225] FLORA OF COLUMBIA AND VICINITY b^ 



Class 2. ANGIOSPERMAE. 



Subclass I. UONOCOTYLEDONEAE. 



Order 5. PANDANALES. 

 Family 5. TYPHACEAE J. St. Hil. Cat-tail family. 



15. TYPHA L. Cat-tail. 



21. T. latifolia L. Common cat-tail. 



Swamps, swales, and edges of ponds and lakes; common. 

 North America: Europe and Asia. 



Order 6. HELOBIALES. 



Family 6. POTAMOGETONACEAE Aschers. Pondweed 

 family. 



16. POTAMOGETON L. Pondweed. 



22. p. fluitans Roth. [P. Lonckites Tuckerm.]. 

 Ponds; local. 



New Brunswick to Florida and west to the Pacific. 



23. P. hybridus Michx. [/". diversifolius Raf.]. 

 Ponds; frequent. 



Maine to Nebraska; Florida to Texas. 



24. P. pusillus L. 



Ponds; scarce. 



New Brunswick and North Carolina across the conti- 

 nent. 



25. P. Hillii Morong. 

 Ponds; common. 



New York to Michigan; Missouri. 



Family 7. NAIADACEAE Lindl. Water nymph family, 



17. NAIAS L. Water nymph. 



26. N. flexilis Rostk. & Schmidt. 

 More's lake. 



North America: Europe. 



