xi] THE WATER PARSNIP 149 



linear segments (a in Fig, 97): secondly, compound-pinnate air 

 leaves, with each leaflet of the second degree toothed and lobed 



FIG. 97. Sium latifolium, L. Plant from Roslyn Pits, May 30, 1911, showing three 

 types of leaf: a, submerged compound-pinnate leaf with linear segments; b, erect 

 air-leaf, compound-pinnate; c and d, erect air leaves, simply-pinnate. (Reduced.) 



[A. A.] 



(b in Fig. 97); and thirdly, air leaves, once pinnate, with the 

 leaflets toothed but not lobed (c and d\n Fig. 97). Some small 

 plants were found bearing the submerged type of leaf alone. 



