scar of the flower at its center. The two depressions on the concave side give 

 the seed a curious mask-like appearance. These depressions on the white 

 unripe seed are seen as two green swollen translucent glands. 



Yaheow or Milfoil, Achillea Millefolium, L., is a well known plant by 

 waysides and in meadows everywhere from Atlantic to Pacific. In the West 

 is a native form which occurs high up on mountains as well as on the prairies. 

 The erect stems 6 to 18 inches high, bear flat-topped clust/ers of white flower- 

 heads and finely divided fern-like leaves. The seeds [Plate 56, fig. 61 — 

 natural size and enlarged 4 times] are very small, flat and thin, gray with a 

 white margin, about yV of an inch long and oblong-wedge-shaped; 

 the basal scar is circular and distinct; the apical scar is a small cushion- 

 like prominence from the middle of the broadly notched apex. These seeds 

 are very often found among small grass seeds. 



54 



