ROSE AND STANDLEY—-PLANTS FROM THE PINACATE REGION. 7 
obtained. A general discussion of the principal facts as to the dis- 
tribution of the plants has been published by Doctor MacDougal in 
the Year Book of the Carnegie Institution of Washington for 1908 
and a fuller treatment in the Bulletin of the American Geographical 
Society for December, 1908, and in The Plant World for May and 
June, 1908. The data respecting the animal life of the region obtained 
by Dr. W. T. Hornaday and Mr, J. 8. Phillips have been published 
under the title of ‘‘Camp-Fires on Desert and Lava” by Doctor 
Hornaday, a most delightful book dealing with the experiences of 
the naturalists on the expedition, illustrated with many plates 
showing characteristic desert shrubs and trees. 
The botanical collections, although small, have proved to be most 
interesting, as was to be expected from an unexplored region, Several 
of the plants appear to be new and these are here described. Some 
of those already known are noteworthy, representing forms seldom 
collected. No botanical collector had ever visited the Pinacate 
region. At Sonoyta asmall collection was made by Dr. KE. A. Mearns 
in 1894. A list of his plants will be found in Bulletin 56 of the 
U.S. National Museum. 
The photographs here reproduced were taken by Dr. MacDougal, 
and these with the line drawings are the gift of the Carnegie Institu- 
tion of Washington. 
LIST OF PLANTS, WITH DESCRIPTIONS OF NEW SPECIES. 
Aristida bromoides H. LB. K. Nov. Gen. & Sp, 1: 122. 1815. 
Type locality, ‘In montibus regni Quitensis, juxta Tambo de Guamote et Llanos 
de Tiocaxas, alt. 1600 hexap.”’ 
Quitovaquito, November 11, 1907, MacDougal. 
Aristida californica major Vasey, Proc. Calif. Acad. IT, 2: 212. 1889. 
Type locality, Magdalena Island, Lower California. 
MacDougal Pass, Pinacate Mountains, November 14, 1907, MacDougal 32. 
Bouteloua polystachya Torr, U. S. Rep. Expl. Miss. Pacif, 5: 366. 1853. 
Chondrosium polystachyum Benth. Bot. Voy. Sulph. 56. 1844. 
Type locality, ‘Bay of Magdalena,” Lower Cali fornia. 
Papago Tanks, November 17, 1907, MacDougal. 
Cenchrus palmeri Vasey, Proc. Calif. Acad. IT. 2: 211, 1889. 
Type locality, ‘‘Guaymas, Mexico.”’ 
Sand hills near the Adair Box, November 20, 1907, Sykes 58. 
Heteropogon contortus (L.) Beauv.; Roem. & Schult. Syst. 2: 836. 1817. 
Andropogon contortus L. Sp. Pl. 1045, 1753, 
Type locality, ‘In India.”’ 
Papago Tanks, November 17, 1907, MacDougal 52. 
Leptochloa mucronata pulchella Scribn. Bull. Torrey Club 9: 147, 1882. 
Type locality, “Santa Cruz Valley, near Tucson.”’ 
Papago Tanks, Pinacate Mountains, November 17, 1907, MacDougal 40. 
