386 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Besides several sheets of the type collection there are in the National Herbarium 
two specimens collected by Orcutt in Lower California in 1889 and 1890 and one by 
Hayes at ‘‘Puachio,’”’ Arizona, in 1858. All of these differ only in having longer 
awns from forms of B. barbata which I know in the field. 
' 
‘ 
A 
A 
i 
4 
' 
fl 
A 
A 
4 
b 
4 
iW 
Fig. 40.—Bouteloua arenosa. a, Spikelet; b, c, lemma and palet of first floret; d, e, rudimentary second 
and third florets; f, two views and cross section of caryopsis. @, Scale 7.5; b-f, scale 20. From type 
specimen. 
HERBARIUM SPECIMENS. 
Arizona: Hayes, Puachio. Mearns 929, south of Bisbee. 
CaLtrorNia: Orcutt, Colorado Desert. 
Texas: Buckley in 1883. 
Mexico: Palmer 189, Guaymas. Jfitchcock 3534, Hermosillo. Oreutt, Lower Cali- 
fornia in 1889, 
