56 UNIVERSITY OF MISSOURI STUDIES [204 



30. P. heterophyllus Schreb. VARIOUS-LEAVED PONDWEED. 

 Near Boulder, 5100-6000 ft. (Rydberg). 



NORTH AMERICA, except extreme north: EUROPE. 



31. P. foliosus Raf. [P. pauciflorus Pursh]. LEAFY POND- 

 WEED. 



Streams and ditches east of Boulder, 5100-5500 ft. (Dan. 

 iels, 736). 



NEW BRUNSWICK to BRITISH COLUMBIA; FLORIDA to CAL- 

 IFORNIA. 



32. P. Spirillus Tuckerm. SPIRAL PONDWEED. 



Swales along railroad between Boulder and Marshall, 

 5400 ft. (Daniels, 486). Not included in Rydberg's Flora of 

 Colorado. 



NOVA SCOTIA to MINNESOTA; VIRGINIA to COLORADO. 



33. P. pectinatus L. FENNEL-LEAVED PONDWEED. 

 Owen's lake; Boulder lake, 5300 ft. (Daniels, 681). 

 NORTH AMERICA: EUROPE. 



24:. ZANICHELLIA L. 



34. Z. palustris L. MARSH ZANICHELLIA. 



Owen's lake; Boulder lake, 5300 ft. (Daniels, 682). Red- 

 rock lake, 10100 ft. (Ramaley & Robbins). 

 NORTH TEMPERATE ZONE. 



Order 8. ALISMALES. 

 Family n. ALISMACEAE D C. Water-plantain family. 



25. ALISMA L. WATER-PLANTAIN. 



35. A. Plantago L. COMMON WATER-PLANTAIN. 



Bogs west of Marshall; swales, ditches, streams, and ponds 

 east of Boulder, 5100-6000 ft. (Daniels, 424). 

 NORTHERN HEMISPHERE. 



26. SAGITTABIA L. ARROWHEAD. 



36. S. arifolia J. G. Smith. ARUM-LEAVED ARROWHEAD. 

 With the preceding, 5100-6000 ft. (Daniels, 441). 

 QUEBEC to BRITISH COLUMBIA; MAINE and MICHIGAN to 



NEW MEXICO and CALIFORNIA. 



