“No. 45. 
DIPLACHNE VISCIDA Scrib. 
Plant annual or short-lived perennial, light green or somewhat purplish on 
sheaths and inflorescence. 
Culms erect, or low and spreading from a tufted base, branching freely, geni- 
culate, hollow, terete, smooth, 6 to 15 inches tall. 
Leaves; radical and from radical shoots, few and short; of stem 3 to 5; sheaths 
about equaling internode, compressed, open, smooth; blade flat or folded, with 
slightly involute margins, somewhat scabrous above and below, 2 to 4 inches long; 
ligule membranaceous, truncate, lacerate, ? line long. 
Inflorescence a rather compact, narrow, erect panicle, 2 to 3 inches long, 
included at the base; rachis angular, slightly hispid; branches slender, alternate, — 
appressed or somewhat spreading at maturity, 4 to 1 inch long, bearing 6 to 1 
appressed, nearly sessile spikelets on the flattened rachis. 
Spikelets oblong, 4- to 6-flowered, 2 to 24 lines long; internode of slender 
rachilla articulate below, } line long; first glume ovate, acute, hyaline, scabrous 
on the single nerve, 1 line long; second glume same, scarcely $ line longer; floral 
glumes elliptical-oblong, 1 line long, 2 hyaline lobes or teeth at summit somewhat 
lacerate, lateral nerves nearly marginal, peace! below, vanishing in the margin 
in very obscure teeth, mucronate awn of mid-nerve $line long; palet elliptic-oblong, 
hyaline, with 2 scabrous nerves and shallow cleft apex, minutely ciliate. | 
| 
Grain light, opaque amber, with brown scar, elliptic, flattish, $ line long, 
falling with flower or spikelet nearly complete. 
PLATE XLV; a, spikelet; b, empty glumes; ec, floral glumes, dorsal and side 
views; d, palet. 
_#New Mexico, Arizona, and Mexico, 
