Plants Collected in Paraguay. 251 



CYPERACE^. 

 Cyperus Ijroiiioides, Link., Jahrb., iii, 85. 



Between Escoba and Caballero (416). January. 



Cyperus Balansae, Maury, Mem. Soc. Phys. Gen., xxxi, 130, t. 39. 



Named by C. B. Clarke. 



Central Paraguay (1560). 



Stout, 1 m. high; stems triquetrous, glabrous. Umbels simple. 

 Heads sessile or on rays 2-7 cm. long. A tall, conspicuous marsh 

 sedge. 



Cyperus cinereus, Maury, 1. c, 127, t. 361. 

 Caballero (433). January. 



Cyperus Concepcionis, Steud., Syn. PL Glum., pt. 2, 42. 

 Caballero (565). January. Named by C. B. Clarke. 



Cyperus elegans, L., Sp. PL, 68. 



Luque (29t b). December. 



Cyperus esculentus, L., Sp. PL, 67. 



Gran Chaco (1561). October. 

 Common in wet cultivated fields. 



Cyperus flavus (VahL), BoeckL, Linnsea, xxxvi, 384. 



Asuncion (128); Caballero (123 b); Yilla Rica (578). January. 



Cyperus ferax, Rich., Act. Soc. Hist. Nat. Par., i, 106. 

 Asuncion (243). December. 



Cyperus giganteus, Rottb., Gram., 38? 



Asuncion (353 and 562). December. 



A very conspicuous species wuth stout, terete, leafless stems 2-3 

 m. in height. Flowers in a dense, compound, leafy head at the 

 summit of the stem, 3 or 4 dm. high, spreading as widely. Primary 

 rays 40-50 or more, 10-20 cm. long, triquetrous, glabrous, the 

 secondary 1-2 cm. in length. Spikes narrow, flat, 2-3 cm. long, 

 and 5 mm. wide, 3 or 4 small flowers in a spikelet, all much over- 

 topped by the long acuminate, erect bracts. Involucral bracts 5-15 

 mm. broad at the base, not sheathing, erect, 3-3 J dm. long, striate, 



