224 PATAGONIAN EXPEDITIONS I BOTANY. 



3. P. ARGENTINA Speg. 



Dioecious, perennial, 50-70 cm. tall, glabrous, cespitose. Leaves erect, 

 convolute, acute. Ligule narrow, margin-like. Panicle spiciform, strict- 

 Spikelets 5-7 mm. long, pediceled, 7-8-flowered, not villous. Glumes 

 appressed-pubescent. 



S. Patagon., at Lago Argentine. 



4. P. ATROPIDIFORMIS Hack. 



Cespitose, with intravaginal innovations. Culms erect, 10-20 cm. high, 

 smooth, 2-nodal near base. Leaves glabrous, their sheaths lax, striate ; 

 ligules 2 mm. long, ovate-lanceolate, the blades short, the uppermost i cm., 

 narrow, convolute when dry. Panicle spike-like, 5-8 cm. long ; lower rays 

 with 4-6 spikelets, fewer above ; spikelets 3-flowered, all perfect, glabrous, 

 third flower protruding. Glumes all subequal, keel scabrid, except the floral 

 glume whose keel is rather smooth and its lateral nerves obscure. Palea 

 lanceolate, obtuse, as long as the glume. 



E. Fuegia. (Dusen.) "This and P. kerguelensis Hook. f. and Triodia 

 antarctica Hook. f. are allied as if they were a subgenus of Poa." (E. 

 Hackel.) 



5. P. BERGII Hieron. 



Dioecious. Stout, culms 50 cm. high, smooth, rooting at base. Leaves 

 exceeding the culms, their sheaths 20-25 cm. long, 7 mm. broad, smooth, 

 lamina 35-45 cm. long, convolute from their base, glaucous, rigid, acute, 

 Pungent, 4 mm. wide at base, dorsally glabrous, internally papillose ; 

 ligules long, hyaline, mostly lacerose. Male panicle compressed, spike-like, 

 interrupted, 12 cm. long, the rays usually in 2's alternately appressed to 

 the culm, pediceled and plurispiculate. Female spikes ovate, 6-7-flowered, 

 pediceled, about 15 mm. long, 6 mm. broad. Glumes lanceolate, 8-9 

 mm. long, 3 mm. broad, acute, not exceeding the inferior flowers, sub- 

 carinate, dorsally rough on the midnerve, minutely ciliolate marginally, 

 7-nerved, the 2 marginal nerves being weaker and shorter than the others. 

 Floral glumes 7~9-nerved, lance-ovate, acute, in the lower flowers 7 mm. 

 by 2 mm., subcarinate baseward and finely ciliate on the nerves, with a 

 basal girdle of floccose wool. Palece with 2 marginal nerves, ciliate up- 

 wards, woolly basewards. Male spikelets (?). 



N. Patagon., by Rio Negro ; December. 



