A GUIDE TO THE WILD FLOWERS 273 



838. Common Wormwood. Artemisia Absinthium. Some- 

 what woody at the base, and 2-4 ft. high. Leaves pale, much 

 divided, but the segments not thread-Hke. Flowers greenish- 

 yellow, much as in No. 837, but the clusters of heads more 

 open, not so profuse. In waste places. Newfoundland to No. 

 Carolina and westward, mostly as an escape from gardens. 

 July-October. 



839. Flowers white, or dirty white. 



Juice milky Pilewort no. 840 



Juice not milky 



Foliage not covered with white felty hairs Prideweed no. 841 

 Foliage covered above or below, or on both surfaces with 

 white felty hairs 

 Leaves mostly basal, a few on the stem 



Basal leaves 2-5 in. long Pussy-toes no. 842 



Basal leaves less than 2 in. long .... Cat's-foot no. 843 

 Leaves all on the stem, none basal 



Plant prostrate, or nearly so Mouse-ear no. 844 



Plants erect, 1-2 ft. high 

 Flower cluster usually flat-topped; plant not aromatic 



Pearly Everlasting no. 845 



Flower cluster usually not flat-topped ; foliage with 



an odor suggesting Slippery-elm 



Sweet Balsam no. 846 



840. PiLEWORT. Erechtites hieracifolia. A coarse, milky 

 juiced herb, 1-6 ft. high, frequently following forest or brush 

 fires. Leaves lance-oval, essentially stalkless, 2-8 in. long, 

 usually regularly toothed, but occasionally deeply cut also. 

 Flowers tubular, whitish, in erect heads, which are in open, 

 rather sparse clusters. In open places. Newfoundland and 

 Ontario to Florida, and westward. August. Fig. 840. 



841. Pridkweed. Lcptilon canadcnse. {Erigcron canadensis.) ■'p;^ 

 A very common weed, 6 in.-8 ft. in height, depending upon (^j^ 

 the richness of the soil, much branched in big plants. Leaves 

 alternate, 1-4 in. long, mostly linear and toothless, hairy on 



the margins. Flowers a dirty white, in small heads, of which 

 there are, in large plants, great numbers in much branched 

 clusters. In waste places, almost throughout North America, 



