Triploid and tetraploid hybrids from diploid x tetraploid crosses in Grindella (compositae).

@article{Dunford1970TriploidAT,
  title={Triploid and tetraploid hybrids from diploid x tetraploid crosses in Grindella (compositae).},
  author={M. Dunford},
  journal={American journal of botany},
  year={1970},
  volume={57 7},
  pages={
          856-60
        }
}
  • M. Dunford
  • Published 1 August 1970
  • Biology, Medicine
  • American journal of botany
Crosses between the diploids G. oxylepis var. eligulata Steyermark (Mexico) and G. havardii Steyermark (New Mexico) and the tetraploid G. aphanactis Rydb. (New Mexico) were made. With G. aphanactis as the pistillate parent and G. havardii as the pollen parent a triploid hybrid was obtained in which the maximum meiotic configuration observed was 6III. The plant was 10 % fertile. Two triploid hybrid plants were also obtained when G. aphanactis was used as the pistillate parent and G. oxylepis var… 
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References

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A CYTOGENETIC ANALYSIS OF CERTAIN POLYPLOIDS IN GRINDELIA (COMPOSITAE)
TLDR
Close genetic relationships between the diploids and between the tetraploids are indicated, and geographical, ecological, and seasonal barriers to gene exchange exist, and attempts to obtain hybrids between diploid and tetraPloid interspecific hybrids were successful in a few cases.
INTERCHANGE HETEROZYGOSITY IN DIPLOID INTERSPECIFIC HYBRIDS IN GRINDELIA (COMPOSITAE)
TLDR
Hypothetical chromosome end arrangements and names for the respective genomes, based on G. oxylepis as a standard, are presented to corroborate a previously published phylogenetic scheme of the genus based on morphological, ecological, and distributional studies.
Studies in Grindelia. III
TLDR
When the plants flowered and matured fruit during the summer of 1807, Willdenow observed that they differed from Inula, under which Persoon2 had identified them, and from Aster, so he described from them a new genus, Grindelia, in honor of Professor Grindel of Dorpat, and named the particular plant Grindelia inuloides.