54 PATAGONIAN EXPEDITIONS : BOTANY. 



and exterminating the native vegetation. Is found also in the Falkland 

 Is., and in South Georgia. Is marked by Skottsberg as cosmopolitan. 



POA ANTARCTICA (d'Urv.) Pilger. 



Syn. Arundo antarctica d'Urv. Festuca antarctica Kunth. 



Poa rigidifolia Steud. 



Root fibrous, cespitiferous ; culms with enlarged basal sheaths enclosed 

 in persistent remains of leaves ; ligules long hyaline ; old and fresh leaves 

 convolute, terete, rigid, pungent, as high as the culms. Interrupted 

 spike-like panicle 8 cm.; spikelets lanceolate, 2-flowered, with hairs at their 

 base. Glumes nearly as long as the flowers, acute, apex rough. 



Falkland Is.; N. Fuegia. D. 



P. CENISIA All. 



Root stoloniferous. Culm (30 cm.) and sheaths glabrous: highest 

 sheath much exceeding its leaf. Ligules short, the higher ovate ; leaves 

 lanceolate, plane, acute. Panicle spreading, peduncles in 2's, rarely 5's; 

 spikelets ovoid, 3-5-flowered ; flowers hairy dorsally and marginally, 5- 

 nerved, with wool. 



European Alps, and Arctic. S. Fuegia in the alpine region near 

 Ushuaia. 



The Fuegian form of this species differs from that found in the 

 European Alps by the greater laxness of the innovation-leaves, the longer 

 ligule and the more obtuse floral glumes, and mostly larger spikelets. 

 (Skottsberg.) 



P. CHONOTICA Phil. 



Dioecious perennial ; culm 30-60 cm., leafy to midway ; leaves compli- 

 cate, subfalcate, smooth except margin ; radical leaves strict, erect, with 

 white sheaths, shining, sometimes over 12 cm. long, 8 mm. broad; ligule 

 short, truncate, lacerate. Panicle erect, oblong, 1 2 cm.> its branches in 3's 

 or 2's. Spikelets 7 mm. long, 2-3-flowered: pales narrowing upwardly, 

 from broad base. 



Chili, Fuegia. 



P. DENUDATA Steud. and P. DENUDATA MINOR. Mad., p. 226. 



Should be deleted. They do not occur in our district. 



