46 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
DISTRIBUTION. 
Open sandy or stony ground, western Texas to southern California and northern 
Mexico. 
Texas: El Paso, Jones in 1884; Presidio County, Nealley in 1892. 
New Mexico: Mangas, Smith in 
1896, Metcalfe in 1897; Las 
Cruces, Griffiths 7399 in part; 
Mogollon Mountains, Metcalfe 
768; Sierra County, Metcalfe 
1294, 
Arizona: Tucson Mountains, Grif- 
Jiths 6152, 6938, 6939; Tucson, 
Griffiths 1596, 3356, 6168, 6737, 
7017, Hitchcock 3482; Santa 
Rita Mountains, Griffiths 5981, 
6894, 6990, Griffiths & Thornber Fig. 27.—Distribution of P. arizonicum. 
75, 230, 239; Santa Catalina 
Mountains, Griffiths 7143, 7148, Lemmon 3062; Sasabe, Griffiths 6929; Bowie, 
Toumey in 1896; Lowell, Pringle 465; Mescal, Griffiths 1810; Fort Huachuca, 
Wilcox in 1894; Patagonia, Hitchcock 3695; Bisbee, Mearns 1072; San Pedro 
River, Merton 1694; Cochise, Griffiths 1913; without locality, Lemmon 353. 
CALIFORNIA: Jamacha, Canby 8 in 1894. 
Mexico: San José del Cabo, Brandegee 18 in 1890; south of Nogales, Hitchcock 3637 ; 
Arroyo San Lazaro, Brandegee in 1902; Guaymas, Hitchcock 3562, Palmer 159 in 
1887 in part; Hermosillo, Hitchcock 3542; Nogales, Griffiths 6747, 6759; Loquka, 
[Lacuca?] Sonora, Griffiths 6891; Topolobampo, Palmer 250 in 1897; State of 
Chihuahua, Palmer 1 b in 1885, Pringle 487; State of Durango, Rose 2280. 
15. Panicum texanum Buckl. 
Panicum teranum Buckl. Prel. Rep. Geol. Agr. Surv. Tex. App. 3. 1866. ‘‘Austin, 
Texas.” The type specimen, in the herbarium of the Philadelphia Academy, consists 
of two overmature plants lacking the base. 
DESCRIPTION. 
Plants erect or ascending, often decumbent and rooting at the lower nodes, branching 
from the base and com- 
monly from the lower 
and middle nodes; culms 
stout, 50 to 150 cm. high, 
or in robust specimens as 
much as 3 meters high, 
softly pubescent at least 
below the nodes and be- 
low the panicles; sheaths 
softly pubescent, often 
papillose; densely ciliate, 
the lower shorter than the 
internodes, the upper usu- 
ally overlapping; ligules 
about 1 mm. long; blades 
ascending or spreading, 8 
to 20 cm. long, 7 to 15mm. 
Fic, 28.—P, texanum. From type specimen. wide, rounded at the base, 
softly pubescent on both 
surfaces, often finely papillose, panicles finally exserted, 8 to 20 cm. long, 1 to3 cm, 
