1965 年 30 巻 2 号 p. 201-204
Interspecific hybrids were obtained between H. depressum (4X) and the allotetraploids (H. pusillum No. 53×H. compressum), (H. marinum No. 56-39×H. pusillum×H. pusillum No. 53) and (H. marinum No. 56-39×H. compressum). These hybrids were all self-sterile. Interspecific hybrids between H. depressum and allotetraploid (H. pusillum No. 53×H. compressum) produced seed through backcrossing to the male parent.
Cytological examinations indicated that at least some of the chromosomes of H. depressum pair with the chromosomes of H. pusillum.