CH. iv] Key to Vegetative Characters 31 



Festuca elatior (p. 99), very similar to L. italicum, 



but stouter and coarser foliage, and small 



creamy-white auricles. 

 Festuca pralensis (p. 100), as F. elatior, but smaller 



plant and extremely short ligule. 

 Hordeum sativum (cultivated Barleys), auricles very 



large, overlapping, glabrous, and white, pink 



or purple. 



(6) Without auricles. 



Cynosurus cristatus may come here (see above, also 

 p. 90). 



PJileum pratense (p. 121), numerous, short, pale- 

 green leaves; ligule white, and short on lower 

 leaves; base of stem often swollen. 



Alopecurus pratensis (p. 59), blades long, dark- 

 green, with distinct flat ribs; ligule short and 

 blunt; old basal sheaths chocolate. 



A. agrestis (p. 61), ribs relatively high and acute; 

 annual; on cultivated ground. 



A. geniculatus (p. 61), culms "kneed"; ribs acute; 

 aquatic. 



Agrostis alba (pp. 54-56), var. vulgaris ligule short; 

 blades thin; var. stolonifera ligule long and 

 delicate; stolons present; blades thin; var. 

 repens has stout rhizomes. 



A. canina (p. 56), blades narrow; ligule long, acute. 



Aira co3spitosa (p. 56), coarse tufts ; leaves firm, 

 rigid, with high sharp ribs; ligule long. 



Poa nemoralis (p. 125), ligule very short or wanting; 



blade thin and narrow; shade grass. 

 L Avena fatua (p. 73), ligule short and blunt; annual; 



on cultivated ground. 



*A. sativa (cultivated Oat), similar to A. fatua ; ligule 

 membranous and toothed. 



Bromus inermis (p. 87), well developed rhizomes; 

 very short ligule; entire sheaths. 



1 Some varieties are slightly hairy on the lower margins of the leaves. 



