ALABAMA FLORA AND ITS SOUTHERN NEIGHBORS. 41 
Genera common to the flora of eastern Asia and that of Alabama—Continued. 
: . Number Number 
Claysification. of Classification. of 
genera. genera. 
Dicotyledoneae—Continued. Dicotyledoneae—Continued. 
Archichlamydeae—Continued. Sympetalae—Continued. 
Hamamelidaceae ................ 1 N epetacease...... 2.2... ese eee eens 4 
Anacardiaceae............--.---. 1 Caprifoliaceae.. 3 
THCAGORE sec sada seiemadmen:< see 1 Loganiaceae ... 2 
Staphyleaceae .........-.......2. 1 Apocynaceae ... 2 
ACCTACERE 5 oosceinsisicteaseesensien 1 Verbenaceae ... 2 
Aesculaceae . I Clethraceae .... 1 
Theaceae .... 1 Monotropaceae 1 
Ti Aas aaa ‘i Oleaceae ..... 1 
Violaceae . . 1 Symplocaceae 1 
Araliaceae ... 1 Styracaceae .. 1 
Cornaceade ........ 2. eee eee eee eee 1 Ebenaceae ... 1 
Polemoniaceae . 1 
TOCA): cmincvn cxaumeseeasenece ens 83 Rubiaceae -........ L 
Campanulacese ........--------- 1 
se henate 
. Ericaceae, Vacciniaceae ......... 7 Total. wecosuseweaysecesuree seen 35 
Carduaceae (Eupatorium 1, As- 
tereae 2) saaucesye 3 Total Dicotyledoneac ......... 118 
Cichoriaceae. .. 3 
WEST INDIES, MEXICO, SOUTH AMERICA. 
Not less than 290 genera containing nearly 40 per cent of the plants 
indigenous to the Alabama flora are represented in the West Indian 
Islands, Mexico, Central America, and more rarely in South America 
as far south as Argentina. On the western coast of the continent but 
a few genera occur which have also their home with us. The num- 
ber stated above is comprised within 22 families. About 140 species are 
common to Central America, Mexico, and the West Indian Islands. 
This relationship is most evident between the flora of that part of the 
State embraced within the Austroriparian area and the flora of the more 
elevated regions of tropical America with climatic conditions some- 
what similar to those prevailing in southeastern North America. The 
flora of the subtropical regions of Alabama exhibits faintly the fea- 
tures of the vegetation of the neighboring tropics by the presence of 
a few genera of the epiphytal plant formation (Tillandsia, Epidendron, 
Polypodium), which in the abundance and variety of its forms consti- 
tutes one of the most striking characteristics of the tropical vegetable 
world. Ascarcely stronger suggestion of tropical character in our flora 
is afforded in its arboreal vegetation by the presence of our dwarf 
palmettos (Sabal, Serenoa) with their short or prostrate trunks. Our 
deciduous-leaved trees are represented by 10 genera common to both 
regions, 2 species of oak (Quercus virginiana, Q. breviloba) and 2 
of hickory (Hicoria pecan, H. myristicaeformis) being common: to 
Alabama and the plains of northern Mexico near the Texan frontier. 
Our wax myrtle, hop hornbeam, mulberry, elm, box elder, haw, and 
sweet gum occur in the elevated regions of the eastern declivity of 
the Mexican Andes. Our evergreen magnolia is in the same region 
