sf Spikes 6-8 mn. thick; scales 4.5<5 mn. long, ~ 
/$ lanceolate 34. Ce nebraskensis; a 
/t{ Spikes 3<5 mne thick; scales 1.5-2.5 m. long 
‘ Scales 1.2-1.5 mn, wide, nearly as broad 
as the perigynia, their rather broad 
20% sadet Opaque white 3S. Co aquatilis 
/G Seales rarely 1 mm. wide, clearly narrower 
5 { than the p rigynia, their margins little 
L° \ or not at all white 
/¢ Perigynia abruptly gathered at the base 
to a short stalk,the body of the 
v1.( pertain elliptical, about half as 
road as long; spikes 4<5 mm. thick 
/& Perigynia subsessile, the broadly 
‘ sie or oval, about 2/3 as broad 
1>< as long; Spikes 3.5-4 mm, thick 
side of the oulms of the 
ik Surrounded at the base by 
vear 
