The Southwestern Historical Quarterly, Volume 64, July 1960 - April, 1961 Page: 532
574 p. : ill. (some col.), maps, ports. ; 23 cm.View a full description of this periodical.
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Southwestern Historical Quarterly
homa and Arkansas have no counterparts in Texas; but the prin-
cipal effect of their low elevation (less than 3000 feet) is to in-
crease local rainfall, the highest annual average being sixty
inches (highest annual average in the whole region) in the
Ouachita Mountains in Polk County, southwestern Arkansas.
Aside from mountains, no other relief features occur to inter-
fere with the orderly progressive east-west change in climate due
to decreasing rainfall.
'To the north, in Oklahoma, no appreciable changes in vege-
tation are to be found. To the northeast, in extreme northeastern
Oklahoma and adjacent Arkansas, because of the increased rain-
fall in the mountains, a larger than usual proportion of woody
plants occur with no distribution in Texas. Swinging still farther
to the east, the whole of Arkansas and the northern part of
Louisiana partake more or less (in common with extreme eastern
Texas) of the environment of the Mississippi Valley, including
in southern Louisiana the Coastal Marsh, which also extends
into Texas.
So much for the geographic extent and the variations in relief
and in climate within the area covered.
In each of the following representative genera, the number of
species credited to Texas is given in the left-hand column, the
total number for the whole area in the right. An inspection of
the list conveys a good idea of the relative proportions occurring
within and without Texas, and points up the validity of citing
Texas as containing a majority of the species described, and hence
as constituting the "organic" as well as the geographic center of
the whole area.
Abies; o out of 2 Serenoa; o out of 1 Ribes; 5 out of 14
Picea; o out of 2 Yucca; 16 out of 25 Cartaegus; 32 out
Pseudotsuga; 1 out Dasylirion; 3 out of 3 of 70
of 1 Smilax; 8 out of 9 Rosa; 15 out of 25
Cupressus; i out of 1 Agave; io out of 12 Rubus; 26 out of 58
Taxodium; 2 out of 2 Populus; 8 out of 8 Viburnum; 6 out of g
Pinus; 6 out of 11 Salix; 13 out of 26 Artemisia; 4 out of 6
Juniperus; 8 out Garrya; 2 out of 2 Baccharis; io out
of io Carya; io out of 11 of 11
Ephedra; 6 out of 7 Quercus; 42 out of 53 Brickellia; 5 out of o10
Sabal; 3 out of 3 Magnolia; 4 out of 7532
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Texas State Historical Association. The Southwestern Historical Quarterly, Volume 64, July 1960 - April, 1961, periodical, 1961; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth101190/m1/575/: accessed May 1, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting Texas State Historical Association.