se 
/Z Freely stoloniferous, nok tufted, scales light 
/> brown, covering the glaucous perigynia 47. Ce limosa 
| 2. Tufted, the scales deep purple, the perigynia 
,, (parple or brown, or if green,the mature 
iG | perigynia twice as long as the scales thtratee). 
)4 Perigynia green, twice as long as the scales, the 
/§ spikes 8-10 mn. thick 418. Co Mertensi 4 
/4 Perigynia brown or purple, longer than the 
% scales; spikes 4-6 mn. thick 
/6 Terminal spikes wholly staminate 49. Cs Montanensis _/,) 
/(, Terminal spikes mixed, the upper ones 
20 pistillate yo. Co atratif raig 
( 7b. Style continuous with the achene, hardened and persistent 
70 in fruit 
4 Perigynia coarsely ribbed with 8-10 veins; mature spikes 
‘2, ascending, subsessile or the lowermost stalked (Phypsccarpar} 
}o Lower perigynia not reflexed 
) A Perigynia ascending; sheaths of lower leaves breaking 
into fibrils where they split; rootstocks short with 
/(,( short ascending stolons deawee—net_conspicucusly 
‘6 \ : 4 
\ 
/+ Perigynia 6-8 mn. long, abruptly cantracted into 
ig the beak SL, Co vesicaria } 
|¢ Perigynia 8-10 mm. long, tapering into the beak 53,0. exsiogata 
/% Perigynia spreading; sheaths of lower leaves not 
breaking into Pibrils; rootstocks sending out 
| & \ long horizantal stolonsy leeaves—consptouursty 
\evessareined X4.Ce rostrata 
0 Lower perigynia reflexed Sy|. Ce retrorsa ) 
4 Perigynia finelv ribbed with 12-15 veins; mature spikes 
/z drooping, stalked x S. Ce comosa 
ee 
Sas 
