286 PATAGONIAN EXPEDITIONS I BOTANY. 



having 5-6 ovate spikes, which are male at the base. Utricles plano- 

 convex, ovate, with sharp denticulate angles. Scales shorter, ovate- 

 oblong; rostrum acute, 2-toothed. 



(Equat. Andes; Chili; Argent); Patagon., Rio Sta. Cruz; Magellan; 

 S. Fuegia. 



32. C. PSEUDOCYPERUS Linn. 



Tristylous. Terminal male spike solitary, and 3-6 dense cylindrical 

 female spikes drooping on long pedicels. Culms 60-90 cm. high, acute- 

 angled, glabrous, rough on the angles, at least above. Leaves nodulose, 

 5-10 mm. broad. Bracts leafy; the lowermost sometimes sheathing the 

 others without sheaths. Scales setaceous, scabrous. 



Fruit oblong, very acuminate, ribbed. Rostrum bifid. 



(Old World.) Patagonia; common in swamps near Rio Chubut ; by 

 Lago Nahuel-huapi. 



33. C. RIPARIA Curtis. 



Style 3-cleft. Root thick, creeping. Culm about i meter tall, acutely 

 trigonal, rough-edged. Leaves plane, broad, rough-edged, acuminate. 

 Bracts leafy, exceeding the culm, their sheaths short. Male spikes 3-5, at 

 top ; about as many female spikes below, cylindrical, sometimes male 

 apically. Utricle ovate, tapering to a short 2-toothed rostrum. Scale 

 shorter, ovate-oblong, awned. 



(Eur. and N. Am. Brit. & Br. i, 303) ; " common along water courses 

 in N. Patagon. to Buenos Ayres" (J. Ball). The form incrassata, has 

 very long leaves, male spikes, a large terminal surrounded by small ones ; 

 the scale having 7 confluent whitish nerves with interposed furrows on 

 the lower surface. 



C. RIPARIA CHI*LENSIS Brongn. 



Leaves very long, linear. Male spike solitary; female spikes ovate- 

 oblong. Scales lanceolate-subulate, longer than their utricles. 

 . N. Patagon., mouth of Rio Chubut. (Dusn.) 



34. C. SCHEDONAUTOS Steud. 



Style 2-cleft. Culm to 60 cm. tall, erect, trigonal, glabrous, with loose 

 leafless sheaths below, leafy above. Culm leaves plane, narrow-lanceolate, 

 rough-edged, with setaceous apex; sometimes exceeding the culm. 

 Spike-like crowd of alternate glomerules, 25 mm. long ; male and andro- 



