UMBELLIFEROUS TRIBE. 



HELOSCIADIUM NODiFL<5nuM (Procumbent Marsh-wort). 



9. HELOSCIADIUM (Marsh-wort). 



1. H. nodifldrum (Procumbent Marsh- wort). Stem 

 prostrate and rooting ; leaves pinnate ; leaflets egg- 

 shaped, serrated ; umbels on very short stalks, opposite 

 the leaves. In ditches and rivulets; abundant. .A 

 plant with somewhat of the habit of Water-cresses, in 

 company with which it often grows, and for which it 

 is sometimes mistaken. It may be distinguished, when 

 out of flower, by its serrated and somewhat pointed 

 * leaves, and by its hollow stems. The flowers are small 

 and white. Fl. July, August. Perennial. 



* H. repens is a smaller plant, and has narrower 

 leaves, but is scarcely a distinct species : H. inundatum 



