478 
CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
22. Panicum pampinosum Hitchce. & Chase. 
Panicum pampinosum Hitche. & Chase, Contr. U. 8. Nat. Herb. 15: 66. 1910. 
Culms 15 to 40 cm. high, ascending from a decumbent base or widely spreading. 
Le H 
. . 
er H 
; * ! 
H 
Deeen b peeed 
Fig. 35.—Distribution of P. pampinosum. 
DISTRIBUTION. 
Open ground and depressicns in mesas, 
southwestern United States to 
Mexico. 
zona. 
central 
The type specimen from Ari- 
CHInuAHUA: Mifiaca, Hitchcock 7751, 
7756. 
GUANAJUATO: 
6952. 
Acdmbaro, Hitchcock 
28. Panicum decolorans H. B. K. 
Panicum decolorans H. B. K. Nov. Gen. & Sp. 1: 100. 1816; Contr. U. 8. Nat. Herb. 
15: 66. 328. 1910. 
DISTRIBUTION. 
Fields and waste ground, central Mexico. 
The type specimen from Querétaro. 
San Luis Porosi: Cardenas, Amer. Gr. 
Nat. Herb. 29. 
QUERETARO: Querétaro, Basile 51, 52, 
Hitchcock 5822, 5864. 
Puesua: Tehuacdn, Hitchcock 6057. 
Fig. 36.—Distribution of P. decolorans. 
24. Panicum stramineum Hitche. & Chase. 
Panicum stramineum Hitche. & Chase, Contr. U. 8. 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. 
Fic. 37.—Distribution of P. straminewm. 
Teric: Between Concepcién and Acaponeta, Rose 1889. 
MicHoacANn: Morelia, Arséne 60, 2985. 
GUERRERO: Lagunillas, Langlasse 263.) 
DISTRIBUTION. 
Rich bottom lands and damp soil, Arizona 
to Michoacan. 
Guaymas. 
The type specimen from 
Sonora: Guaymas, Palmer 168a and 
206 in 1887. 
Stnatoa: Culiacdn, Palmer 1538 in 
1891. Between Rosario and Aca- 
poneta, /tose 1878, 1883. 
Duranco: Durango, Hitchcock 7658. 
Acaponeta, Rose 3281. 
' In the Revision this specimen was doubtfully referred to P. filipesScribn. (Contr. 
U.S. Nat. Herb. 15: 74. 1910). 
