109 



Fig. 405. Cenchrus incertus M. A. Curt. Bost. Jonrn. Nat. 

 Hist. 1 : 13.5. 1837. (C. stricius Chapm. Coult. Bot. Gaz. 3 : 20. 

 1878.) SofTHKRX Sand-bur.— A smooth, asceuding, aud more 

 or less brauclied perennial ( ?), i.o to 9 dm. liigh, with dat leaves 

 and slender spikes 5 to 8 cm. long. Spikelets inclosed in a bur- 

 like involucre (a) which is naked below, with 6 to 12 stout spines 

 jiljove.— Sandy soil along the coast, Georgia to Florida aud west- 

 ward to Texas. June-October. 



