CH. YII] Botanical Description of Species 131 



Sesleria ccerulea, Ard. (Blue Moor-grass.) (Fig. 148.) 

 A small perennial, uncommon in this country except on the 

 upland limestone regions of North Britain. Its leaves are flat, 

 hard, rigid, and of a glaucous blue. Flowers in April or May, the 

 culms being from 6 inches to a foot high; entire sheaths. Panicle 

 ovoid and spike-like, three-fourths of an inch or less in length. 



Fig. 149. "Seed" 

 of Triodia decum- 

 bens, front view. 

 xlO. 



Fig. 148. Sesleria ccerulea. 

 About J nat. size. 



Spikelets 2-3 flowered. Glumes nearly equal, broad; the upper 

 half of their keels rough. 



"Seeds." Outer palea about 4mm. long, five-nerved, the 

 central nerve ending in a short awn-point; the remaining nerves 

 forming four teeth at the apex of the outer palea. Inner palea 

 bifid at the top, and its marginal ribs fringed. 



92 



