1 68 PATAGONIAN EXPEDITIONS ; BOTANY. 



Species 10, most in S. Eur. ; some in N. Amer. 



P. ANGUSTA Nees. 



Root fibrous. Culm (45-90 cm. high) and sheaths glabrous ; the sheaths 

 half as long as the internode. Ligules obtuse. Leaves glabrous, the 

 upper 25 mm., the lower 7-10 cm. Thyrse 4-7 cm., linear. Glumes 

 3-nerved, subequally winged. Pedicels very short. Cartilaginous rudi- 

 ments 2, pilose at apex, with pilose horn. Flower hermaphrodite, 

 slightly shorter than the glumes, pilose. 



S. Patagon., in meadows along Carren-leofu. 



The Patagonia forms are stout, very green, with cylindraceous spikes, 

 spikelets sometimes partly violascent. (Speg.) 



14. ARISTIDA Linn. Three-awned grass. 



Culms branching and leaves narrow, often involute-setaceous. Panicle 

 spreading or contracted. Spikelets narrow, i -flowered. Glumes 3, i and 

 2 carinate, third ridged and convolute, 3-awned (or the lateral awns ob- 

 solete). Grain free, enclosed in the glume. 



Species 100, in warm countries. (Brit. & Br. i, 133.) 



i. A. DIFFUSA Trin. & Rupr. (A. laxa Cav.) 



Culms fasciculate, simple, 15-60 cm. tall. Leaves convolute, subulate, 

 sheaths striate, glabrous. Panicle lax, depauperate, flexuose, its rays soli- 

 tary, naked below, with spikelets above. Glumes fuscous, subequal, narrow, 

 acuminate. Flower about 6 mm. long, apically twisted, lateral awns about 

 thrice as long as the median. 



Mexico, S. Amer. and Philippine Is. (In Patagon.?) 



2. A. SETIFOLIA H. B. & K. 



A tufted perennial about 60 cm. high. Leaf-sheaths short, lower leaf- 

 blades numerous, narrow, involute. Panicle contracted, often included at 

 the base. Awns of flowering glume diverging, mostly equal. 



(Mexico and Brazil.) Probably in N. Patagon. 



15. STIPA Linn. Feather-grass. 



Tall, usually with convolute leaves which mostly persist around the fruit. 

 Panicles with i -flowered terete spikelets. Empty glumes 2, the floral 



