No. 14.] FLOWERING PLANTS AND FERNS. 20/ 



Introduced as a salad plant and worthy of propagation for 

 family use. Flowers rarely purple. 



Radicula sylvestris (L.) Druce (of woods). 

 Nasturtium sylvestre R.Br. 

 Roripa sylvestris Bess. 



Yellow Cress. Yellow Water Cress. Creeping Yellow Cress. 

 Local and rare to frequent or locally common. Moist 

 ground along rivers, and in fields, roadsides and waste places ; 

 especially common in the upper Connecticut Valley. May — 

 July, even Oct. Naturalized from Europe. 



Radicula palustris (L.) Moench (of marshes). 



Nasturtium palustre DC. 



Roripa palustris Bess. 



Yellow Cress. Marsh Cress. 



Occasional, rare or local. Wet meadows, cultivated or 



waste ground, ditches and banks of streams. June — Sept. 

 Radicula palustris (L.) Moench, var. hispida (Desv.) Robin- 

 son (rough-hairy). 



Nasturtium palustre DC, var. hispidmn Gray. 



Roripa hispida Britton. 



Hairy Yellow Cress. 



Occasional or frequent. Borders of streams and ponds, 



in ditches and wet places. June — Aug. 



Radicula Armoracia (L.) Robinson (classical name for this 



species). 

 Nasturtium Armoracia Fries. 

 Roripa Armoracia Hitchc. 

 Horseradish. 



Occasional throughout as an escape from gardens. Wet 

 fields, waste places, roadsides and ditches. Mid-May — June. 

 Naturalized from Europe. 



Roots the source of a valued condiment. 



BARBAREA R. Br. Winter Cress. 



Barbarea vulgaris R. Br. (common). 

 Barbarea Barbarea MacM. 



Common Winter, Bitter, Yellow, or Rocket Cress. Yellow 

 Rocket. 



