358 Unwersiiy of Califomiu Publications in Agricultural Sciences [Yol. 2 



Section III. Monantheae 



Section IV. Cyathiferae 

 T. microceplialiim Pursh 16 



Section V. Vesiculeae 



T. fucatum Lindl 16 



T. fucatum var. virescens (T. virescens Greene) 16 



Section VI. Bracteolateae 



Section VII. Macreae 



T. albo'purpureum T. and G 16 



T. diehotomum H. and A 32 



Section VIII. Longifoleae 

 T. rcflexum L 16 



Section IX. Ciliatae 

 T. ciliolatum Bentli. {T. ciliatum Nutt.) 16 



The other species counted are : 



2n 



T. pratense 14 



T. incarnatum 14 



T. repens, 2 varieties..- 32 



T. hyhridum 16 



T. glomeratum 16 



T. minus(l)* 32 



T. suiterranum 16 



T. alexandrinum 16 



* The identification of this species is not certain, as it was not observed in 

 flower. T. minus ought to be studied anew to ascertain wliether it has 28 

 chromosomes as found by Bleier or 32 as found by me. If 28 is correct, this 

 represents the only double species of the 7 series. 



The eighteen species counted b}- the writer form the following 

 •series of diploid chromosome numbers : 



Diploid number of chromosomes 14 16 32 48 



Number of species 2 12 3 1 



In Trifolium incarnatum, Karpechenko found 14 somatic chromo- 

 somes and Bleier has plates with both 7 and 8 bivalents at heterotypic 

 metaphase. I found the somatic number to be 14, which is probably 

 correct for this species. In T. repens, Karpechenko found 32 diploid 

 chromosomes and Bleier found 14 bivalents at first metaphase. Erith 

 (1924) counted the chromosome numbers in three varieties of T. 

 repens. On page 113, Erith states, "the two cultivated races of Avhite 

 clover have the same number of chromosomes as the small wild 



