84 



Najadaceae 



Zannichellia 



~ 50 



Map 99 



Najas flexilis (Wflld.) Rostk.& Schmidt 



o 50 



Map 100 



Najas guadalupensis (SprengJ Morong 



5 50 



Map 101 



Najas gracillima (A.Br.) Morong 



62. ZANNICHELLIA [Micheli] L. 



1. Zannichellia palustris L. var. major (Boenningh.) Koch. HORNED 

 Pondweed. Map 98. I found this pondweed to be frequent in one foot of 

 water on the southwest side of Cedar Lake, Lake County. I found it in 

 Pulaski County about 13 miles west of Winamac, in Little Monon ditch 

 where it is crossed by State Road 14. It has been reported from Wolf Lake, 

 Lake County, by Peattie and from Vigo County by Blatchley. It may be 

 more frequent in the state than our reports indicate. 



In fresh or brackish water nearly throughout North America, except 

 the extreme north ; widely distributed in the Old World. 



12. NAJADACEAE Lindl. 

 64. NAJAS L. Naiad 



[Clausen. Studies in the genus Najas in the northern United States. 

 Rhodora 38: 333-345. 1936.] 



Leaves mostly (0.4) 0.5-1 mm wide and 1-1.5 cm long, gradually widening into a 



clasping base. 



Styles (including the stigmas) filiform, 0.8-2 mm long; fruit lustrous, indistinctly 



marked with 30-50 longitudinal lines, enclosing obscure hexagonal areolae; 



leaves gradually tapering from the base into a long drawn out point, the fine 



teeth numerous 1- N. flexilis. 



Styles (including the stigmas) stouter, 0.1-0.6 mm long; fruit dull, more distinctly 

 marked with about 10-20 longitudinal lines which enclose rectangular areolae; 

 leaves linear, with a rounded or merely acute apex, the teeth not so numerous 



as in the preceding species but more conspicuous 2. N. guadalupensis. 



Leaves mostly 0.25 mm wide, ranging from 0.2-0.3 mm wide and 1.5-2.5 cm long; fruit 

 somewhat curved, dull, the surface longitudinally marked with short, oblong 

 reticulations 3. N. gracillima. 



1. Najas flexilis (Willd.) Rostk. & Schmidt. Map 99. So far as known, 

 this species is restricted to the lake area of the state. It is found princi- 

 pally in lakes and in a few rivers. A variety robusta Morong is a stouter 



