478 CONTEIBUTIONS FEOM THE NATIONAL HEEBAEIUM. 



22. Panicura pampinosum Hitchc. & Chase. 



Panicum pampinosum Hitchc. & Chase, Contr. U. S. Nat. Herb, 15: 66. 1910. 

 Culma 15 to 40 cm. high, aacending from a decumbent base or widely spreading. 



DISTRIBUTION. 



Open ground and depressions in mesas, 

 southwestern United States to central 

 Mexico. The type specimen from Ari- 

 zona. 



Chihtjahua: Minaca, Hitchcock 7751, 



7756. 

 Guanajuato: Acambaro, Hitchcoch 



6952. 



Fig. 35.— Distribution of P. pampinosum. 



" 23. Panicum decolorans H. B. "K. 



Panicum decolorans H. B. K. Nov. Gen. & Sp. 1: 100. 1816; Contr. U. S. Nat. Herb. 

 15: 66. 328. 1910. 



distribution. 



Fields and waste ground, central Mexico. 

 The type specimen from Queretaro. 



San Lots Potosi: Cardenas, Amer. Gr. 



Nat. Herb. 29. 

 Queretaro: Queretaro, Ba^ile 51, 52, 



Hitchcock 5822, 5864. 

 Puebla: Tehuacan, Hitchcock 6057. 



Fig. 36.— Distribution of F. decolorans. 



24. Panicura stramineura Hitchc. & Chase. 



Panicum stramineum Hitchc. & Chase, Contr. U. S. Nat. Herb. 15: 67. 1910. 

 This species was described as having glabrous (or sometimes ciliate) blades. Later 

 collections show that the blades are sometimes sparsely papillose-pilose. 



distribution. 



Rich bottom lands and damp soil, Arizona 

 to Michoacan. The type specimen from 

 Guaymas. 



Sonora: Guaymas, Palmer 168a and 



206 in 1887. 

 Sinaloa: CuUacan, Palmer 1538 in 

 1891. Between Rosario and Aca- 

 poneta, Rose 1S78, 1883. 

 Durango: Durango, Hitchcock 7658. 

 Tepic: Between Concepcion and Acaponeta, Rose 1889. Acaponeta, Rose 3281. 

 Michoacan: Morelia, Arsine 60, 2985. 

 Guerrero: LagumWas, Langlasse 2Q3.^ 



^ In the Revision this specimen was doubtfully referred to P. filipes Scribn. (Contr. 

 U. S. Nat. Herb. 15: 74. 1910). 



Fig. 37.— Distribution of P. stramineum. 



