No. 12. 



MUHLENBERGIA BUCKLEY AN A Scribn. (lluhlenbergia Texana 



Buckl. not Thurb.) 



Plant annual, diffuse, spreading. 



Culms tufted at base, spreading, terete, slender, smooth, branching below, 10 

 to 15 inches tall. 



Radical leaves few and small; of culm 1 to 3, usually 2; sheaths rather loose, 

 somewhat vaginate, or compressed and open, slightly scabrous, longer than inter- 

 nodes; blade flat or involute, scabrous on both sides, 1 to 2 inches long. 



Inflorescence an oblong, loose, spreading panicle 4 to 8 inches long; rachis and 

 branches slender, terete, often purple, the latter mostly alternate, 1 to 3 inches long, 

 bearing solitary spikelets on slender pedicels 1 to 2 lines long. 



Spikelets narrowly lanceolate, 1-flowered, 1 line long; first glume ovate, acute, 

 hyaline, pubescent, 1 -nerved, i line long with a very short awn; second glume 

 same but little larger; floral glume oblong, 2-toothed at apex, \ to 1 line long, 

 3-nerved, slightly pubescent on the nerves, midnerve excurrent in an awn as long 

 as the glume; palet lanceolate, nearly acute, thin, 2-nerved, 1 line long. 



Grain narrowly obovate, rounded at apex, compressed, reddish-amber, -} line 

 long, falling with floral glume and palet but easily escaping. 



Plate XII; a, spikelet enlarged; b, empty glumes; c, floral glume; d, palet, 



Texas, New Mexico to Mexico on rocky hills. 



