Family CYPERACEZA 29 
4. Scirpus occidentalis (Wats.) Chase. 
Kearney; Thedford. 
5. Scirpus paludosus A. Nels. Prairie Bulrush. 
Alliance; Kearney county; in Lone Tree lake near Kennedy; Laurel; 
Lincoln; Newark; St. James; Whitman. 
6. Scirpus fluviatilis (Torr.) A Gray. River Bulrush. 
In wet, marshy places over most of the state. Kennedy; Merriman. 
7. Scirpus atrovirens Muhl. 
Common in wet places. Beatrice; Lincoln; Minden; Nehawka; St. 
James; Weeping Water. 
8. Scirpus pallidus (Britton) Fernald. 
Cammon in marshy places. Broken Bow; Crawford; Hitchcock 
county; Hooker county; Nebraska City; Talmage; Thedford; Wahoo. 
7. Eriophorum. 180. 
Leaves 1.5 mm. wide or less; spike in fruit not over 2 em. long. 
; 1. E. gracile. 
Leaves 1.5-4 mm. wide; spike in fruit 2.5-4 mm. long. 
2. E. angustifolium. 
1. Eriophorum gracile Koch. Slender Cotton-sedge. 
In bogs in the sand-hill regions. Kennedy; Lavaca; Simeon; Thed- 
ford. 
2. Eriophorum angustifolium Roth. 
In bogs in the sand-hill region. Arabia; Kennedy. 
8. Dulichium. 166. 
1. Dulichium arundinaceum (L.) Britton. 
In wet soil, not common. Bone Creek valley; Endicott; Ewing; Ken- 
nedy. 
9. Cyperus. 159. 
Styles 2-cleft; achenes lenticular. 
Stamens usually 2, scales dull, styles long exserted. 1. C. diandrus. 
Stamens 3, scales shiny, styles scarcely exserted. 2. C. rivularis. 
Styles 3-cleft; achenes triangular. 
Annuals without corms or rootstocks. 
Stamen 1; umbels usually simple. 
Tips of the scales awnlike, spreading. 3. C. inflexus. 
Tips of the scales not prolonged into awns. 5. C. acuminatus. 
Stamens 3; umbels usually compound. 
Bracts of the involucre but little exceeding the umbel; scales 
not overlapping. 6. C. engelmanni. 
Bracts of the involucre much exceeding the umbel, flower 
scales overlapping. 
Wings of the rachilla separating as internal scales which 
persist after the flower scales have fallen off. 
. 8. C. erythrorhizos. 
Wings persistent, not forming internal scales. 
9. C. speciosus. 
Perennials with corms or rootstocks. 
With scaly tuber-bearing rootstocks. 7. C. esculentus. 
Without rootstocks, perennial by basal corms. 
Achene 3-4 times as long as wide. 10. C. strigosus. 
Achenes about twice as long as wide. 
