i8o 



PATAGONIAN EXPEDITIONS : BOTANY. 



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3. A. GENICULATUS Linn. (A. aristulatiis Mich.) 

 Culm smooth, erect, 25 cm. tall. Sheaths loose, shorter than the inter- 

 nodes ; leaf-blades 1-4 mm. wide, scabrous. Spike ovoid-cylindrical. 



Empty glumes over 2 mm. long, united 

 only at the base, the keels ciliated. Floral 

 glume shorter, obtuse, dorsally awned at 

 its lower quarter, the awns protruding. 

 (Eurasia and N. Amer.; Australia.) 



N. Patagon., in valley of Rio Negro and 

 elsewhere ; by Rio Gallegos (Barnum 

 Brown). "Gramilla de banado." 



FIG. 33. 



4. A. LECHLERI Steud. (A. magellanica 

 Lam. A. alpimis aristatus Hook, f.) 



Culm erect, terete, over i m.tall. Leaf- 



Alopecurus antarcticus. Spike, slightly 7,71 777 



reduced; and magnified spikeiet. sheaths long, glabrous, the blades narrow, 



semi-convolute, acuminate, smooth. Spike 



ovate-oblong, dense. Glumes subconnate at base, villous, 3-nerved, 

 equalling the flowers. Awn scarcely exceeding the glumes. 

 Valdivia. 



20. SPOROBOLUS R. Br. 



Leaves flat or convolute, the throat usually bearded, often sheathing 

 the open or contracted panicle. Spikelets small, i- (or 2-3-) flowered. 

 Glumes 3, awnless and usually pointless ; the first shorter, the floral glume 

 equalling or exceeding the others. Stamens 3, occasionally 2 ; grain early 

 deciduous, often thin with the loose seed. 



Species 80, many American. 



i. S. ARUNDINACEUS Gray (non Vasey). (Diachyrium.\ 



Culm 60-90 cm. tall, smooth, compressed-cylindrical, densely enclosed 

 at base in 10 mm. broad sheaths, leafless above. Leaves as long as the 

 culm, cylindrical, pungent, the sheaths being long, woolly-margined : the 

 lower sheaths bladeless. Panicle 25 cm. long, 3-4 cm. broad, attenuate 

 both ways. Pedicels thick at top, same length as the spikelets. Empty 

 glumes lanceolate, acuminate, carinate, longer (5-6 mm.) than the flower- 

 ing glume and palea. 



(Catamarca) ; N. Patagon. S. Patagon, by Rio Chico. 



