CH. vn] Botanical Description of Species 



95 



Glumes nearly equal, strongly keeled and pointed, with scarious 

 margins; the lower one distinctly hairy on the keel, and 

 to a lesser extent on the margins; the upper glume less 

 hairy. 



"Seed" Outer palea of a light straw colour, varying from 

 4 to 9 mm. in length (usual length 5-6 mm.), terminating in a 

 curved point sometimes one- third the length of the palea. The 

 upper part of the keel of the outer palea is either distinctly hairy 



Fig. 92. "Seed" of 

 Digraphis arundi- 

 nacea. x 10. 



Fig. -93. "Seed" of 

 Elymus arenarius. x 5. 



or serrated. Inner palea 4-6 mm. long, thin and membranous. 

 Kachilla cylindrical, enlarged above. The "seeds" frequently 

 remain attached in twos or threes as in the spikelet. (Figs. 88 

 and 89). 



Digraphis arundinacea, Trin. (Reed-grass.) (Fig. 90.) 



A semi-aquatic, and entirely glabrous perennial. The creeping 



rhizomes frequently bear pink or deep red scales (rudimentary 



leaves). Shoots cylindrical ; sheaths split, with the thin membranous 



margins much overlapping. Leaf-blades long and often an inch 



