MISSOURI MUHLENBRRGIAS 9I 



952423, labeled M. sylvatica var. — and M. Willdenovii by 

 Scribner ; 

 Without definite locality, Reverchon 71, U. S. Herb. No. 

 952413, labeled M. sylvatica and M. soboUfera by Scribner, 

 and M. Mexicana by Hitchcock. 



Arizona : 



Grapevine Canon, Tourney 168, July 30, 1891, U. S. Herb. No. 



952422; 

 Without definite locality, McDougal, 1891, U. S. Herb. No. 

 952421. 

 12. MuHLENBERGiA POLYSTACHYA Mackenzie and Bush, Manual 

 of the Flora of Jackson County, Missouri, 23, 1902. 

 Muhlenbergia Mexicana Scribner, 1. c, in part, not M. Mexicana 



Trin, 1824. 

 Muhlenbergia Mexicana Hitchcock in Manual in part, not 

 M. Mexicana Trin. 1824. 

 Not mentioned by Nash in the Illustrated Flora. Missouri and 

 Illinois to Wisconsin. 



This species has been neglected or misunderstood since it was 

 first described, and in order that my readers may see how very 

 different it is from M. Mexicana, to which it has been referred by 

 two agrostologists, I herewith present the original description; 

 M. POLYSTACHYA Mackenzie & Bush, n. sp. 2 feet high, erect, 

 much branched; leaves i 1-2 inches to 2 1-2 inches long, i line to 

 2 lines wide; panicles on peduncles i inch to 5 inches long, long- 

 exserted, densely flowered, the lower branches separated; flowers 

 nearly sessile, i line long; the glames as in the last (M. Mexicana); 

 hairs at base of flowering glume copious, 1-3 to 1-2 length of glume. 

 Open rocky woods east of Sibley. August-October. 



Specimens Examined: 

 Missouri : 



Sibley, Bush, October 14, 1901; 



Sibley, Btish 417 1, October 10, 1906, U. S. Herb. No. 950396, 

 with lemmas awned; 



Sibley, Mackenzie 637, October 14, 1901, type. 

 Illinois: 



Fulton County, Wolf, date not given, U. S. Herb. No. 952504; 



Urbana, collector not given, 1876, U. 111. Herb.; 



Wady Pctra, Chase 1268, September 23, 1906, U. S. A. Herb.; 



