106 PUBLIC HEALTH BULLETIN NO. 286 



9. X. diformis Chapm. — Swamps, Coastal Plain, Florida, Georgia, 

 and Alabama. 



10. X. serotina Chapm. — Known only from pineland swamps in 

 Florida and Mississippi. 



11. X. elliottii Chapm. — Pinelands and swamps, Florida to Virginia 

 in the Coastal Plain. 



12. X. smalliana Nash — Acid ponds, Coastal Plain, Florida to South 

 Carolina and west to the limit of our territory. Not as common as 

 the following. 



13. X.Jimhriata Ell. — Acid ponds or swamps, Coastal Plain, Florida 

 to Mississippi and northward to the limit of our ranga. 



ERIOCAULACEAE Pipewort family 



1. Eriocaulon [Gronov.] L. 



1. Flower heads, when mature, white villous at summit 2. 



I. Flower heads, when mature, brown or blackish 1. E. ravenein. 



2. Flower heads less than 10 mm. in diameter 2. E. lineare. 



when mature; scape 3-5 ridged. 

 2. Flower heads more than 10 mm. in diameter 3. 

 when mature; scape 10-14 ridged. 

 3, Sheath at base of scape surpassing leaves except when 3. E. compressum. 



plant is submerged; flowers March- April. 

 3. Sheath at base of scape surpassed by leaves; flowers 4. E. decangulare. 

 June-September. 



1. E. ravenelii Chapm. — Swamps, Coastal Plain, Florida to Mis- 

 sissippi and South Carolina. Apparently the most infrequent oi 

 the genus. 



2. E. lineare Small — Mostly in Coastal Plain pinelands but occa- 

 sionally in acid swamps or ponds, Florida, Alabama, and Georgia. 



3. E. compressum Lam. Pipewort — The species of Eriocaulon most 

 frequently found in truly aquatic situations. Occurs in acid ponds 

 in the Coastal Plain over most of our territory. 



4. E. decangulare L. — Most often found in pine-barrens but occa- 

 sionally in acid swamps, range similar to that of the preceding species. 



PONTEDERIACEAE Pickerel-weed family 



1. Heteranthera R. & P. 



1. Leaves ribbon-like ^ 1. H. duhia. 



1. Leaves broad 2. 



2. Leaves as wide as long, lobed at base 2. H. reniformis. 



2. Leaves longer than wide obtuse at both ends, _ 3. H. limosa. 



1. H. duhia (Jacq.) MacM. Water Star-grass — Ponds or lakes, 

 various provmces, over all of our territory. Apparently prefers 

 neutral or alkaline waters, and Anojjheles guadrimaculatus is some- 

 times found associated. 



