492 BOTANICAL GAZETTE | DECEMBER 
words, the leaves face alternately east and west. On open gravelly 
prairies this is especially noticeable, as the plants are so much more con- 
spicuous when seen from the east or west than they are when seen from 
the north or south. 
Microscopic examination of the leaf of Wyethia shows the palisade 
tissue equally developed on each side. The average of a number of 
counts indicates about forty stomata to the square millimeter on the 
upper surface of the leaf and about fifty-five on the under surface. 
In comparison with the introduced Lactuca Scariola Wyethia proves 
to be a decidedly better “ compass.”— C. V. Piper, Agricultural Col- 
lege, Pullman, Wash. 
