336 FLORIDA GEOLOGICAL SURVEY-THIRD ANNUAL REPORT.
ANONACEAE. Pawpaw or Custard-apple Family. Anona glabra L. Pond or Custard Apple.
A sub-tropical fresh-water swamp plant, common around 'gator-holes in the Everglades, along the streams running out of the 'Glades, etc. It forms some peat, but generally grows in places which are not well adapted for large accumulations of it.
South Florida and the West Indies.
CERATOPHYLLACEAE. Ceratophyllum demersum L.
Chiefly confined to gently flowing calcareous water, such as the runs of large limestone springs. Grows entirely submerged. I have noticed it in Holmes, Wakulla, Duval, Citrus, Lake and Orange Counties.
Widely distributed in the northern hemisphere.
BATIDACEAE.
Batis maritima L. Salt-water Pursley.
In shallow salt marshes, etc., along the whole length of the Florida coast, wherever conditions permit the formation of such marshes. Commonly on bare sand or rock, where no peat forms.
Georgia to Venezuela, along the.coast.
AMARANTACEAE.
Acnida australis Gray. Careless. (PLATE 26.1)
In large fresh or brackish marshes, especially where the water or soil is a little calcareous, as in the Everglades and some of the saw-grass marshes of the lake region. Not abundant. Sumter, Lake, Orange and Dade Counties.
Southeast Georgia (?) to the West Indies and Mexico, mostly near the coast.
CHENOPODIACEAE. Goosefoot Family. Salicornia ambigua Mx. Samphire.
Has just about the same habitat and local distribution as Batis.
Massachusetts to Texas, along the coast.
POLYGONACEAE. Buckwheat Family.
Coccolobis uvifera Jacq. Sea Grape.
A characteristic tropical shore plant, growing usually on rock or sand, but occasionally also on peat in mangrove swamps. Dade and Monroe Counties.
South Florida to Brazil.
Polygonum hirsutum Walt.?
Abundant in saw-grass marshes near Eldorado, Lake County.
South Carolina to Florida.