140 PUBLIC HEALTH BULLETIN NO. 2 86 



5. Coreopsis L. 



C. nudata Nutt. — Pink-flowered species found in acid ponds and 

 wet pinelands, lower Coastal Plain, Georgia and Florida. 



6. Bidens L. 



1. Flowers inconspicuous (ray-flowers wanting) 2. 



1 . Flowers conspicuous, yellow 3. 



2. Achene long-awned, awns barbed downward 1. B. frondosa. 



2. Achene short-awned, awns barbed upward 2. B. dtscoidea. 



3. Leaf-blades simple 4. 



3. Leaf-blades compound 6. 



4. Achene straight, flat, not strongly keeled, and 3. B. laevis. 

 without pale corky margins; rays 1.&-3 cm. 

 long. 

 4. Achene curved, strongly keeled, and with pale 4. B. cernua. 

 corky margins; rays not over L7 cm. 



6. Achene 6-8 mm. long, ciliate 5. B. coronata. 



5. Achene 2-4 mm. long, not ciliate 6. B. milis. 



1. B. Jrondosa L. — Damp soil, often as a weed, over most of our 

 area. 



2. B. discoidea (T. & G.) Britton — Georgia westward and northward 

 to beyond the limits of our area, in swamps and around pond margins. 



3. B. laevis (L.) B. S. P. — Range similar to the preceding, but more 

 common in the Coastal Plain. Found in swani{:s and low woods. 



4. B. cernua L. — Found mostly north of our territory, but recorded 

 from wet places in North Carolina, Georgia, and Tennessee. 



5. B. coronata (L.) Britton — Swamps, ranging over all of our 

 territory. 



6. B. mitis (Michx.) Sherff — Coastal Plain, Florida west to Mis- 

 sissippi and north to beyond the limits of our territory. 



PRINCIPAL WORKS CONSULTED IN COMPILATION OF GUIDE 



Britton, N. L. and Addison Brown. 



1913. AN ILLUSIRATED FLORA OF IHE NORTHERN UNITED STATER, CANADA 



AND THE BRITISH POSSESSIONS, ed. 2. Scribuer. 

 CoKBR, W. C. and H. R. Totten. 



1937. TREES OF THE SOUTHEASTERN STATES. University of North Carolina 

 Press, Chapel Hill. 

 Fassett, N. C, 



1940. A MANUAL OF AQUATIC PLANTS. McGraw-Hill, Ncw York. 

 Hitchcock, A. S. 



193.5. MANUAL OF THF GRASSES OF THE UNITED STATES. U. S. Department 

 of Agriculture, Miscellaneous Publication No. 200. 

 Robinson, B. L. and AL L. Fernald, ed. 



1908. Gray's nfw manual of botany. 7th Edition, American Book 

 Company, New York. 

 Sargent, C. S. 



1922. manual of the trees of north America, ed. 2. Houghton 

 Mifflin, New York. 

 Small, J. K. 



1933. manual of the southeastern flora. Science Press, Lancaster, Pa. 



