DESCRIPTIONS OF SOME COMMON WEEDS 



found as far south as New Mexico and west to California. 



Horehound (Marrubium vulgar e, L.). A whitish, 

 woolly, bitter, aromatic perennial with branched, ascend- 

 ing stems ; leaves petioled, round-ovate, pointed, crenate- 

 toothed; flowers in whorls; calyx with recurved, spiny 

 teeth ; corolla small, white, upper lip erect ; stamens four, 

 included in tube of corolla. Occasionally eastward. Com- 

 mon in Colorado and Utah and the Pacific coast. Very 

 common in the foothills adjacent to the Salt Lake Basin. 



Catnip (Nepeta Cataria, L.). A peren- 

 nial, erect herb, one to three feet high ; 

 leaves ovate, cordate, coarsely serrate, 

 petiolate, whitish, downy underneath ; 

 flowers in cymose clusters ; corolla whit- 

 ish, dotted with purple. Native to 

 Europe ; widely naturalized in the north- 

 ern states. 



Ground Ivy (Nepeta hederacea, (L.) 

 Trevisan). A creeping, trailing peren- 

 nial, with leaves all alike; petioled, F j g 

 round, kidney-shaped, crenate, smooth, nettle (Lamium ul- 



green on both sides ; flowers light blue bum) ' Sometimes a 

 ? i r , very troublesome 



in axillary whorls of about six, appear- wee d. (Ada Hay- 

 ing in early spring and summer. Na- den.) 

 tive to Europe, widely naturalized in the northern states, 

 especially in shady places. 



Dead Nettle (Lamium ample xicaule, L.). An annual 

 herb with rounded, deeply toothed, crenate leaves; the 

 upper leaves small, clasping; calyx tubular, five-toothed; 

 flowers small ; corolla purple, upper lip bearded, 

 the lower spotted. Common in the eastern states to 

 Missouri. The Lamium album troublesome in the East. 



Motherwort (Leonurus cardiaca, L.). Tall, perennial 

 herb with erect stem, two to six feet high ; leaves long- 

 pointed, the lower round and palmately lobed, the upper 

 crenate at the base, three-cleft; flowers pale purple in 



