A GUIDE AND KEY TO AQUATIC PLANTS 101 



territory. The related C. torta Boott is found in our territory but 

 was not included because it does not inhabit still waters. 



2. C. vulpinoidea Michx. — Moist places, various provinces over 

 most of our territory. 



3. C. decomposita Muhl. — Rare species, various provinces, south 

 to Florida. Collected from logs in Reelfoot Lake, Tennessee, by the 

 senior author. 



4. C. tribuloides Wahlenb. — Various provinces over all of our 

 territory. 



5. C. alata Torr. — Supposed to occur mostly along the coast or in 

 calcareous regions mostly in the Coastal Plain, over all of our territory. 



6. C. longii Mackenzie — Coastal Plain, apparently prefering acid 

 situations, should be found in most of our states. 



7. C. albolutescens Schk. — Range includes all of our territory. 



8. C. crus-corvi Shuttlw. — Enters our territory from the west 

 but is found all the way to Florida, seems to prefer neutral soils. 



9. C. stipiata Muhl. — This includes also variety maxima Bailey 

 which is the frequent form in our territory. Occurs in neutral soils 

 and has been collected from alluvial areas. 



10. C. laevi-vaginata (Kukenth.) Mackenzie — Should range over 

 most of our territory but has not been noted by the writers. 



11. C. cherokeensis Schwein. — Swamps, Coastal Plain, Florida to 

 Georgia and westward. 



12. C. barrattii Schwein. & Torr. — Said to occur in very acid swamps 

 and bogs, Coastal Plain, south to North Carolina. 



13. C. buxbaumii Wahlenb.— Said to occur in swamps in calcareous 

 regions, various provinces, south to Georgia. Neither this nor the 

 preceding species has been noted by the ■writers. 



14. C. joorii Bailey- — Coastal Plain, Florida to South Carolina and 

 westward in acid cypress ponds and swamps. 



15. C. verrucosa Muhl. — Coastal Plain in acid ponds and swamps, 

 distribution almost identical to preceding in our territory. 



16. C. glaucescens FAl. — Acid ponds and swamps. Coastal Plain, 

 perhaps more common than the two preceding species. Range 

 similar, but found northward to Virginia. 



17. C. walteriana Bailey — Acid ponds and swamps, Coastal Plain, 

 in the eastern part of our territory south to Florida. A related species 

 C. lanuginosa Michx. may enter our territory in the north. 



18. C. hyalinolepis Steud. — Neutral swamps over most of our area. 

 The closely related C. riparia Curtis variety lacustris (Willd.) Kukenth. 

 enters our territory in Tennessee. 



19. C. collinsii Nutt. — Very acid swamps, Coastal Plain, in the 

 eastern portion of our range from Georgia north. 



