TRANSACTIONS OF WAGNER 
rap VEGETATION OF SOUTH FLORIDA 
ponds away from the coast underlaid by the Columbia and Lafayette geologic 
formations from Dismal Swamp, Virginia, to Florida and Louisiana.“ Taxo- 
dium distichum usually has an enlarged, conic, buttressed base with the 
longitudinal ridges usually flat, quite sharp and prominent. Its knees are 
large and pointed. In Taxodium imbricarium, the enlargement of the base 
is abrupt and conoidal and its ridges are rounded. The knees of this variety 
are rounded, or hemispheric, or may be entirely wanting. The leaves are 
closely appressed, while in T. distichum they are spreading and distichous. 
Small in his Miami Flora gives Taxodium distichum as the only species of the 
limestone region of Southeast Florida. As T. imbricarium is a calciphobe 
species, it is probably not represented, but in southwest Florida, about 9 kms. 
south of Ft. Myers in a cypress bay, or head (Plate IX, Fig. 1), nearly all of 
the trees had the enlargement characteristic of Taxodium imbricarium in a 
soil of sand with no evident limestone. Following Sargent, I have represented 
on my colored phytogeographic map of North America, the southern limit 
of Taxodium distichum as at Jupiter Inlet on the east coast of Florida, while 
in reality, according to later observations, it is found growing almost at the 
extreme southern end of the peninsula on both the east and the west coasts, as 
indicated on the accompanying map. The last outpost, according to the ob- 
servations of the writer, is at the edge of a prairie 16 kilometers (ro miles) 
south of Miami, between Larkin and Kendell (see map), which is about 
32 kilometers (20 miles) north of the extreme southern limit of the slash- 
pine, Pinus caribaea Morelet, on the mainland at Detroit. The writer was 
informed on good authority that the southwest limit of the cypress in Monroe 
County is fixed by the limits of the survey made by J. S. Frederick in 1902, for 
his survey ended at a point where it was impossible to penetrate the dense cy- 
press swamps. On the large blue map of Dade and Lee, also parts of Monroe, 
De Soto, and Manatee counties, Florida, the end of that survey is marked R. 34 
E. and T. P. 54 5. Dr. John K. Small has informed me that he has seen a few 
cypress trees in the neighborhood of Long Key (Everglades), and on the map 
just mentioned at the head of North and Roberts rivers, a wet prairie with 
small cypress is given, so that the cypress tree extends much farther south than 
Sargent believed; in fact, it extends to the southern end of the peninsula, but 
* Harper, Roland M.: Taxodium distichum and related Species, with Notes on some geological 
Factors influencing their Distribution. Bull. Torr. Bot. Club., 29: 383-399; Further Observations on 
Taxodium. Bull. Torr. Bot. Club, 32-105-115. 
