190 



GRASSES OF IOWA. 



description. 



Long Glumed Wild 

 Oats. Annual, with 

 leaves and sheaths lightly 

 pilose; truncate ligule 

 with short, hairy fringe: 

 lower part of panicle 

 drooping; spikelets three- 

 flowered ; empty glumes 

 far exceeding the floret, 

 and both alike g-nerved ; 

 very pilose rachilla joint- 

 ed, lower joint persistent, 

 florets from base beyond 

 the middle softly pilose; 

 glumes slightly unequal, 

 upper 7-nerved, awned a 

 little beyond the middle 

 with two very long, 

 bristly hairs, more than 

 half as long as the 

 glume; the lower with 

 the linear apex two- 

 toothed. Algeria. In- 

 troduced on the college 

 grounds but not persist- 

 ent. 



Iowa. Ames (Bessey) ; 

 Ames (cult.). 



Fig. 134. Avena longiglumis—n., spikelet: 1, 

 empty glume; 2, flowering glume; 3, rudimentary 

 spikelet. (Charlotte M. King. ) 



3. ARRHENATHERUM. 



Arrhenatherwn Beauv . Agrost. 55. pi. n. f. J. 1812. Endlicher (Jen. 

 PI. 96. Bentham and Hooker. Gen. PI. 3: 1161. Hackel in Engler and 

 Prantl. Nat. Pflanz. Fam. II. 2: 56./. 64. 



Avena Host. Gram. Austr. 2: pi. 49. 4: pi. 30. Scribner. Bull. U. S. 

 Dept. Agrl. Div. Agros. 20: 95./. 71. (Rev. ed.) 



Spikelets open-panicled, 2 -flowered, with the rudiment of a third 

 flower; the middle flower perfect, its glume barely bristle-pointed from 

 near the tip; the lowest flower staminate only, bearing a long, bent awn 

 below the middle of the back; otherwise as in Avena, of which it is only 

 a peculiar modification. (Name from two Greek words for masculine 

 and awn.) 



