No. 12. 



MUHLENBERGIA BUCKLEYANA Scribn. (Jfnhlenbergia 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, \ 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, | 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. 



