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[[underlined]] May 5 [[/underlined]] Daylight came about 1 hour east of Colorado City on T.P. R.R. out on level, smoothe mesquite plain which continues with little interruption westward, becoming gradually more arid.
From Big Springs to the Pecos Valley the country along the R.R. rises and falls slightly with the tops of the ridges bare grass land & the lower levels mesquite covered plain. I am disposed to consider the open grass plain upper & the mesquite plain Lower Sonoran zones, but will get more data on the subject before the season is over. On most of the tops of the ridges there is a little, very much dwarfed mesquite.
At about 30 miles west of Odessa the country begins to descend & a full set of Lower Sonoran things begin - [[underlined]] Larrea [[/underlined]], [[underlined]] Koeberlinia [[/underlined]], [[underlined]] Yucca baccata [[/underlined]], [[underlined]] Opuntia arborescens [[/underlined]], [[underlined]] Zizyphys [[/underlined]], etc - and [[underlined]] Dipodomys spectabilis [[/underlined]] & [[underlined]] Amphispiza bilineata [[/underlined]].