40 THE AMERICAN MIDLAND NATURALIST 
8. PODOSEMUM AFFINE (Trinius) n. comb. 
Muhlenbergia affinis Trin. Mem. Acad. Peterb. Sci. 6:301. 
6. 2m Say: 
Western Texas to Ariz., according to Dewey in the Manual of 
the Plants of Western Texas. 
Western Texas to Arizona and Mexico. 
I have not been able to see many specimens of this species, and 
it may be that it is only a form of Muhlenbergia rigida (Sc. B. K.) 
Kunth. Rev. Gram. 63. 1829, and if so, this becomes PODOSEMUM 
RIGIDUM “HISB. 1K. “Nov: “Gen. '& Sp: 19. E876: 
SPECIMENS EXAMINED: 
NEW MEXICO: 
Hillsboro, Metcalfe 1447, October 2, 1904. M. B. G. Herb. 
No. 79826; 
Santa ‘Rita Mountains, Metcalfe 1485, date not given. 
MMB.” Gt Herb N 0379825: 
ARIZONA: 
Rozemont,. Thornber 65, October 10, 1903; 
Rozemont, Thornber 65, October 10, 1903. M. B. G. Herb. 
No. 80117. 
MEXICO: k 
San Pedro, Hitchcock 7301, September 27-28, 1910 U. 
S. A. Herb. 
9. PODOSEMUM ARENICOLUM (Buckley) n. comb. 
Muhlenbergia arenicola Buckley. Proc. Acad. Sci. Philad. 
1862:91. 1862. : 
Western Texas to Ariz., according to Dewey in the Manual of 
the Plants of Western Texas. 
Western ‘Texas, Arizona and New Mexico. 
SPECIMENS EXAMINED: 
TEXAS: 
Van Horn, Eggert, July 10, 1910. M. B. G. Herb. No. 
82693 ; 
Without definite locality, Wright 735, May to October, 
1849. M. B. G. Herb. No. 79671; 
Without definite locality, Wright 735, May to October, 
1849. M. B. G. Herb. No. 80025. 
ARIZONA: 
Mustang Mountains, Pringle, September 12, 1884. N. D. 
ler bs; ® 
