1 74 PATAGONIAN EXPEDITIONS : BOTANY. 



secund, smooth. Ghimes from a colored base, membranaceous-hyaline, 

 setaceous-attenuate, exceeding the short-stiped, lanceolate flower. Awn 

 10 times as long as the flower, slightly twisted at the base, pilose 

 upwards. 



(Argentina) ; Patagon., by Rio Sta. Cruz, and Rio Chubut. 



12. S. PAMPEANA Speg. 



Glumellce elliptic-lanceolate, 2-3 times longer than the flower, 3-nerved, 

 dark-purple. Flower oblanceolate or obovate, compressed, smooth and 

 shining ; on a callus which is rather long, and with long white villi sur- 

 mounting the flower. Crown small, subturbinate, with white villi. Awn 

 persistent, 10 times as long as the flower. Culms 25-45 cm., slender, 

 sometimes surpassing the smooth subulate-setaceous leaves. Panicle spi- 

 cate, depauperate. 



(S. Argentina) ; Patagon., Chubut, by Teka-choique. (Fig. 31, A}. 



13. S. PAPPOSA Nees. 1849. ($ jarava Beauv.) 



Glumes very narrow, small, about half as long as the flower, i-nerved, 

 hyaline. Flower linear-lanceolate, smooth, rough upwards, abruptly 

 crowned by villi of its own length. Callus 2-3 times as long as the 

 flower is broad, white-villous. Awn persistent, 3-5 times as long as the 

 flower. Culms simple, surpassing the smooth convolute-plane leaves. 

 Panicle diffuse, erect or nutant. 



N. Patagon., over the pampas from Rio Negro northwards through 

 Argentina. (Mex.) 



14. S. PATAGONICA Speg. 



Perennial, densely cespitose, 20-35 cm - high- Caudex often bearing 

 apical innovations. Culm fasciculately leafy, longer than the leaves. 

 Leaves convolute, terete-juncoid, rigid, acute-pungent, glabrous. Sheaths 

 glabrous, close-appressed, their margin ciliate-pectinate. Ligtiles narrow- 

 velvety ; a villous ring on outside at base of lamina. Panicle short, con- 

 tracted. Spikelets pediceled ; glumes hyaline, subequal, glabrous, twice 

 exceeding the appressed, silky floral glume, which is acutely callus- 

 pediceled. Awn geniculate, twice as long as its glume, white-villous 

 below the joint. 



S. Patagon., by Rivers Gallegos and Sta. Cruz. 



