The Desert in June. 25 


Larrea Mexicana,Moric. Franseria dunosa, Gray.? 
Dalea Asclepias subulata, Decsne. 
a *Eustoma exaltatum, Griseb. 
Prosopis juliflora, DC. ; Coldenia Palmeri, Gray. 
“pubescens, Bth. Eriogonum trichopodum, Torr.? 
Olmeya Tesota, Gray. Chilopsts saligna, \)on. 
Parkinsonia Torreyana, Wats. Atriplex hymenelytra, Watson. 
Petalonyx Thurberi, Gray. os =? 
Opuntia Croton———?. 
*Sesuvium Portulacastrum, L *Washingtonia filifera, Wendl. 
*Pluchea camphorata, DC. Fitlaria rigida, Thurb. 
*Baccharis Douglasii, DC.? *Distichlis maritima, Raf. 
_ Those found around the water only are marked with an aster- 
isk; those which are in italics belong exclusively to the desert 
flora. 
X.—Paciric MINING DistTRICT:—CHUCKAWALLA MOUNTAINS. 
The Chuckawalla mountains form a portion of the Colorado 
Desert, and are virtually devoid of vegetation except in the 
washes. Ai few hills support a sparse vegetation. The Pacific 
- Mining District is in the midst of these mountains or hills, where 
a much greater variety ot plants was found than on the plains of 
the desert, as will be seen by the following list: | 


Krameria ? Hyptis Emoryi, Torr, 
Fouquiera splendens, Engelm. Eriogonum trichopodum, Torr. 
Fagonia Californica, Bth. a 
Larrea Mexicana, Moric. Simmondsia Californica, Nutt. 
Dalea ; Euphorbia polycarpa, Bth. 
‘s Ephedra Californica, Watson. 
Parkinsonia Torreyana, Watson. Olneya Tesota, Gray. 
Opuntia Bigelovii, Engelm. Prosopsis juliflora, DC. 
Es Acacia Greggii, Gray. 
ab Petalonyx Thurberi, Gray. 
Cereus Engelmanni, Parry. Cucurbita Californica, Torr.?’ 
Echinocactus Wislizeni, Engelm. Mamillaria Grahamii. 
Franseria dumosa, Gray.? Nolina Bigelovii, Watson. 
Nicotiana ? Hilaria rigida, Thurb. 
Chilopsis saligna, Don. Notholaena Parryi, Eaton. 
Beleperone Californica, Bth. Echinocactus polycephalus, 
No water is found on the surface in that portion of the areas, 
visited. A few lichens were found on the ground in favorable 
situations, but none were noticed on the rocks—they may have 
been abundant without attracting my attention, however. 
The presence of the mesquite (prosopisjuliflora, D C.) is con- 
sidered an indication of water near the surface (within twenty 
feet), while the presence of pluchea borealis indicates that water 
is not over five feet from the surface. The palm is found only 
near water—usually beside springs. 7 
The general impression existed in my mind that cacti in great 
variety abounded on the Colorado Desert, asso many species are 
credited to this region. But I found them restricted almost 
