118 PUBLIC HEALTH BULLETIN NO. 286 



in association with Anopheles quadrimaculatus. The pink-flowered 

 N. nucifera Gaertn. has been noted as introduced in two localities in 

 Georgia. 



RANUNCULACEAE Crowfoot family 



1. Caltha [Rupp.] L. 



C. palustris L. Marsh-marigold — May possibly come into our 

 territory in its northern part. Prefers calcareous situations. 



2. Myosurus L. 



M. minimus L. Mouse-tail — Margin? of aquatic areas, various 

 provinces, its range covering all of our territory. Apparently prefers 

 calcareous soils. 



3. Ranunculus [Tourn.] L. 



1. Leaves cut into many thread-like or ribbon-like divi- \. R. fiahellaris. 



sions. 



1. Leaves entire or lobed but not cut into divisions as 2. 

 above. 



2. Leaves narrow, nearly linear, not lobed 3. 



2. Leaves broad, deeply lobed 2. R. sceleratus. 



3. Plants perennial; stems creeping; achene with a subvi- 3. R. ambigens. 

 late beak. 



3. Plants annual; stems not creeping; achene beakless 4. 



4. Petals mostly over 3 mm. long 4. R. laxicaulis. 



4. Petals mostly less than 3 mm. long 5. 



5. Achene papillose 5. R. lindheimeri. 



5. Achene smooth ^ ^_ 6. R. piisillus. 



1. R. flabellaris'R&f. Water Buttercup —In our territory only along 

 the Mississippi River Valley in Tennessee and North Mississippi unless 

 possibly in North Carolina. This is the R. delphinifolius Torr. of 

 Small's Manual. 



2. R. sceleratus L. — Introduced species, its range including all of 

 our territory. The senior author has noted it only in aUuvial situa- 

 tions in the Mississippi River Valley. 



3. R. ambigens S. Wats.^ — Should be expected only in the northern 

 part of our territory. Listed as R. obtusiusculus Raf. by Small. 



4. R. laxicaulis (T. & G.) Darby — Moist places in the Coastal 

 Plain and occasionally other provinces, its range including all of our 

 territory. 



5. R. lindheimeri Engelm.— Ponds from Alabama westward to 

 beyond our Imiits. 



6. R. pusillus Poir. — Wet places over all of our territory. 



