17 



Fig. 11. ANDROPOGON ARGYR-ffiUS Schultes, Mant. 2 : 450. 1824. {A. ar- 

 genteus Ell. Sk. Bot. S. C. & Ga. 1 : 148. 1817, not DC. 1813.) SILVER-BEARD or 

 SILVERY BEARD-GRASS.— A rather slender native perennial 6-9 dm. (2°-3°) 

 high, with narrow leaves and silky-bearded racemes which are in pairs, termi- 

 nal on the culm or its branches. Sessile spikelet (a) 5 mm. (2i") long, with 

 the awn of the flowering glume (e) 12-18 mm. (6"-9") long.— In dry sandy soil 

 in open woods and along thicket borders, from Delaware to Missouri and 

 southward to the Gulf. August to October. 



Var. TENUIS Vasey, Contr. U. S. Nat. Herb. 3 : 12. 1892, has more slender culms, 

 narrower, linear leaves, and fewer spikelets. 



A grass closely related to broom sedge but probably of greater agricultural 

 value. It does not infest neglected fields as does that species. 

 20801— No. 7 2 



