G2 



TREES AND FLOWERS OF 



{yellow) 



{white) 



arnica 



Arnica (Arnica) . This plant, whose powerful scent 

 at once suggests its connection with the materia medi- 

 ca, is frequent in open places and along roadsides on 

 the park plateau. It has an erect stem, usually un- 

 branched, a foot or so in height; the stem and leaves 

 as well are generally somewhat rough. The leaves 

 are opposite, arrow-shaped, between two and three 

 inches long, those at the base with stalks about as long 

 as the blades. The flowers are bright yellow, sunflow- 

 er-like heads about two inches across. Blossoming 

 takes place during July and early August. 



Yarrow (Achillea) . The yarrow is one of the com- 

 monest plants in the world, being distributed through- 

 out the northern hemisphere. It is quite abundant 

 in the Park, even to the mountain-tops, in dry, gravel- 

 ly, open locations. Its height under favorable condi- 

 tions reaches fifteen to eighteen inches, though on the 

 mountains it may be a two-inch dwarf. The stem is 

 straight and stiff, with a few erect branches from the 

 upper part. The leaves, both of the stem and the basal 

 rosette^, are exceedingly finely divided; whence the 

 plant's other name, "milfoil," signifying "thousand- 

 leaf." The white flower-heads are crowded at the ends 

 of the branches into a flat or slightly rounded mass. 



