30 Class III. Order III. 



39. PROSERPINACA. 

 PROSERPINACA PALUSTRIS. L. Spear leaved Proserpinaca, 



Lower leaves subpinnatifid or cut-serrfjfe ; the 

 rest linear-lanceolate, sharply serrate. Jllich. 



An aquatic, remarkable for its very hard, triangular, axillary 

 fruit. The leaves stand alternately on the 'stem, are narrow, 

 pointed, with very acute serratures. When the plant grows in 

 the water, its immersed leaves are cut into linear segments. 

 Flowers two or three in the axil of eaqh leaf. Nut bony, three 

 sided, three celled. Found in meadows and ponds. June, Ju- 



