38 GRAMINEAE 



2. H. jubatum L. Squibbkl Tail Gkass. 1°-2° high, ascending : 

 spikes 2'-4' long, the awns widely spreading, so that it is I'-S' wide : 

 awns of flowering glume %"-2i" long : lateral flowers short-awned. — In- 

 troduced locally in waste places. Very abundant at Shefiield. May- 

 June. 



54. ELYMUS L. WILD Eye. 



Spikelets all similar, one-seven-flowered in dense terminal spikes, ses- 

 sile, 2-4 at each joint of the rachis. Empty glumes two to each spikelet 

 forming a sort of involucre. Flowering glumes rounded on the hack, 

 awned, 5-nerved. 



Empty glumes conspicuously thickened at base. 



Flowering glumes smooth. 1. E. Virginieus. 



Flowering glumes hispidulous-pubescent. 2. E. Mrsutiglumis. 

 Empty glumes not conspicuously thickened at base. 



Empty glumes strongly hirsute. 3. E. striatus. 



Empty glumes not strongly hirsute. 4. E. Canadennis. 



1. B. Virginieus L. Culms stout, glabrous, 2°-4° high : spike 2'-5'' 

 long, 5"-l" wide (without awns), erect, from partly included in the 

 upper sheath to long-pedunoled : spikelets 2-3-flowered, 2-3 together : 

 empty glumes strongly 5-7-nerved, bearing awns of their own length. — 

 Common in woods and low grounds. June-October. 



2. £!. hirsutiglumis Scribn. Resembles No. 1. Spike glaucous-whit- 

 ened : empty glumes rough : flowering glumes strongly hispidulous- 

 pubescent. — Frequent on muddy river banks and in low woods. • June- 

 October. 



3. E. striatus Willd. 2°-4° high, slender : sheaths strongly pubescent: 

 spikes 'i'-b' long, V-h" wide (without awns), erect, long-exserted : 

 spikelets 1-2-flowered, mostly in pairs : empty glumes subulate, 3-nerved: 

 flowering glume %" long, bearing an awn 12" long. — Common in dry 

 soil. 



4. E. Canadensis L. Culms stout, glabrous, 3°-4° high : spike S'-Q' 

 long, 6"-8" wide (without the awns), erect to drooping, exserted: 

 empty glumes rough, strongly several-nerved, 15" long with the awn ; 

 flowering glumes soft-pubescent, the awn S'^-IS" long. — Occasional in 

 dry grounds. June-October. 



Var. robustus (S. & S. ) Mackenzie & Bush, n. comb. Spikes 9" wide 

 (without awns), b'-W long: flowering glumes hispidulous-pubescent, the 

 awns often 24" long. — Abundant in dry grounds. {Elymus robuatus S. & S. ) 



Var. glaucifoliUB (Willd.) Gray. Whole plant strongly glaucous: 

 flowering glumes soft pubescent. Otherwise like var. robustus. — Occa- 

 sional in dry grounds, throughout, especially abundant at Little Blue 

 Tank. 



55. HYSTRIX Moenoh. Bottlk-bhush Grass. 



Spikelets in terminal spikes, 2-3 together at each joint of the rachis, 

 2-3-flowered, on a short pedicel. Empty glumes awl-shaped, usually 



