94 



Gates, Tetraploid Mutants and Chromosome Mechanisms. 



Table I. contd. 



species he found 8 gemini, and remarks that if the Aphanes group of the genus 

 Alchemilla have been derived from such ancestors, they should be regarded as 

 tetraploid and the Eualchemillas as octoploid in character. He suggests that a 

 similar explanation may apply to the Elatostemas and Urticas. 



3) Strasburger points out (1910, p. 429) that in this case the chromosomes 

 of the tetraploid species are half the size of those in the diploid species, while the 

 nuclei are the same size in both, from which he concludes that in this case the 

 tetraploid number originated through a transverse division of the chromosomes. 



4) Nuclear size same as in previous species. 



5) Nuclei larger than in the section Acetosa. Also the species with low 

 chromosome numbers do not hybridize, while species with high numbers cross readily. 



6) This number is tetraploid as compared with many other Liliaceae, and 

 probably originated through a transverse division of the chromosomes. 



7)' See Strasburger (1910, p. 442). 



