642 



Plants of ihe Punjab. 



WATEE PLANTS. 



Herbs Leafless. 



Petals none. 



Lemna gibba, like tho last species, but frond larger, ^-| in. diara. 



Gibbon's Duckweed, circular, flat above, convex below, ovules 2-7. 



Lemnace^. 



F. B. L vi. 556. 



The Plains to 



7,000 ft., in stagnant 



water. 



Lemna trisulca, 



Lemnace^. 

 F. B. L vi, 557. 

 The Plains, in 

 stagnant water. 



like the last species, but frond larger, |-| in,, lanceolate 

 with a broad toothed tip, not convex below, ovule one. 



Lemna polyrrhiza, 

 Great Duckweed, 



Lemnace^. 



F. B, I. vi. 557. 



The Plains to 



6,000 ft., 



in stagnant water. 



like the last species, but root fibres several, clustered, 

 frond I'l in. diam., broadly ovate or circular, both surfaces 

 nearly flat, dark green above, usually purple below, ovules 

 1 or 2. 



Wolfiia arrhiza, 

 Rootless Duckweed, 



Lemnace^. 

 F. B. L vi. 557. 

 The Plains to 

 10,000 ft., 

 in stagnant water. 



minute, like grains of green sand, root fibres none, 

 frond -^2- ii^- ^^^ l^^s in diam., upper surafce flat, lower 

 swollen, flowers consisting of one sessile anther and one 

 ovule bursting through the upper surface of the frond. 



