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A contribution to a cytogenetical survey of the Malvaceae

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Summary

  1. 1.

    Chromosome numbers of 32 species from 13 genera representing three of the four tribes of the Malvaceae are reported. They are summarized in Table 1 (p. 433).

  2. 2.

    It is possible to identify certain of the chromosomes of the diploid species ofAbutilon by characteristic features of their morphology.

  3. 3.

    Attachment of chromosomes to the nucleolus in the prophase of mitosis or meiosis has been observed in several genera, especiallyAbutilon andSidalcea.

  4. 4.

    Secondary association probably occurs in most polyploid species examined, but is not pronounced.

  5. 5.

    Tetraploid strains occur in severalHibiscus species.

  6. 6.

    Of three races ofAnoda cristata L., two had the haploid number 15, while the third had n=18. The problem of the origin of such variant strains is discussed.

  7. 7.

    It is concluded that 7 is the basic number in theMalveae andUreneae, and probably also in theMalopeae. The basic number in theHibisceae is as yet uncertain, though the evidence is not incompatible with b=7 as in the Malveae and Ureneae.

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Authors and Affiliations

  1. Botany Department, University of London, King's College, London, UK

    C. E. Ford

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  1. C. E. Ford
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Ford, C.E. A contribution to a cytogenetical survey of the Malvaceae. Genetica 20, 431–452 (1938). https://doi.org/10.1007/BF01531777

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