336 



GRASSES OF IOWA. 



each case being rudimentary. Empty glumes subulate, one to two- 

 nerved, minutely scabrous, produced into a long, slender, scabrous awn, 

 glume with awn 2.3 to 3.5 cm. long. Flowering glume of the lower 

 flower of the central spikelet 7.5 to 8.5 mm. long, on a very short stipe, 

 smoothish at the base, becoming scabrous and indistinctly three to five- 



Fig. 237. Hordeum Pammeli—a,, group of three spikelets; b, central 

 spikelet; e, florets of central spikelet ; 1 and 2, parts of fertile flower of 

 central spikelet ; 8 and 4, parts of staminate flower; 5, rudimentary- 

 flower ; d, lateral spikelet ; 1 and 2, parts of fertile flower of lateral 

 spikelet; 3 and 4, rudimentary flower. (Charlotte M. King. ) 



nerved toward the minute, bicuspidate apex, topped with a slender, sca- 

 brous awn 2.3 to 3.5 cm. long. Second flower shorter, 6 to 7 mm. long, 

 awn 7 to 15 mm. long. Rudimentary flower about 4 to 5 mm. long, 

 acuminate, joints of the rachilla about 1.5 mm. long. Floret of lateral 



