MUSTARD FAMILY. Cruciferm. 



... . A species naturalized from Europe, and 

 Common Whit- . , • , 



low=grass common throughout our range in barren 



Drabavema fields and beside the road. The four white 

 White petals are deeply notched ; the small hairy 



March-May lance-shaped and toothed leaves are clus- 

 tered at the base of the flowering-stems. The pods are 

 shorter than their stems, and elliptical. Flow T er-stems 

 leafless, and smooth above but a trifle hairy below. 

 1-5 inches high. 



A common aquatic plant, much prized 

 NasUirthan of- for its pungent-tasting young leaves, which 

 ficinale are smooth, dark green, or brownish green 



White in spring, and lighter green in summer. 



April- August rp ne j ns ig n i ncan t; white flowers terminate 

 the branching stems. Leaves compound with 3-9 

 roundish leaflets. The scientific name is from nasus, 

 nose, and tortus, twisted, in reference to its stinging 

 effect upon the nose. Naturalized from Europe. 4-10 

 inches high. In brooks and small streams everywhere, 

 except in the northernmost parts of our range. 



A yellow-flowered species common 



Marsh Water- J *^ 



cress everywhere, but naturalized from Europe 



Nasturtium ter- in the seaboard States ; indigenous in the 



restre west. The leaves ornamentally cut, of 



Yellow usually seven segments. Pods oblong, 



about equaling the length of the stems. 



1-3 feet high. In wet situations. Found at Lincoln, 



Neb. 



A coarse species well known for the im- 

 Horseradish . ... „ ., . 



Nasturtium mensely strong peppery quality of its large 

 Armoracia white roots which furnish a favorite spring 



White table relish. The oblong leaves toothed, 



June-August an( j roughly veined, the basal ones large. 

 The small white flowers rather conspicuous. Pods nearly 

 round. Escaped from cultivation, into moist ground 

 everywhere; naturalized from Europe. 20-30 inches 

 high. 



170 



