60 Muhlenbergia, Volume 4 . 
they were obliged to stop without grass for their horses. But 
in the morning (19th) some tolerable pasturage was found by 
following up the stream. In the afternoon, continuing the same 
course, they reached another stream, which they followed up, 
‘Gn hopes to find another patch like that of the previous camp. 
This could have been none other than Sheep creek, but, true to 
its present character, they found “nothing but rock and sand.” 
Pinus monophylla was seen, but no longer grows there. 
The 2oth was an eventful day. After a march of 18 miles, 
over a difficult country, “a general shout announced that we had 
struck the great object of our search—the Spanish trail.” Evi- 
dently this was at the summit of Cajon Pass, through which 
passed the trail from the mission settlements in southern Cali- 
fornia to Santa Fe. Every spring it was traversed by a great 
caravan of horses and mules. They had been steering their 
course from point to point as best they could; they now had a 
path to guide them. The jaded mules quickened their pace, 
“and in 15 miles we reached a considerable river, timbered with 
cottonwood and willow, where we found a bottom of tolerable 
grass.” The Spaniards, Fremont tells us, ‘called it the Rio de 
las Animas, but on the map we have called it the Mohahve 
river,” from the name of a tribe of desert Indians. He may, 
therefore, be considered as the first bestower of the present name 
of the river. They must have encountered it near its exit from 
the mountains, probably at the present Las Flores ranch. 
Here the party rested for a day to refresh the wearied ani- 
mals, and the three following days they traveled down the Mo- 
jave river, apparently as far as the subsequent site of Camp 
Cady. Along the river Fremont collected the type specimens 
of Necolettia occidentalis, Franseria dumosa, Anisocoma acaulis, 
Flymenoclea Salsola, Coleogyne ramostssima, Lepidium Fre- 
monii, and the imperfect fragment which is the partial type of 
Chaenactts Fremontit. ‘They are all still abundant in the region 
there traversed. The type of Amphiachyris Fremonti is also 
