114 



THE SALTON SEA. 



COMPOSITE— Continued. 



Psathyrotes ramosissima Gray. 



Frequent along washes and on detrital mesas at the 

 northeastern end of the Sink. Between Mecca and 

 Red Canon (8115), Obsidian Island (MacDougal 

 116). 

 Common in similar places in the Colorado Desert, and 

 east and south into Arizona and Lower California. 



Stephanomeria runcinata Nutt. 



A few plants at Caleb (8307). 



Occasional in the California deserts, and thence into 

 Lower California. 



COMPOSITE— Continued. 



SONCHUS ASPER Vill. 



Occasional in the cultivated parts of Imperial Valley. 

 Brawley, Imperial, Mecca (MacDougal 123), Obsi- 

 dian Island (MacDougal 31). 



Sonchus oleraceus Linn. 



Very common in the cultivated parts of Imperial 

 Valley. Brawley, Imperial, El Centro, Mecca Flats 

 (MacDougal 127). 



These two sow thistles are abundant weeds of culti- 

 vation in California, and owe their presence here 

 to the recent settlement of the valley. 



Table 31. — Appropriate altitudes of the localities, in fret. 



Agua Dulce — 17. r > 



Brawley - 115 



Caleb - 200 



Calexico — 2 



Coachella — 71 



Dixieland — 50 



Dos Palmas — 3 



Durmid - 200 



El Centro - 50 



Estellc -180 



- 195 



- 15 



- 20 



- 70 



-125 



- 190 



- 50 



Mortmere . — 175 



Figtrec John 



Holtville 



Indio 



Imperial 



Imperial Junction 



Mecca 



Meloland. 



New River at Calexico — 20 



New River at Rockwood ... — 185 



Rockwood — 100 



.Salton -200 



Seeley 



Thermal 



Travertine Rock (base). 

 Travertine Terraces. . . 



- 50 

 -130 



- 150 

 -190 



