No. 13. 

 MUHLENBERGIA NEO-MEXICAN A Vasey. 



Plant slender, tufted, perennial, from thick, knotted, or sometimes creeping 

 rootstock.s. 



Culm bi'anching freely below, iTect, slender, terete, nearly smooth, 12 to is 

 inches tall. 



Leaves ; of culms 4 to G; sheaths longer than internodes, close, slightly rough- 

 ened; blades erect, appressed, closely involute and setaceous, 2 to 3 inches long; 

 ligule an irregular, ovate, lacerate membrane \ line long. 



Inflorescence a narrow, erect or slightly nodding panicle, 3 to 4 inches long, 

 often purple; branches alternate, erect, hispid, \ to 1 inch long, bearing rather 

 close clusters of spikelets on hispid pedicels ^ to 11 lines long. 



Spil'eJefs narrow, 1-flowered, 2 lines long; empty glumes equal, lance-ovate, 

 acute, carinate, hyaline, 1 -nerved, l.line long, terminating in a slender awn i to ^ 

 line long; floral glume narrowly conical, lanceolate, acute when unrolled, thin, 

 smooth, minutely pubescent at base, 3-nerved, terminating in an awn ^ inch long: 

 palet obscurely 2-uerved, 2 lines long, often projecting out of the floral glume; 

 stamens 3. 



G-i'ain, none present in the 34 specimens examined. 



Plate XIII ; o. panicle at maturity; h, cluster of spikelets; c, spikelet enlarged. 

 Rocky ledges, New Mexico and Arizona, 



