1. Utricularia fibrosa Walt. Fig. 1, Map 1 



Rare in pools, wet peat, and long sandy shores of southeastern 

 Massachusetts. This species is easily confused with U. biflora, but is 

 more robust and has two distinct branch types, one with bladders and 

 one without. Range extends from southeastern Massachusetts and 

 central Connecticut south along the Coastal Plain to Florida and 

 along the Gulf Coast to eastern Oklahoma and eastern Texas; 

 California. 



Rare and endangered plant lists: New England, Massachusetts, 

 Connecticut 



2. Utricularia intermedia Hayne Fig. 2, Map 2 



Common in shallow water, peaty soils, and damp sands through- 

 out New England. Although more abundant in acidic waters this 

 species is often found in moderately alkaline waters. The green, leaf- 

 like branches above the substrate lack bladders, hence the plant may 

 not be readily recognized as a bladderwort until the plant is removed 

 from the substrate and the bladders observed. Range extends from 

 Greenland, Newfoundland, and Nova Scotia west to Alaska, south to 

 New England, Long Island, New York, northern Delaware, Pennsyl- 

 vania, Ohio, northern Indiana, northern Illinois, northwestern Iowa, 

 and California. 



alkalinity: mean 9.7 mg/1; range 3.5-52.5 mg/1 (17) 



pH: mean 6.7; range 5.9-7.9 (17) 



3. Utricularia radiata Small Fig. 3, Map 3 



Common in acidic waters of southern New England, widely scat- 

 tered in northeastern New England. This taxon is treated by some 

 authors as Utricularia inflata Walt. var. minor Chapm., but Reinert 

 and Godfrey (1962) regard it as a distinct species from the more robust 

 Utricularia inflata Walt, of the southeast. This taxon is easily identi- 

 fied in the flowering state, but sterile, submersed material is 

 occasionally difficult to identify. Range extends from Nova Scotia 

 and New England south along the Coastal Plain to southern Florida 

 and westward along the Gulf Coast to eastern Texas; westward 

 inland to Pennsylvania, northwestern Indiana, West Virginia, and 

 Tennessee. 

 Rare and endangered plant list: Vermont 



alkalinity: mean 7.8 mg/1; range 1.0-33.0 mg/1 (26) 



pH: mean 6.6; range 5.6-7.3 (27) 



4. Utricularia purpurea Walt. Fig. 4, Map 4 



Common, free-floating in acidic waters of eastern and southern 

 New England, rarely in moderately alkaline waters. This species 

 often flowers sporadically in many populations while flowering regu- 



