MACLOSKIE : CYPERACE/E. 259 



lanceolate, acute,. sessile, i i-i5-flowered; scales ovate, obtuse, muticous, 

 carinate-navicular, dorsally 5-nerved, olivaceous, and croceous-punctulate, 

 the sides dark or sanguineous-castaneous ; keel green, shining. Achene 

 ovate-oblong, compressed, apicate, punctulate, half as long as the scale. 

 (Mexico); N. Patagon., in swamps near Carmen and Tres Cerros. 



5. C. POEPPIGII Knth. 



Ctdms cespitose, short (5 cm.) triangular, with leafy base. Leaves 

 plane, linear, scabrid on margin, exceeding the culm. Involucre 3-leaved, 

 long. Umbel simple, few-rayed, fasciculately crowded ; rays very short, 

 polystachyous ; spikelets on the rays arranged in compound spikes, linear, 

 compressed, flexuose, about 4-flowered. Scales remote, ovate-elliptical, 

 apically rounded, carinate, y-nerved, dorsally rusty-lined, laterally hyaline- 

 pale. Achenes oblong-linear, trigonal, slightly arcuate, mucronate, punc- 

 tulate, black-castaneous, shining, shorter than the scale. 



(Chili.) 



C. POEPPIGII PALLESCENS Kurtz. 



Pallid-green; the scales mostly i -colored. 



N. Patagon., in swamps near Carmen. Pale green plant. 



6. C. VEGETUS Willd. 



Culm 60-120 cm. tall, trigonal; leaves as long or longer. Umbel 

 i2-rayed; involucre 6-8-leaved, very long. Heads many-spiculate, sub- 

 globose. Spikelets 2O-4o-flowered ; scales a third shorter, ovate, acute, 

 3-nerved, areolate, green or yellowish. Stamen i. Achene obovate, 

 punctulate, shining brown, trigonal, mucronate, half as long as the glume. 



(Chili) ; Valley of Rio Negro, N. Patagon. (Roca Exp. and J. Ball.) 



3. SCIRPUS Linn. Bulrush. 



Large or small "sedges" with leafy culms or leafless except the basal 

 sheaths. Scales of the spikelets imbricated all round. Flowers usually 

 perfect; perianth of 6-1-0 bristles. Style not swollen at base. Achene 

 trigonal or lenticular. 



Species 200, cosmopolitan. 



KEY TO THE SPECIES. 

 A. Spike solitary. 



b. Culm short ; root creeping. Spike ovate, few-flowered. Scales ovate, rusty to straw- 

 white. Setae 6. Style trifid. albibracteatus. 



