130 



Botanical Section 



[PT I 



blades erect, long, narrow and rolled; rough on the upper surface, 

 glabrous below. Ligule long and divided. No auricles. 



Flowers in July, the culms about 2 feet high. Panicle erect, 

 spike-like, tapering above and below. Spikelets 10 mm. or more 

 in length, narrow, one-flowered. Glumes rather unequal, narrow 

 and acute. 



Fig. 147. "Seed" 

 of Psammz are- 

 naria, side view. 

 x5. 



Fig. 146. Psamma arenaria, showing inflorescence and 

 a jcrticn of the rhizcme. About J nat. size 



"Seed" Outer palea five-nerved, the central nerve minutely 

 toothed, and slightly projecting beyond the apex of the outer 

 palea. A basal tuft of long silky hairs is present. Rachilla 

 slender, round, with fine silky hairs. (Fig. 147.) 



