252 Plants Collected in Paraguay. 



rough on the margins, tapering to an acuminate point; involucels 

 narrower, about one-half as long. Sheaths of the rays about 3 cm. 

 long, reddish at the apex, obliquely fissured. The spikes are almost 

 buried out of sight among the bracts, which look like a broom. 



The two numbers referred to this may represent different species, 

 and I am uncertain whether either of them is the true C. giganteua, 

 Rottb. 



Cyperiis Haspan, L., Sp. PL, QQ. 



Yilla Rica (580); Luque (297 a). December-January. 



Cyperus Jenmani, C. B. Clarke, ined. 



Pilcomayo River (1069). January-April. = Spruce 6418. 

 Named by C. B. Clarke. 



An elegant species with slender, glabrous, triquetrous stems 4^-6 

 dm. high, many from the same root. Flowers straws-colored, in 

 compound umbels. Spikes 5-18 in a cluster, flat, 1-2 cm. long, 

 sessile or on rays 2-10 cm, long and raylets 4-5 mm. long, 10-30 

 flowers in a spike. Involucral bracts not sheathing, narrow, rough 

 on the margins, tapering to a long acuminate point, 1 or 2 of them 

 much longer than the flowers, in some cases nearly half as long as 

 the stems. 



This very strongly resembles C. Gapitinduensis, Maury, 1. c, 129, 

 t. 38. 



Cyperus l<uzulae, Rottb., Gram., i, t. 13, f. 2. 



Asuncion (244). December. Collected also at Cordoba by Hie- 

 ronymus. 



Cyperus nodosus, Willd., Enum., i, 72. 



Asuncion (364). December-January. 



Stem slender, rather weak, obscurely triquetrous, glabrous, with 

 2 or 3 short sheathing leaves near the base, 6-6J dm. high, from a 

 hard tuberous rootstock. Flowers in loose simple umbels, the rays 

 filiform, unequal, 1-4 cm. long. Spikes 3-7, linear, unequal, 1-2J 

 cm. long, 10-30 flowered. Fruit chestnut-colored. 



Cyperus Olfersianus, Kunth., Enum., ii, 10. 

 Asuncion (86 and 567). November. 



