« Clusters usually crowded or dense, 
, 3-6 cme long, usually 1.5 om. or 
“more broad at the base, the p rigynia 
tending to spread, thus giving a 
ragged bristling appearance to the 
. cluster. (C. tribuloides may be sought 
(2 \ here; it be distinguished by the 
. persist non=jointed style which is 
\ than the achene and by the achene 
_\atfich is nearly twice as long as broad ) 
we 
"lo Teaf-blades prevailingly 3<5 mm. broads 
apn’ : ef perigynia 3-4 mn. long 
/ © Perigynia narrowly ovate, the beak 
sf as long as the body 7. Ce Cusickii 
/¥ Perigynia broadly ovate, the beak 
if half as long as the body 3, Go Vulpinoidea 
/O Yeaf-blades prevailingly 5-8 om. 
ij / droad$ <imledtborae}> perigynia 4-5 
 \ mms Longo( sia Herc a? 9,Ce stipata 
q 
« Clusters either crowded and dense, in 
jwhich case they are rarely more than 2.5 
/ ome long and less than 1.5 om. wide at the 
/ base or else loose and sometizes more 
\2,| @longated, the individual spikes ,which 
| are motly gall end globose being clearly 
separated, the lower often remote; perigynia 
tending to overlap in the denser clusters 
/¢ Sa Spikes crowded into dense terminal clusters 
/4 usually ovoid 
‘> Staminate flowers, when present in 
/a spike, borne at the tip of the 
j spike above the pistillate flowers, 
| recognizable in fruit by the other- 
C wise empty scales which contain only 
the threadlike filaments from which 
\ the anthers have fallen. 
/+ Flowers 3-4 or fewer in each spike P 
one or two being pistillate, the 
/[ perigynia rounded on both surfaces, 
/$\ strongly distended by the achane 
\ and almost beakless /0.C. disperma ~*~ 
\ 
iy Flowers several to many, the 
) perigynia flattened on one surface, 
)$<{ not markedly distended by tie . 
\achene, beaked. 
