TRANSACTIONS OF WAGNER 
VEGETATION OF SOUTH FLORIDA 
82 
where the rush-grass, Juncus Roemerianus Scheele, of a deep, brownish-green 
color, is dominant, associated with Cyperus sp., the tall fern, Acrostichum 
aureum L., sea-lavender, Limonium sp., Phyla nodiflora (L.) Greene and a 
climbing apocynaceous plant, Rhabdadenia biflora (Jacq.) Muell. Arg. The 
margin of the salt marsh shows the presence of Sabal palmetto (Walt.) К. & S., 
Yucca aloifolia L., buttonwood, Conocarpus erecta L., which constitute the 
tree vegetation conspicuous across the open marsh as a boundary line. The 
shrubby associates of the trees that break the sky line are Myrica (Morella) 
cerifera L., Baccharis glomeruliflora Pers. with broad leaves, and B. angusti- 
folia Michx., with narrow leaves, while Borrichia frutescens (L.) DC. lines 
the space between the fringing thicket and the open salt marsh. Instrumen- 
tal readings on this salt marsh on a bright sunny, but sultry day—on June 
4, 1912—gave at 11 A. M. the following data: 
ahn mmm А ех 72% 
ТЕШ ШТАН ORME Wacky ß re go D, wo 
A thunderstorm which came at 12 M. caused the temperature to drop to 78? F. 
in twenty minutes. 
The salt marsh facies, although perhaps controlled by fresh water, occurs 
along Hancock Creek, which empties into the Caloosahatchee River on the 
north bank of that river, opposite Ft. Myers. The reason for including this 
marsh vegetation with that of salt marshes is because of the dominancy of the 
coarse rush-grass, Juncus Roemerianus Scheele, which in pure association edges 
the stream, while in other places it is fronted by the tall tropic fern, Acrostichum 
aureum L. This type of marsh extends back to the sinuous line of the pine 
forest fronted by the palmetto in an almost unbroken strip. Itis characteristic 
for the palmetto hammocks to stand in front of the pineland and on the salt 
marsh side. "There are single palmettos in the salt marsh here and detached 
clumps of them nearer the pines. Typha angustifolia L. forms associations 
touching the bank of the creek, as also the elder, Sambucus canadensis L., as 
a synantherocarpic plant on June 17, 1912. The red-mangrove, Rhizophora 
mangle L., is a border tree, as also the custard-apple, Annona glabra L. As- 
cending the creek, this vegetation gives way to pineland and hammock land. 
SAND-PINE FORMATION (ROSEMARY SCRUB) 
On the east coast of Florida are rolling sand plains and sand hills with 
broad swales filled with shallow lakes, wet prairies, cypress swamps and flat 
