A GUIDE AND KEY TO AQUATIC PLANTS 127 



13. Capsule glabrous, the angles rounded; with two bracts 11. L. polycarpa. 



adnate to the calj'x tube near base. 

 13. Capsule puberulent, the angles square; bracts not 12. L. simulata. 

 adnate to the calyx tube. 



14. Sepals not quite as broad as long, almost as 13. L. alaia. 



long as the capsule. 

 14. Sepals broader than long, only about one-half li. L. lanceolata. 

 as long as the capsule. 



15. Capsule round, cylindric 15. L. linijolia. 



15. Capsule narrowly obpyramidal, tapered from base to 16. L. linearis. 

 apex. 



1. L. arcuata Walt. — This species is cited by Small as Ludvngiantha 

 arcuata (WaH.) Small. Occurs in marshes and ponds, Coastal Plain, 

 Florida to Virginia, often in very acid situations. 



2. L. natans Ell. — This species exists in our territory in two varieties 

 and includes both Isnardia repens and Isnardia intermedia of Small. 

 It is a Coastal Plain species and is found from Florida north and west 

 to the limits of our territory. 



3. L. palustris (L.) Ell. — Also present in our territory in two 

 varieties. More widespread than the preceding and not limited to 

 the Coastal Plain. Range includes all of our territory. It is found 

 over a wide range of acidity. Anopheles quadrimaculatus is often 

 found associated with it. This plant is given under the genus 

 Isnardia in Small. A related species of Ludwigia, L. spathulata T. & 

 G., which is a hairy species with the capsule turgid and constricted at 

 the top, is found in ponds in Middle Florida. 



4. L. alterni-folia L. — Low places over all of our territory. 



5. L. microcarpa Michx. — Coastal Plain, Florida to North Carolina 

 and Mississippi, seeming to prefer non-acid conditions. 



6. L. curtissii Chapm. — Related to the preceding, but found only 

 on the peninsula of Florida. 



7. L. glandulosa Walt. — Coastal Plain and occasionally in other 

 provinces, most frequently in alluvial areas along rivers. Range 

 includes all of our territory. 



8. L. pilosa Walt. — Hairy species, most often found in acid ponds 

 and bays, Coastal Plain, Florida to North Carolina and beyond our 

 limit in Louisiana. 



9. L. suffruticosa Walt. — Margins of acid ponds. Coastal Plain, 

 Florida to North Carolina. 



10. L. sphaerocarpa Ell. — Frequent species over all of our Coastal 

 Plain. Commonly observed by the senior author m acid, open 

 limesinks in Georgia. 



11. L. polycarpa Short & Peter — Not observed in our territory by 

 the writers, but said to be present in Tennessee. Has been seen in 

 aquatic areas along the Mississippi not far north of our areas. 



