i.e.., i!M.. ! v. isjrrKA W'A —THE NVMI'.ER OF CHROMOSOMES. 



439 



21'. Sorfhus olfacewi. 



3('. Traijo^ogoii pratensis. 



X1280 



Lactuca Keiskeana 



MiVAji; Bot. Mag. Tokyo. 2H. IDl-). 

 Sonchus oleraceus. (Fig. 29) 



Isihkawa; Bot. Mag. Tokyo. 25. 1911. 

 Tragopogon pratensis. (Fig. 30) 



IsiuKAwA ; 1916, 



5* 



16 



7 



(Potamoiietonaceae) 



Zostra marina 6 



Rosenberg; Bih. Handl. Svensk. Akad. 27. 

 1901., Flora. 93. 1904. 



(INajadaceae) 



Najas marina. (=JVa/as major) 6 



Guignakd; Arch. Anat. Mikroskop. 2. 1899.. 

 Joiini. Bot. 15. 1901. 



»> M ■• 



Mi'LLER; Arch. Zellforsch. 8. 1912. 



(Butomaceaei 



Butomus umbellatus 



Holmgren; Svensk Bot. Tidskr. 7. 1913. 



(Graminaei 



Tritioum vulgare 



Overton; Vierteljahrssch. Natxirfor.sch. Ge- 

 sell. Zurich. 38. 1893. 



11-12 



12 



12 



14 



22 



16 



* The same result was ohtiiiunl iVniii ihe study independently done l>y iiiy.sell', 

 as *iio\vii in Fi^. 23. 



