22 



BULLETIN 461, U. S. DEPARTMENT OF AGRICULTURE. 



36. Spreading witch-grass (Panicum dichotomiflorum ; fig. 40). 



A coarse, tufted, glabrous annual ; leaves rolled in the bud ; collar broad, 

 continuous, glabrous ; auricles none ; ligule a fringe of hairs ; sheaths slightly 

 compressed, glabrous ; blades flat, glossy beneath, dull above, one-half inch 

 wide, sharp pointed ; midnerve light green, slightly rough. 



37. Rescue grass (Bromus unioloides; fig. 41). 



A coarse, tufted grass, annual or sometimes perennial ; leaves rolled in the 

 bud ; collar broad, continuous, hairy ; auricles none ; ligule long, membra- 

 nous, entire, hairy on the back ; sheaths strongly compressed, hairy, the 

 older ones with pink nerves ; blades flat, sparsely hairy, one-half inch wide. 

 This grass makes considerable winter growth in the Southern States. 



38. Velvet grass (Holcus lanatus; fig. 42). 

 A pale, tufted, hairy perennial ; leaves 

 rolled in the bud ; collar continuous, 

 hairy ; auricles none ; ligule short, mem- 

 branous, coarsely toothed at apex, hairy 

 on the back ; sheaths compressed, pink 

 nerved, densely hairy ; blades flat, soft, 

 hairy, one-half inch wide, sharp pointed. 



Fig. 39. — Yellow foxtail (Chaetocliloa 

 lutesoens). 



Fig. 40. — Spreading witch-grass 

 (Panicum dichotomiflorum. ) 



39. Crab-grass (Syntherisma sanguinaUs; fig. 43). 



A pale-green annual, creeping by stolons ; leaves rolled in the bud ; collar 

 broad, prominent, sparsely hairy ; auricles none ; ligule membranous, long, 

 acute, toothed ; sheaths compressed, hairy ; blades flat, sparsely hairy, wavy 

 margined, one-fourth inch wide, sharp pointed ; stolons about one-sixteenth 

 inch in diameter, much branched. 



40. Small crab-grass (Syntherisma ischaemum; fig. 44). 



A low-growing annual, creeping by stolons ; leaves rolled in the bud ; collar 

 broad, sparsely hairy ; auricles none ; ligule membranous, long, entire ; 

 sheaths compressed, glabrous ; blades flat, sparsely hairy at base, otherwise 

 glabrous, one-fourth inch wide, sharp pointed; stolons about one-sixteenth 

 inch in diameter, branched. 



