GRASSES OF IOWA. 335 



Sheridan Count)', Pammel ; Yellowstone National Park, A. and E. Nel- 

 son; Dale Creek, Pammel, Johnson, Buchanan and Lummis), New Mex- 

 ico (Vasey), Nevada (Montella, Pammel), Idaho (Sandberg), and 

 California. 



General. Europe and Siberia. 



4. HORDEUM NODOSUM. 



Hordeum nodosum L. Sp. PI. 56. (2ed.) 1762. Scribner. Bull. U. S. 

 Dept. Agrl. Div. Agros. 17: 313. /. 609. Nash in Britton and Brown. 111. 

 Fl. 1: 228. /. 529. 



DESCRIPTION. 



Wild or Meadow Barley. A slender, erect, caespitose grass, f to 2 

 feet (2-6 dm.) high, with flat leaves, and narrow, bearded spikes, § to 3 

 inches (2-8 cm.) long. Empty glumes all setaceous or awn-like; lateral 

 spikelets imperfect. Awns 3 to 6 lines (6-12 mm.) long. May to 

 August. See figure 236, on page 333. 



DISTRIBUTION. 



Ioiva. Hawarden; Lyon County. 



North America. Indiana and Minnesota to Alaska, and south to 

 Tennessee, Mississippi, Texas and California. 

 General. Europe and Asia. 



5. HORDEUM PAMMELI. 

 Hordeum Pammeli Scribner andBall. n. sp. 



DESCRIPTION. 



Pammel' s Wild Barley. A caespitose, glabrous perennial, erect 

 or somewhat geniculate at the base, 6 to 10 dm. high. Sheaths smooth, 

 shorter than the internodes; ligule a scarious ring about .5 mm. long; 

 blades flat, linear-lanceolate, 5 to 8 mm. wide, 1.2 to 2 dm. long, mi- 

 nutely retrose-scabrous on both surfaces, long-acuminate at the apex. 

 Spikes exserted, nodding, long and slender, 8 to 17 cm. long and 6 to 

 8 mm. wide, excluding the awns, or 2 to 3 cm. wide with the awns. Joints 

 of the rachis about 2.5 mm. long, scabrous, articulated, separating at 

 maturity. Spikelets three at each joint, ascending or somewhat ap- 

 pressed, the central sessile, the lateral ones nearly so, on very short pedi- 

 cels, less than .5 mm. in length, all containing fertile flowers, the cen- 

 tral three-flowered, the lateral two-flowered, the uppermost flower in 



