8 FLORA OF VERMONT 



P. Nuttalli, Cham. (P. Pennsylvanicus, Cham.) Common. 



P. Oakesianus, Bobbins. Grout pond, Stratton; Lily pond, Vernon, Grout. 



P. obtusifolius, Mertens & Koch. Fairlee Lake, Jesup and Sargent; Little 

 Otter Creek, Ferrisburgh, Grout and Eggleston ; Lewis Creek, Faxon. 



P. pectinatus, L. Common. 



P. perfoliatus, L. Common. 



P. perfoliatus, L. var. lanceolatus, Robbins. Lake Champlain and tributaries; 

 frequent. 



P. praelongus, Wulf. In deep water; frequent. 



P. pusillus, L. Common. 



P. Robbinsii, Oakes. Common. 



P. Spirillus, Tuckerm. Common. 



P. Tuckermani, Robbins. Grout pond, Stratton, Grout. 



P. Vaseyi, Robbins. Oozy pond, Barnet, Blanchard. 



P. Zizii, Mertens & Koch. Alburg, Morong ; Milton, Grout. 



P. zosteraefolius, Schum. Common. 



SCHEUCHZERIA 

 S. palustris, L. Peaty bogs ; occasional. 



ZANNICHELLIA 



Z. palustris, L. Shallow water, S. Hero, Robbins; N. Hero, Pringle ; Nor- 

 wich, Jesup; Joe's Pond, (W. Danville,) Blanchard. 



ALISMACEAE. WATER-PLANTAIN FAMILY 



ALISMA. Water-plantain 

 A. Plantago-aqatica, L. Swales ; common. 



SAGITTABIA. Arrow-leaf 



S. arifolia, Nutt. Swales and wet shores, Grand Isle county, Braiuerd ; 

 Barnard Pond, Jesup and Sargent. 



S. graminea, Michx. Low muddy shores of lakes and ponds ; frequent. 



S. rigida, Pursh. (S. heterophylla, Pursh.) Low muddy shores; frequent. 



S. latifolia, Willd. (S. variabilis, Engelm.) Wet places; very common. 

 Many forms of this variable plant are recognized in the monograph of 

 J. G. Smith, Sixth Report, Mo. Bot, Garden, 1895. Of these the 

 forms c. and d. as well as the type are found in Vt. 



