CONTRIBUTIONS TO WESTKRN EOT ANY NO. 16 



of Pithecollobium duke. The ferns are Northolaena sinu- 

 ata and Hookeri. The latter spreads by underground rootstocks in all 

 directions and forms large areas often 6 feet in diameter, with single 

 stalks scattered throughout. Cheilanthes Lindheimeri abounds at the foot 

 of rocks, The ground in all directions is covered with innumerable tufts 

 of grasses which were in full bloom. Andropogon saccharoides was rather 

 common among the rocks. Bouteloua polystachya, hirsuta, bromoides, and 

 racemosa were common and mostly ripe, the spikelets making annoying 

 stickers in the stockings as they fell off as one walked through the grass, 

 and worked through to the skin. In the flat areas Leptochloa dubia was fre- 

 quent. Muhlenbergia debilis was everywhere. M. Porteri was among the 

 rocks and brush. Aristidas were very common in tufts. Epicampes dis- 

 tichophylla and rigens were frequent, particularly among the rocks and on 

 slopes. Distichopylla is a very conspicuous grass growing in big tufts 

 3-4 feet high, with its waving plumes of flowers. Eragrostis lugens was 

 still more common on slopes. Pappophorum apertum and Lycurus phleoides 

 were also common. There was an Arundo-like grass out of flower and 

 fruit, rather common among the rocks. On the plains Yucca elata was 

 common, Yucca macrocarpa was less common, but they did not extend up 

 on the mountain sides. Dasylirion erumpens was frequent among the 

 rocks. In the draws where there was some moisture Salix Bonplandiana 

 occurred along with Populus Fremonti, and Celtis occidentalis. On the 

 slopes near the water holes was Aristolochia Watsoni and Acalypha Vir- 

 ginica. Allionia incarnata was common. Boerhaavia intermedia and 

 scandens were quite common. Gomphrena nitida and Rivina phytolac- 

 coides were occasional. I was surprised to find Iresine celosioides rather 

 common. Eriogonum Wrightii was scattered over the hills. Portulaca 

 suffrutescens was quite common among the rocks. Also Talinum pnnicu- 

 latum. Euphorbia serpens, a rooting perennial, which Standley calls an 

 annual, was frequent along the sides of little draws and conspicuous from 

 its abundance of foliage and scanty fruit. Other species were E. hyperici- 

 folia, and pediculifera, and chaetocalyx. Simmondsia was scattered over 

 the hills. Cassia nictitans was rather common in open places with other 

 weeds. Erythrina was the characteristic shrub growing among the rocks, 

 along with Eysenhardtia orthocarpa and Cologania longi folia, and Phaseo- 

 lus acutifolius and tenuifolius. Dalea formosa was common, and Crotalaria 

 lupulina. Desmodium batocaulon, Metcalfi, and Neo-Mexicanum were fre- 

 quent. Occasionally I saw Philadelphus microphylla and Dodonaea viscosa. 

 Ayenia pusilla and Californica were common. Ingenhouzia triloba was 

 found now and then along stream-beds. Echinocactus acanthodes and 

 I eContei occur scatteringly. The creosote bush is everywhere. The wild 

 Muskmelon, Apodanthera, is common, as is also the climbin<* wild cucum- 

 ber, Echinopepon Wrightii. The wild ground cherry Physalis lobata and 

 Wrightii occurred. Wild morning glories were common in 3 species Ver- 

 bena perennis grew on the hills. The Mexican species Ruellia tuberosa, 

 and Parryi, and Tetramerium hispidum and Ecliptera Torreyi grew in the 

 shade of bushes. Another Mexican plant was Plumbago scandens climbing 



