90 



Alismaceae 



Sagittaria 



50 



Map 114 



Sagittaria rigida Pursh 



S3 



Map 115 



Sagittaria gramlnea Michx, 



restricted mostly to the lake area with a few outlying stations. It 

 has been reported in various parts of the state because, no doubt, it has 

 not been separated from Sagittaria brevirostra. It is found on the muddy 

 borders of streams, ponds, and lakes and in ditches. It is rather frequent 

 in its habitat but its habitat is more or less local. Since there has been 

 no recent revision of the genus, the general distribution is not definitely 

 known and the best that can be done is to accept that of our most recent 

 authors. 



N. B. to B. C, southw. to Fla. and Calif. 



la. Sagittaria latifolia var. obtusa (Muhl.) Wieg. (Rhodora 27: 186. 

 1925.) (Sagittaria latifolia f. obtusa (Muhl.) Rob.) Map 110. This form 

 is probably local or infrequent throughout the state. The habitat is that 

 of the species. The general distribution is not known. 



lb. Sagittaria latifolia f. gracilis (Pursh) Rob. This is a rare form 

 in our area. In 1936 I studied some large colonies on the marl border of 

 the northwest part of Crooked Lake, Steuben County. On the shore and 

 as far out as I could wade with boots, the typical form of the species 

 occurred. Beyond this, which I examined with a boat, the roots of the 

 marsh plants formed a floating mass among which the linear-lobed form 

 was frequent. Among them could be found plants with all the leaves 

 with two lobes. Others could be found where a single plant would have 

 leaves with two lobes, one lobe, and others without lobes (mere phyl- 

 lodia). 



2. Sagittaria cuneata Sheldon. (Sagittaria arifolia Nutt.) Map 111. 

 All of our specimens are from the lake area where it is local, although 

 there are no reports from the dune area. Found on the muddy or wet, 

 sandy borders of streams, lakes, and ponds and in ditches. 



N. S., Que. to B. C, southw. to Conn., Kans., N. Mex., and Calif. 



3. Sagittaria brevirostra Mack. & Bush. Shortbeak Arrowhead. Map 

 112. This plant is found probably throughout the state and is probably 



