43 



Fig. 37. PANICXJM HUMIFUSUM (Pers.) Kunth, Rev. Gram. 1 : 33. 1835. 

 (Digitaria humifuKU Pers. Syn. 1 : s.i. 1805; Panicum lineare Krock. 1787, not Linn. 

 176'J; Panicum glabrum Gaud. 1811; SyntherismaUnearis'NaiSh.) SMOOTH CRAB- 

 GRASS.— A slender, glabrous annual 1.5-3.5 dm. (6'-14') high, with culms which 

 are much branched below, flat glabrous leaves, and two to six slender diverg- 

 ing spikes, usually3-6cm. (li'-2i') long. Spikelets (o, b) 2-2.5 mm. {l"-li")]ong, 

 subacute, the 3-nerved second glume and 7-nerved third glume about as long as 

 the floral glume (c, d), pubescent on the margins and between the nerves; 

 first glume very small or wholly wanting. — Naturalized in waste and culti- 

 vated lands; Nova Scotia to Ontario and South Dakota, south to Florida and 

 Texas. (Europe.) August to October. 



Of little or no agricultural value. 



