ie 
Naiadaceae, Naias Family, 
Submerged aquatics with slondcr branching stems and linear opposite 
or whorled leaves with spinulose margins, Flowers monoecious or dioecious, 
solitary in the axils. Staminate flovers consisting of a single stamen 
enclosed by a double perianths; pistillate flowers naked, consisting of a 
single pistil with 2-4 subulate stigmas, Fruit a small nutlct, 
Naias Le 
Same characters as the family, 
1, Ul. flexilis (Willd.) Rostk, & Schmidt. Stems branching, 3-20 om, tall; 
leaves flat, 10-0 mm, long, 1-2 mm, vide, ecute, the margins finely 
spinulose-scrrate under a lens; flowers monoecious, very inconspicuous, 
the staminate flower 2.5 mm. long, the pistillate 2,5-3 m., long, attenuate 
into a style which is branched at the summit; nutlet white and shining, 
tapering at each end, 5 mn, long. 
A bright green tufted plant with fibrous roots growing in shallow 
clear water of sandy shelving lake shores; abundant locally. Upper Priest 
Lake, Epling 7759; near Viola (fide St, John), Ceratophyllum, which may 
be confused with waias Ser its spinulose leaf margins, has palmately divided 
leaves, and—lLaeks- roots, 
