MUSTARD FAMILY. Cruciferas. 



A species naturalized from Europe, and 

 Common Whit= ^ , , , . \ 



I =erass common throughout our range in barren 



Draba verna fields and beside the road. The four white 

 White petals are deeply notched ; the small hairy 



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

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

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

 leafless, and smooth above but a trifle hairy below. 

 1-5 inches high. 



A common aquatic plant, much prized 

 Watercress . .^ 4. /^ ^- 1 1 • u 



Nasturtium of- ^^^' ^^^ pungent-tastmg young leaves, which 

 ficinale are smooth, dark green, or brownish green 



White in spring, and lighter green in summer. 



April-August ^pj^g insignificant 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. Natuj-alizcd 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= "^ , . ^ ^ .in t^, 



^i.ggg everywhere, but naturalized from Europe 



Nasturthim ter- in the seaboard States ; indigenous in the 



restre west. The leaves ornamentally cut, of 



Yellow usually seven segments. Pods oblong, 



ay- ugus ^\)^yy^l equaling the length of the stems. 



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



Neb. 



A coarse species well known for the im- 



^Ztultfx!m mensely strong peppery quality of i ts large 



Armoracia white roots which furnish a favorite spring 



White table relish. The oblong leaves toothed, 



June-August ^^^^ 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 



