74 PUBLIC HEALTH BULLETIN NO. 286 



2. S. platyphylla (Engelin.) J. G. Smith. Swamp-potato — Found 

 only in the western part of our territory, most abundant along the 

 lower Mississippi River. 



3. S. subulata (L.) Buchenau — The representative of this species 

 most likely to be found in southeastern fiesh water habitats is var. 

 natans J. G. Smith. Has not been collected by the writers. 



4. S. Jiliformis J. G. Smith — Ponds in Alabama, Florida, and 

 possibly the Carolinas. It has not been noted by the writers. 



5. S.Jalcata Pursh — Similar to the following two species. Collected 

 from ponds and marshes along the Georgia coast. 



6. S. lancifolia L. — The giant Sagittaria of the Everglades, often 

 grows higher than a man's head. Should be found only in the southern 

 part of our territory. 



7. S. angustifolia Lindl. — Georgia to Louisiana in swamps, not 

 noted by the writeis. 



8. S. teres S. Wats. — This small Sagittaria with imperfectly de- 

 veloped leaves has been collected by the senior author from the edges 

 of open, acid limesinks in southwest Georgia. Its published range is 

 South Carolina to Massachusetts, 



9. S. isoetijormis J. G. Smith — Said to occur in Georgia and Florida 

 in the Coastal Plain. 



10. S. cycloptera (J. G. Smith) C. Mohr — Swamps in the Coastal 

 Plain, Florida to South Carolina and westward along the Gulf of 

 Mexico to beyond the limits of our range. 



11. S. mohrii J. G. Smith^Coastal Plain, Florida to Georgia and 

 Mississippi in ponds. 



12. S. graminea Michx.— This narrow-leafed Sagittaria should range 

 over most of our territory. 'Has been noted often. 



13. S. chapmanii (J. G. Smith) C. Mohr — Strictly Coastal Plain 

 in distribution, Florida, Georgia, and Alabama. 



14. S. macrocarpa J. G. Smith— Ponds, South and North Carolina 



15. S. rigida Pursh— Well distributed species, probably not com 

 mon in our territory, although said to occur south to Florida. Forma 

 elliptica (Engelm.) Fernald has broad and sometimes lobed leaves. 



16. S. latijolia Willd. — Most abundant and one of our most variable 

 species, found in some form over all of our territory. Variety puhes- 

 cens (Muhl.) J. G. Smith is hairy on the bracts, sepals, and inflores- 

 cence rachis and is primarily Coastal Plain in distribution. Variety 

 obtusa (Muhl.) Weigand has the leaf tap blunt or rounded. Forma 

 gracilis (Pursh) Robinson has very narrow leaf -lobes. Fornia diver- 

 sifolia (Engelm.) Robinson has lobeless as well as lobed leaves. 

 Forma hastata (Pursh) Robinson has hastate rather than sagittate 

 leaves. This species has been found in association with Anopheles 

 quadrimaculatus . 



