352 FLORIDA GEOLOGICAL SURVEY-THIRD ANNUAL REPORT.
Potamogeton sp. (probably several of them). Pondweed.
In Lake Iamonia, Lake Lafayette, Lake Dora, the St. Marks River, fid various other quiet waters. There is one species in the southern part of the Everglades and the adjacent coast prairies which is probably different from any of those farther north.
TYPHACEAE. Cat-tail Family. Sparganium sp.
Around a pond about three miles northeast of Tallahassee, and in the Waccasassa River, Levy County.
Typha latifolia L. Cat-tail.
Lake margins, estuaries, large fresh marshes, etc.; not common. Escambia, Santa Rosa, Walton, Franklin, Citrus, Lake and Dade Counties.
Widely distributed in the north temperate zone, but absent over large areas.
CONIFERAE. Pine Family.
Juniperus Virginiana L. (Red) Cedar.
Mostly in low calcareous hammocks, but occasionally on poor peat, as at the mouths of the Choctawhatchee, Apalachicola and Suwannee Rivers, and on the borders of salt marshes near Titusville. Most frequent in the Gulf hammock region, but not very abundant anywhere in Florida.
Widely but irregularly distributed in temperate Eastern North America, mostly in limestone regions.
Chamaecyparis thyoides (L.) BSP. Juniper.
In sour, or at least decidedly non-calcareous, swamps in the West Florida pine hill region from Liberty County westward. Abundant on peat (often 15 or 20 feet of it) in the estuarine swamps of the Blackwater River and its tributaries in Santa Rosa County.
Maine to Louisiana, in the glaciated region and coastal plain; but rare in some of the intervening states, especially in Georgia.
Taxodium distichum (L.) Richard. (River) Cypress.
 (PLATES 20.1, 21.1, 25.1, 26.2. FIGS. 17, 26.)
Chiefly in alluvial or calcareous swamps. Widely distributed over the State, perhaps in every county. Abundant among the large lakes and saw-grass marshes of central Florida. Not usually on good peat.
Delaware to Florida, Indiana and Texas, almost confined to the coastal plain.