Explanation of PI. X, 



>s!s HAYATA. 



Fis;. 1. A branch. 



O 



2. A bract on the peduncle. 



3. A fructiferous bract, seen from the inner side. 



4. The same, seen from the outer side. 



5. A premature achene. 



6. The same, in section. 



