46 



Spike long-exserted on the slender pedicel, nodding, 6 to 9 cm. long; internodes 

 of the rachis angular, somewhat compressed, hispid-ciliate on the margins, 3 to 4 

 mm. long. Spikelets 2 at each joint, 2-flowered, the upper very small; empty 

 glumes divergent, linear-subulate, cylindrical and coriaceous at base, flattened, 

 scabrous, and 2 or 3 nerved above, 8 to 10 mm. long, or, including the stout, 

 straight, scabrous awn, 2 to 3 cm. long; flowering glume narrowly lanceolate, 

 acute, raised on a short stipe and separating from it by a horizontal constriction, 

 minutely scabrous, 3 to 5 nerved at apex, 7 mm. long, terminating in a straight, 



slender, scabrous awn 2 

 to 4 cm. long. Pale a 

 slightly shorter than its 

 glume, rounded or slight- 

 ly bidentate at apex, his- 

 pid on the keels above. 

 E. arkamanus is allied to E. 

 striatus, from which it is 

 distinguished by having 

 the empty and flowering 

 glumes minutely scab- 

 rous instead of hirsute. 

 Type collected by F. L. Har- 

 vey (Arkansas Flora 7, in 

 part) in woods of north- 

 western Arkansas. The 

 same sheet bears also a 

 specimen of E. striatus. 

 Specimens examined. — Ar- 

 kansas: Fort Smith, Dr. 

 J. M. Bigelow, in Whip- 

 ple's Exploration, 1853- 

 1855. Missouri: Spring- 

 field, S. A. Hoover, 1897. 

 loiva: Nodaway River, 

 Adair County, F. C. 

 Stewart, July, 1892 

 (Herb. Iowa State Col- 

 lege). 

 ELYMUS ATJSTRALIS 



sp. nov. (Fig. 20.) 

 A tall, stout perennial with 

 broad leaves and a large 

 bristly spike. Culms 

 erect, 9 to 14 dm. high, 

 terete, smooth; nodes 

 smooth; sheaths scab- 

 rous-hirsute, especially on the margins, longer or shorter than the internodes, 

 the ui)per ones smooth and somewhat inflated; ligule a mere ring less than 

 0.5 mm. long, entire; leaf-blades ascending, 2 to 3 dm. long, 1 to 1.5 cm. wide, 

 acuminate, strongly scabrous below, scabrous or scabrous-hirsute above. Spike 

 robust, bristly, 1 to 1.3 dm. long, the peduncle exserted, 0.5 to 1.5 dm.; rachis 

 angular, compressed, scabrous-pubescent on the margins and on the back above. 

 Spikelets 2 at each node, 4 to 5 flowered; empty glumes divergent, thickened, 

 coriaceous and somewhat curved at the ba.se, 5-nerved above, scabrous-hirsute 

 or rarely nearly smooth, about 1.5 cm. long, tipped with a short, straight awn 

 of equal length; flowering glume Imriic on a stout stipe, lanceolate, 8 to 10 mm. 



Fk;. 20.— ElymuK auntrah's Scribn. <& Ball: o, a single spikelet, 

 showing hairy glumes. 



