State of Texas, an empire in itself, comprising one-twelfth of the area of the United States, with great diversity of soil and climate, must necessarily present a corresponding diversity in plant life. When all of its immense area is thoroughly explored, it will undoubtedly yield as many or perhaps more species than are contained within the limits of Gray s Manual. As is stated in the Introduction to the Botany of the Mexican Boundary Survey, a line drawn from the Pan Handle southeast to the vicinity of Corpus Christi, divides the State into two unequal portions. The smaller eastern part is well watered as a whole, and gives rise to more luxuriant vegetation than the other, where rain is uncertain and often scanty. The flora of this eastern section, at least in its northern and eastern portions, has many species in common with the adjacent States of Louisiana and Arkansas and the Indian Territory. The larger southern and western division, in many places a veritable desert, contains many peculiar plants, found only within its limits, especially in the central portions, in the limestone foothills, and in the mountains of the extreme western part. A long the southern border, the species are essentially Mexican, intermingling in the mountain region with more northern forms found in the mountains of New Mexico, and with characteristic Texan plants. Undoubtedly the best part of the State botanically, and also the least known, is the extreme southern portion, from Corpus Christi west to Laredo and south to Brownsville. In the Mexican Boundary Survey, the statement is made that the botany of this region is too well known from various published accounts to require further details in this place. Nevertheless, the fact remains that practically we know nothing of what it contains. The bulk of Neally snew species were collected between Brazos Santiago and Rio Grande City
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