No. 43. 

 D.PLACHNE REVERCHONI Vasey. 



Plant a low tufted annual. 



Culms erect, slender, not branched, 3 to 10 inches long. 



Leaves at base, numerous, involute, setose, smooth, 1 to 2i inches long; of 

 culms 1 or 2 above base, mostly exceeded by radical leaves ; sheaths striate, close, 

 smooth; blade filiform, involute; ligule a minute, hairy fringe. 



Inflorescence a spike- like panicle, 1-J to 3 inches long; the nearly sessile, ap- 

 pressed spikelets alternate along the striate slender rachis. 



Spikelets lance-linear, 6- to 10-flowered, 3 to 4 lines long; internode of rachilla 

 glabrous; first glume ovate, acute, carinate, membranaceous, 1-nerved, smooth, 1 

 line long; second glume oblong, obtuse or obscurely toothed % line longer; floral 

 glumes li lines long, ovate-lanceolate, membranaceous, 2 teeth at apex, 2 lateral 

 nerves slightly pubescent at base, vanishing before reaching the margin, mid-nerve 

 excurrent into a minute hispid awn ^ line long; palet linear-lanceolate, 2-keeled, 

 cleft at apex, minutely ciliate, f line long. 



Grain light amber color, narrowly conical, falling with flower but easily sepa- 

 rated. 



Plate XLIII; a, spikelet; b, empty glumes; c, floral glumes, dorsal and side 

 views; d, palet. 



Texas to Mexico. First collected by J. Reverchon, Texas. It has been re- 

 ferred to D. simplex Doell, from which I think it differs. 



