(Mass XXI. Order III. 



MONCECIA. 

 BMftDRIJl. 



246, LEMNA, 

 LEMNA MINOR. L. Duck meat, 



Leaves sessile, nearly flat on both sides ; root 

 solitary. L. 



This minuce plant, resembling a small floating scale, multi- 

 plies extensively in stagnant ponds and ditches, frequently giv- 

 ing a green appearance to their whole surface. The leaves, 

 which constitute most of the plant, cohere two or three togeth- 

 er, are small, ovate, entire, smooth, and slightly convex under- 

 neath. Root long, solitary, undivided, terminating in a small 

 sheath, Flowers minute, proceeding from a marginal fissure. 



TRUNDRIA. 



247. ERIOCAULON. 

 KRIOCAULON PELLUCIDUM. Mich. Transparent Pipewort* 



Glabrous ; leaves subulate, channelled, pellu- 

 cid, five nerved ; stem solitary ; head somewhat 

 apple-shaped; involucre hardly distinct, with oh 

 tuse scales. Mich. abr. 



Sijn. ERIOCAULON sEpfANGULARE? S?n. 



Found in ponds, growing under water, a part of the stem 

 only projecting above the surface, and supporting a small, flat, 

 head of obscure flowers. The whole plant appears made up ol' 

 a mass of cells, whose reticulated appearance is very obvious, 

 particularly in the root. The leaves grow in a tuft at the bot- 

 tom. They are one or two inches long, narrow, tapering to a 



