TRANSACTIONS OF WAGNER 
VEGETATION OF SOUTH FLORIDA 
68 
which sweep past the point. The poverty of the flora may be due to these 
two conditions. 
Consultation of the phytogeographic map accompanying this mono- 
graph will show that the silicious beaches in the restricted limits that we 
have chosen for our survey south of the 27° 30’ N. latitude are limited in 
number. They extend in front of Indian River to St. Lucie Inlet. From 
the St. Lucie Inlet to Jupiter Inlet the true strand is separated in some 
places from the mainland by a narrow channel of water connecting Indian 
River with Jupiter River. In the neighborhood of Jupiter, high dunes 
occur and the channel that stretches from Indian River to Lake Worth is 
still more constricted in width. The sand strand extends on the seaward 
side of Lake Worth as a narrow coastal island. The sandy foreshore from 
Lake Worth to Hillsboro Inlet was originally united with the mainland, being 
an integral part of it, but the coast survey map of 1911 shows a canal running 
back of the whole length of this part of the coast. The same conditions exist 
from Hillsboro Inlet to Ft. Lauderdale Inlet and from there to the head of 
Bay Biscayne, where the quartz sand peninsula extends southward to Norris 
Cut, opposite Miami. South of this are found two larger islands as Virginia 
Key and Key Biscayne, the last of the barrier beaches of silicious sands. The 
keys extending south to Key West have beachesof calcareous sand and belong to 
another category. Their vegetation has not been investigated carefully by the 
writer, and hence it is not included in this monograph. Presumably on the west 
coast Anna Maria Key, Long Key, Sarasota Key, and Casey Key, as far south 
as Casey Pass, have beaches of quartz sand similar to those of Sanibel Island. 
From Casey Pass, to the head of Lemon Bay the sandy foreshore is a part of 
the mainland. Then follow a number of elongated coastal islands, such as 
Gasparilla Island, and others, as far as Boca Grande. In front of Pine Island 
Sound and San Carlos Bay extend the chain of keys to which Sanibel Island 
belongs, including Lacosta and Captiva islands. South of Punta Rassa on 
the mainland the barrier beaches, including Estero Island, extend to Clam 
Pass. The shore north and south of Naples is part of the mainland, then, 
south of Gordon Pass, a series of costal islands are found that extend to Cape 
Romano, which is the southern extremity of one of them. The coast line 
from Cape Romano to Cape Sable is deeply embayed, or indented, and from 
reliable sources I learn that the islands which fringe it are mainly mangrove 
islands without sandy beaches until Cape Sable is reached. The immediate 
