G20 



RED THREE-AWN 



Ari'stida longise'ta 1 



Flower heads (panicles) erect, rather narrow 

 but not stiff, few-flowered, (usually somewhat 

 longer, 4 to 8 in. long, in the variety robusta 

 (A)), with short, narrowly ascending branches, 

 lower branches somewhat curved in the species 

 (B) but stiffly erect in var. robu&ta, 



Individual flower groups (spikelets) purplish, 

 single-flowered, short-stalked, mostly erect 



Outer flower bract (lemma) about K in. long, 

 firm in texture, wrapped around seed, without 

 neck at top, tipped by 3-parted bristle (awn) ; 

 awn divisions about equal, up to 4% in. lone 

 (usually shorter in var.. robusta), widely spread- 

 ing at maturity (N. B. The ends of the awn 

 branches in fig. G have been cut off) 



Lowest (2) spikelet bracts (glumes) 1-veiried, 

 awn-pointed or abruptly sharp-pointed, very 

 unequal in length, 1st glume about $ as long as 

 2d glume 



1 Including the 

 variety A. lon- 

 gise'ta robus'ta, 

 syn. A. pur- 

 pu'rea robus'ta. 



The plant on the left is the 

 var. robusta; that on the 

 right is typical of the 

 species. 



Stalks (culms) erect, up to 16 in. high (taller, 

 up to 20 in. high, in var. robusta), hairless 



Leaves densely cushion-tufted in typical form 

 of species (not conspicuously tufted in var. 

 robusta and with more stalk leaves), usually 

 less than 6 in. long, sharp-pointed, inrolled, 

 harsh on upper surface, sometimes slightly 

 harsh on lower surface' 



Roots thickened-fibrous 



