Cytological Studies on Chrysanthemum? 



(A Preliminary Note) 



by 



Masato Tahara. 



Chrysanthemum embraces about two hundred species. But 

 in the present investigation the following ten species were used 

 as principal objects, those with asterisk being our native species. 

 Chry. arcticum, L.* 



carinatum, Schoub. 



coronarium, L. 



Decaisneanum, Matsum.* 



japonicum, Mak.* 



lav andulae folium, Mak. 



Leucanthemum, L. 



Marschallii, Aschers. 



morifolium, Ram." 



nipponicum, Franch. 

 . The materials, after an immersion into Carnoy's solution, 

 were fixed in chrom-acetic solution or chrom-osmium-acetic 

 solution, sectioned in a usual way and stained with Heidenhain's 

 iron-hamatoxvlin or safrauin-gentianaviolet-orauge. 



I. Chromosome Number. 



The chromosome numbers of Chrysauthemum species are 

 not alike. Chr. japonicum, lav andulae folium, nipponicum, Mar- 

 schallii, coronarium, and carinatum have all 9 chromosomes ; 



1) A preliminary account with certain details of the result of this investigation 

 was published in Japanese language in the Botaincal Magazin Tokyo. Vol. XXVIII 

 1914— Vol. XXIX, 1915. 



