68 PUBLIC HEALTH BULLETIN NO. 2 86 



ISOETACEAE Quillwort family 

 1. Isoetes L. 



/. Jlaccida Shuttlw. Quillwort — Limesink ponds and other situa- 

 tions, Coastal Plain, South Georgia, and Florida. There are two 

 varieties distinguishable in fruiting condition. There are several 

 additional species of this genus in our territory, but only the above 

 is likely to be encountered in mosquito work. 



GYMNOSPERMAE 



PINACEAE Pine famUy 



1. Pinus [Tourn.] L. 



P. serotina Michx. Pond-pine — Acid ponds and swamps, Coastal 

 Plain, Florida north to beyond the limits of our territory and west at 

 least to Alabama. 



2. Taxodium L. C. Rich. 



T. distichum (L). L. C. Rich. Cypress — This species, with two- 

 ranked spreading needles, has a well-marked Coastal Plain variety 

 with appressed needles (variety imbricarium (Nutt.) Sudw.) The 

 variety with appressed needles is particularly characteristic of acid 

 ponds in the Coastal Plain, whUe the typical plant is found over all 

 our area (except the Piedmont and mountains) and reaches its best 

 development in river swamps. 



ANGIOSPERMAE 



TYPHACEAE Cattail famUy 



1. Typha [Tourn.] L. 



1. Leaves flat; inflorescence with staminate and dark 1. T. latifolia. 

 brown pistillate portions separated; pollen of simple 

 grains. 



1. Leaves rounded on back; inflorescence with staminate 2. T. anguslifoUa. 

 and light brown pistillate portions usually contig- 

 uous; pollen grains grouped in 4'8. 



.1. T. latifolia L. Broad-leafed Cattail — Common over all our terri- 

 tory. Anopheles quadrimaculatus often found associated. 



2. T. angustifolia L. Narrow-leafed Cattail — Characteristic of 

 aquatic situations along the coast, very local inland, much less com- 

 mon than the preceding. 



SPARGANIACEAE Bur-reed family 



1. Sparganium [Tourn.] L. 



L Achene fusiform, the body stalked; stigma 1 1. S. americanum. 



I. Achene obpyramidal, cut nearly square across top; 2. S. eurycarpum. 

 stigmas 2 



