382 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
densely pubescent, 4-toothed, with 3 scabrous equal awns, about 2 mm. long; palet 
4-toothed, 2-awned, pubescent on the edges only, about 2.5 mm. long; rudiment con- 
sisting of 3 scabrous, equal awns, about 4 mm. long, together with two or three small 
scales upon a stipe about 1 mm, long, bearing a tuft of long hairs at each end; caryopsis 
obovate, pointed at both ends, about 1.3 mm. long, less than 0.5 mm. wide, the 
scutellum covering nearly the entire ventral surface, the dorsal surface convex. 
(Prats 73, A. Fraure 37.) 
The specimens cited in the original description are undersized and can scarcely 
be calléd cespitose. They differ, therefore, very decidedly from the large speci- 
mens of the Santa Rita Mountains. They also differ decidedly in color, my speci- 
mens from southern Arizona 
being much lighter. Woo- 
ton’s no. 6033 is especially 
dark colored, but this is 
easily accounted for by the 
abnormal rainfall of the sea- 
son in which it was collected. 
The rains appeared very late 
that year and continued into 
the cool season. Grasses 
often show this excessive col- 
oration when subjected to 
cooler nights than normal, 
either when growing later in 
season than usual or at high 
altitudes. The type speci- 
mens are so diminutive that 
they are really not at all rep- 
resentative of the speciesas it 
iscommonly found. Pringle 
413, Nealley 265, Lemmon 
4638, well represent the com- 
mon form of this species. 
i 
HERBARIUM SPECIMENS. 
Arizona: Mearns 11214, San 
Pedro River, Mexican 
Boundary Line. Nealley 
265, Oracle. Lemmon 
426 and 4638, “S. E. 
Arizona.”’ Griffiths & 
Thornber 206, Santa Rita 
\ Mountains. Griffiths 
Fig. 37.—Bouteloua parryi. a, Spit Fe a et of ast 1819, 3415, Mescal. 
views mn orose section of caryopsis, a, Scale 7.5; b-g, seale 125. New MeExtco: Cockerell 16, 
a-[, From Griffiths 7277; g, from Wooton 3065. Jarilla Junction, 
Texas: Scribner in 1887. 
Mexico: Schaffner 1019 and 157, San Luis Potosi. Pringle 413, Chihuahua. Wilkinson, 
Santa Eulalia Mountains, Chihuahua. Parry & Palmer 9434, San Luis Potosf. 
<= 
———— a —— 
11. Bouteloua barbata Lag. 
Bouteloua barbata Lag. Var. Cienc, 24: 141. 1805. This name has dropped out of 
recent literature, although it was correctly interpreted by Ruprecht, Roemer and 
EXPLANATION OF PLATE 73.—A. A clump of Bouteloua parryi consisting of several plants with those, 
around removed. In situations like this, where many plants are found together, the habit is different from 
that wherein it grows in more isolated scattered bunches. B. An unusually large isolated tuft of Bouteloug 
barbata, Adamana, Arizona. 
