112 BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



Other conspicuous plants are : 



Ephedra trifurca Torrey, and other 



species. 

 Yucca haccata Torrey. 

 Dasylirion wheeleri Watson. 

 Agave sonorw (Torrey) Mearns. 

 Amaranthus sp. 

 Rubus sp. 



Kunzia tridentata (Pursh) Sprengel. 

 Mimosa. (Several species.) 

 Acacia. (Several species.) 

 Erythrina flatelliformis Kearney. 

 Fouquieria splendens Engelmann. 

 Rhus toxicodendron Linnseus. 

 Rhus trilol)ata Nuttall. 

 Ceanothus fendleri Gray. 

 Vitis arizonica Engelmann. 



Parthenocissus guinquefolia (L i n - 

 na?us) Planchon.- 



Cereus pectinatus rigidissimus Engel- 

 mann. 



Opuntia. (Several species, of sub- 

 genera. Platypuntia and Gylindro- 

 puntia.) 



Philatertella cynanohoides (Decaisne) 



Vail. 

 Datura meteloides de Candolle. 

 StenoloUum stans (Linnaeus) D. 

 Cucurliita digitata Gray. 

 Gucurbita fostidissima Humboldt, 



pland, and Kunth. 

 Lobelia splendens Willdenow. 

 Xanthium sp. 

 Baccharis. t^everal species.) 



Don. 



Bon- 



Lieutenant Gaillard, who was in the Pajaritos Mountains during 

 the flowering season of plants, in his Report (-p. 2) observes : 



The mountains are covered with a fine growth of evergreen oak, juniper, and 

 manzanita, while magnificent walnut, sycamore, and ash trees line the can- 

 yons. Excellent grass covers the hills ; thousands of beautiful wild flowers 

 spring up on all sides during the rainy season ; game is abundant and the 

 climate unsurpassed. From the highest part of tl)ese mountains the view is 

 beautiful beyond description and stretches away for 75 or 100 miles in every 

 direction. Throughout this entire region, probably one of the roughest and 

 most cut up in North America, there are no roads and hut a few blind trails. 

 Little or no water is to be found during the dry season, except by digging, 

 although there is evidently a considerable underground drainage, as the Altar 

 River, Arivaca Creek, and Nogales Greek, all permanent streams, derive their 

 waters from the drainage of these mountains, which were notable, not only on 

 account of their beauty, but also because they constituted the last timber- 

 covered mountains encountered on the survey until the Coast Range was 

 reached, and because in them was seen for the first time the strange and 

 ungainly giant cactus {Cereus giganteus) , called " suguaro " by the Mexicans. 



STATION No. 49. — Arivaca Creek, Pima County, Arizona. This 

 station is 18 kilometers (11 miles) north of Monument No. 135, 532 

 kilometers (331 miles) west of the Rio Grande, and 327 kilometers 

 (203 miles) east of the Colorado River; altitude about 1,000 meters 

 (3,281 feet). This is a wooded stream bordered by a broad plain on 

 the north and near the foothills of the Pajaritos Mountains on the 

 south. The present writer was there during December 8 and 9, 1893, 

 and Mr. Holzner December 7, 1893. 



Station No. 50. — La Osa, Pima County, Arizona. The camp was 

 one-half mile north of Monument No. 140, 534 kilometers (332 miles) 

 west of the Rio Grande, and 325 kilometers (202 miles) east of the 

 Colorado River. Altitude, 1,100 meters (3,609 .feet). This station 

 is at the western extremity of the Pajaritos Mountains. "We camped 



