1 72 PATAGONIAN EXPEDITIONS '. BOTANY. 



surpassing the flower, i-3-nerved, hyaline. Flower sublanceolate, sub- 

 glabrous ; crown largish, ciliate-edged. Callus villous. Awn persistent, 

 7 times as long as the flower. 



N. Patagon., by Rio Colorado, near Fort Mercedes. 



6. S. GYNERIOIDES Phil. 



Glumes narrow-linear, twice as long as the flower, exceeding the pap- 

 pus, i-3-nerved, subhyaline. Flower fusoid, pubescent, apically crowned 

 with pappus-villi of its own length. Callus half as long as the floral 

 diameter, villous. Awn subpersistent, 3-5 lengths of the flower. Culms 

 25-90 cm., about equalling the setaceous,- scabrid leaves. Panicle narrow, 

 scarcely secund. 



N. Patagon., Argent., over all the pampas by Rio Negro, and on the 

 hills. 



7. S. HUMILIS Vahl. 



Root fibrous. Culm cespitose, 10-15 cm. high, slender, glabrous. 

 Upper sheath ventricose, sheathing the short, spicate (25 mm.) panicle. 

 Rays short, glabrous. Glumes acute, one third longer than the 4-6 mm. 

 flower. Awn nude and straight at base, above with white hairs, feathery 

 to their joint, thereafter nude and straight again. 



S. Patagon., by R. Sta. Cruz. 



S. HUMULIS INTERMEDIA O. KtZC. 



Awn with a few hairs on the lower third. Leaves straight. 

 Patagon. 



S. HUMILIS DECRESCENS O. Ktze. 



Awn with many short hairs at its base. A pilose and also a subglabrous 

 form. 



(Argentina) ; Patagon. 



8. S. (PAPPOPHORA) IBARI Phil. 



Densely cespitose and rigid, with pilose convolute-setaceous leaves. 

 Culm twice as high as the radical leaves, involucrate to the panicle. Nodes 

 white-woolly with deflexed hairs. Glumes 17 mm. long, subequal ; the 

 flower without hairs at its base. Floral glume 7 mm. long, pilose, awn 

 25 mm. long and long-pilose below its angle. 



At Lake Pinto, S. Patagon. 



