32 Botanical Section [pt i 



Arundo Phragmites (p. 66), ligule represented by a 



fringe of hair; aquatic. 

 Digraphis arundinacea (p. 95), ligule membranous 

 and well developed; aquatic. 

 B. (continued). Shoot cylindrical (circular or oval in transverse 

 section), plants more or less hairy or pubescent. 



(a) With auricles (very small in H. pratense). 



Bromus asper (p. 85), sheath entire and bearing 



long reflexed hairs; shade species. 

 Hordeum pratense (p. Ill), blades firm, hairy above, 



glabrous and glossy below. 

 H. murinum (p. 109), blades thin and softly hairy 



on both surfaces ; annual. 

 1 Agropyrum repens (p. 51), well developed rhizomes; 



hairs chiefly on upper surface of blade. 

 Triticum sativum (common Wheats), hairs on edges of 



auricles; sheath pubescent (different varieties 



vary much in these respects). 

 1 Secale cereale (Rye), short and long hairs on sheath; 



base of sheath reddish in colour. Auricles slight. 



(b) Without auricles. 



Holcus lanatus (p. 106), blades velvety to touch; 



pink veins on basal sheaths. 

 1 Arrhenatherum avenaceum (p. 63), sparsely hairy on 



sheath or blade; ligule blunt; roots yellow; 



tufted. 

 Avena fiavescens (p. 68), pale green blades which 



are thin, dull, and hairy on both sides ; reflexed 



hairs on sheath. 

 Anthoxanthum odoratum (p. 61), long hairs at juncture 



of sheath and blade ; sweet-scented. 

 Briza media (p. 77), blades with rough hairy margins 



and low flat ribs. 

 Bromus arvensis and vars. (pp. 79-82), entire sheaths 



with slight keel or none; softly downy. 

 B. sterilis (p. 82), as B. arvensis but keel more 



prominent on sheath; ligule deeply ragged. 

 1 Hairiness varies considerably in these species. 



