and widely distributed weed. Some of the specimens 
placed here may belong to the next species. Franklin; Indianola; 
Kennedy; Lincoln; Mullen; Omaha; Paddock. 
5. Polygonum longistylum Small. 
A very common weed which was long confused wath the last. They 
seem to be almost identical except for the dimorphic flowers. Our 
specimens do not show black stigmas or lilac flowers, as given in 
the original description. Kearney; Lincoln; Omaha; Papillion; 
Rising City. 
6. Polygonum persicaria L. 
Common in the eastern part of the state. Bassett; Callaway; Lin- 
coln; Paddock; Valentine; Weeping Water. 
7. Polygonum persicaricides H. B. K. 
Over most of the state, but not common. Newark; Thedford. 
8. Polygonum hydropiperoides Michx. Mild Water-pepper. 
In wet soil, not very common. Ainsworth; Atkinson; Callaway. 
9. Polygonum hydropiper L. Common Smartweed. 
In eastern part of the state. Callaway; Franklin; Grand Rapids; 
Lincoln; Nemaha; Weeping Water. 
10. Polygonum punctatum Ell. 
Common in the eastern half of the state. Banner county; Grand 
Island; Grant county; Hooker county; Indianola; Lincoln; Thomas 
county; Wahoo. 
11. Polygonum virginianum L. 
Common in the southeastern part of the state. Endicott; Lincoln; 
Nebraska City; Nemaha; Richardson county. 
12. Polygonum aviculare L. Knot-grass, Door-weed. 
A common weed all over the state. Callaway; Fort Robinson; 
Grand Island; Kearney; Lincoln; Mullen; Pine Ridge; Talmage; 
Thedford. 
13. Polygonum buxiforme Small. 
Common all over the state. Alliance; Cheyenne county; Hooker 
county; Mullen. 
14. Polygonum erectum Roth. 
Common in the eastern part of the state. Ewing; Fort Robinson; 
Lincoln; Talmage. 
15. Polygonum ramosissimum Michx. 
Common throughout the state. Anselmo; Hooker county; Lancaster 
county; Laurel; Mullen; Rock county; Red Cloud. 
16. Polygonum prolificum (Small) Robinson. 
Nebraska, according to Britton and Brown. 
17. Polygonum exsertum Small. 
Valentine. 
18. Polygonum tenue Michx. 
In the western part of the state. Atkinson; Anselmo; Franklin; 
Lincoln; Valentine. 
19. Polygonum douglassii Greene. 
On Lawrence Fork in Banner county. 
20. Polygonum convolvulus L. Bindweed. 
Common in fields and waste places all over the state. Anselmo; 
