CLASSIFICATION OF ANGIOSPERMS. 



68 1 



from New York to Texas, contains thymol, thymoquinone, hydro- 

 thymoquinone, carvacrol, cymene, and limonene. 



Nepeta Cataria (catnip) is a perennial herb naturalized in 

 the United States from Europe (Fig. 373). It contains a bitter 



FIG. 374. (b) A mass of Ground Ivy (Nepeta hederacea) growing on an embankment, 



with (a) Spring Beauty (Claytonia virginica). 



principle, tannin, and an oxygenated volatile oil. Xcpcta hede- 

 racea or GROUND IVY is a creeping perennial herb with blue bilabi- 

 ate flowers and reniform leaves (Fig. 374). It contains a bitter 

 principle and volatile oil. Citnila origanoidcs, or American DIT- 



