15 



1. Sagittaria monteuidensis Cham, and Schlect. ssp. spongiosus 

 (Engelm.) Bogin Fig. 4, Map 5 



Rare on mud flats in estuarine sites. Although the leaves are 

 typically thick spongy phyllodia, occasionally an elliptical to nar- 

 rowly-sagittate leaf may be encountered. The type station for this 

 taxon is the Merrimack River, Newburyport, Massachusetts. Long 

 known as Lophotocarpus spongiosus (Engelm.) J. G. Smith, Bogin 

 (1953) treats it in the genus Sagittaria. Range extends from New 

 Brunswick south to Virginia. 



Rare and endangered plant lists: New Hampshire, Massachusetts, 

 Connecticut, New England 



2. Sagittaria subulata (L.) Buchenau 



2a. Sagittaria subulata var. subulata Fig 5, Map 6 



Rare in tidal waters of Massachusetts and Connecticut; reported 

 from one freshwater site in Massachusetts. This plant forms small 

 rosettes of subulate leaves or plants with elongate leaves up to 30 cm. 

 Range extends from Massachusetts southward along the Atlantic 

 Coast and Gulf States to Mississippi. 



2b. Sagittaria subulata var. gracillima (S. Wats.) J. G. Smith Fig. 6, 

 Map 7 



Uncommon in rivers of Massachusetts, Rhode Island, and Connec- 

 ticut. The variety occasionally flowers, but has never been observed 

 fruiting in New England. The type locality is the Neponset River, 

 Readville, Massachusetts. Adams and Godfrey (1961) regard this 

 phase of the S. subulata complex as having strongest affinities witli S. 

 stagnorum Small; Godfrey and Wooten (1979) include it within S. 

 stagnorum in their flora. Range extends from Massachusetts south to 

 eastern Pennsylvania, Florida, and Alabama, with one location in 

 North Carolina. 



alkalinity: mean 20.3 mg/1; range 15.0-35.0 mg/1 

 pH: mean 6.7; range 6.7-6.8 



3. Sagittaria teres S. Wats. Fig. 7, Map 8 



Common in sandy acid coastal plain freshwater ponds of south- 

 eastern Massachusetts, rare inland in Massachusetts and Rhode 

 Island. The type locality is Lewis Pond, Hyannis, Massachusetts. 

 Bogin (1955) includes this as a variety oi Sagittaria graminea. How- 

 ever, based in part on the observation that this taxon of limited habitat 

 fruits abundantly in New England, while S. graminea does not, we 

 agree with Beal (1960) in maintaining it as a distinct species. Presently 

 there are 61 locations known for this species in Massachusetts. Range 



