 . Lemna Le Duckweed. 
Plant bodyjdisceshaped. xootlets solitary, devoid of vascular tissue. 
Reproductive polthes 2, near the base of the frond. Spathe sac-like; 
inflorescence of 1 pistillate and 2 staminate flowers. Fruit ovoid. 
O¥ronds narrowed to a distinct stipe 79 plainly $-veined le trisulca 
o Fronms ovoid but not narrowed to a stipes,very 
4 obscurely s-veined 2. Le minor 
1. Le trisulca Ll. Ivy-leaved Duckweed. —————>Fronds remaining connected 
and frequently forming dense masses, oblong-elliptical or lanceolate, 
commonly 6-8 mm. long, narrowed at the base to a distinct stipe, denticulate 
toward the blunt apex; J-nerved. 
Reported from Potlatch Creek by Piper. have been unable to verify 
this references but St. John (1937) maintains it. 
2. Le minor Le Lesser Duckweed. —— > Fronds oval, or obovate, commonly 
solitary or in small clusters, <-5 mm. long, bright green above, often 
purplish beneath, convex on both surfaces, frequently with a row of papillae 
along the rather obscure mid-vein. 
Occasional in nearly stagnant pools below 5000 feet; the most common 
species. 
atheists ss atte <8 
