164 Bulletin 187 



(Brainerd). Forma terrestris Schlecht. Exsiccated places; fre- 

 quent. 



P. hybridus Michx. (P. diversifolius Raf.)- "South Hero," (Robbins) ; 

 "Brattleboro," (Frost); Vernon, (Grout); Willoughby, (Jesup). 



P. lucens L. Ponds; locaL 



P. uatans L. Pools and ditches; common. 



P. Oakesiaims Robbins. Grout Pond, Stratton; Lily Pond, Vernon, 

 (Grout). 



P. obtusifolius Mertens & Koch. Fairlee Lalce, (Jesup and Sargent) ; 

 Little Otter Creek, Ferrisburg, (Grout and Eggleston) ; Lewis 

 Creek, (Faxon). 



P. pectinatus L. Common. 



P. perfoliatus L. Slow streams and shallow waters; frequent. 



P. praelongus Wulf. In deep water; frequent. 



P. pusillus L. Pools and ditches; common. 



P. piisillns L., var. Stiirrockii Benn. Malletts Bay, Lake Chaniplain, 

 (Griffin). 



P. pusillns L., var. temiissiimis Mertens & Koch. Occasional. 



P. Eichardsonii (Benn.) Rydb. (P. perfoliatus, var. lanceolatus Rub- 

 bins). Lake Champlain and its tributaries; frequent. 



P. RobMnsii Oakes. Common. 



P. mtilns Wolfgang. Pelot's Bay, N. Hero, (Brainerd). 



P. strictifoliiis Benn. (P. pusillus, var. pseudo-rutilus Benn.). Lake 

 Champlain, (E. & C. E. Faxon); Orwell, (Cushman). 



P. Vaseyi Robbins. Oozy Pond, Barnet, (Blanchard). 



P. zosterifoliiis Schumacher. (P. compressus L.). Still and slowly 

 flowing water; common. 



ZANNICHELLIA. Horned Pondweed 

 Z. paliistris L. Shallow water. South Hero, (Robbins) ; North Hero, 

 (Pringle) ; Norwich, (Jesup) ; Joe's Pond, W. Danville, (Blanch- 

 ard). 



JUNCAGINACEAE. ARROW GRASS FAMILY 



SCHEUCHZERIA 

 S. paliistris L. Peaty bogs; occasional. 



ALISMACEAE. WATER-PLANTAIN FAMILY 



ALISMA. Water-plantain 

 A. Plaiitago-aquatica L. (A. subcordatum Raf.). Swales in the lower 

 altitudes; common. 



SAGITTARIA. Arrow-head 



S. arifolia Nutt. (S. cuneata Sheldon). Swales and wet shores; fre- 

 quent along Lake Champlain; Barnard Pond, (Jesup and Sargent) ; 

 Lake Bomoseen, (Button) ; Hartland, (Whiting) ; Willoughby Lake, 

 (Kennedy). 



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



S. heterophylla Pursh. (S. rigida Pursh.). Low muddy shores and in 

 shallow water; frequent. Variable. Forma flnitaus (Engelm.) 



