81 



Common name: 



Water-cress . 



Srue water-cress . 

 Distribution and habitat: 



Naturalized from Europe. U. S. and southern Can- 

 ada. Brofeks, streams, ditches; escaped from cultiyation* 



PI. Mon. Co.: "Cold streams, ditches, springy 

 places; abundant". PI. Buf. Vic: "Rather rare"; 3 sta- 

 tions. C. F.:" Spring -brooks, etc. Abundant in the dit- 

 ches from the springs in Ithaca Tillage. Indian Spring, 

 etc." Loc. Herb.: 5 sheets, but only one from Cayuga 

 flora - "Ithaca Plats". 



Found and collected by the writer as follows: 



1. Forest Home, stafpiant arm of Fall Cr. 



2 . Renwlck, ditch. 

 Diagnosis and yariation: 



flardamine pennsylvanica , which is rery similar In 

 many ways, is a much more slender plant, mostly erect, 

 not truly aquatic, flowering several weeks earlier. Up- 

 right shoots of R* nasturtium-aquaticum (Loo* Herb.) may 

 look much like large specimens of the former species, 

 but are likely to be much stouter, with larger leaflets. 

 !fhese upright shoots are strikingly different in aspect 

 from some floating ones, idiiloh are long and rather slender. 



