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[[underlined]]Cereus giganteus[[/underlined]] - encircles the foot hills of every range of mts. from where first seen near Irene, east of Tucson, the last point of mountains just before reaching Yuma. see map. On many ranges it struggles up nearly ^[[or quite]] to the tops and it reaches out over stony mesas, but rarely occurs in an open valley or on flat land. It is loaded with flowers & green fruit.

[[underlined]]Opuntia spinosa[[/underlined]] - has almost the same range as the giant cactus around the base of the mts. from Irene to the Mohawk mts. It is very abundant & very spiny is full of fruit and still has a few of its purple or crimson flowers. Is usually full of birds nests.

[[underlined]]Opuntia versicolor[[/underlined]] - first recognized at Tuscon where pale plants had yellow flowers & purple plants have crimson flowers. also around foothills at [[strikethrough]]Casa Garb [[strikethrough]] Casa Grande Station.

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[[underlined]]Casa Grande to Yuma[[/underlined]]

[[underlined]]June 9[[/underlined]] Couldn't get a team to go out to the reservoirs so took the belated train at 9 a.m. west.

The country grows dryer & barer & hotter westward to Yuma. The mountains are all low & barren & usually black rock, often without visible signs of vegetation. Apparently they are all Lower Sonoran. The Maricopas & Mohawks are the highest but just as bare & hot to the tops as any. The only important features of the journey are the beginning & ending of species.

The soil conditions have a great influence on local distribution of plants and group the species often sharply into societies of moist bottoms, dry bottoms, gravelly valley slopes, stony mesas, stony washes, foothill slopes, rocky gulches, rocky mountain slopes. Certain species of plants reappear on each of these formations as it is crossed.