| 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).
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| 2. |
It is possible to identify certain of the chromosomes of the diploid species ofAbutilon by characteristic features of their morphology.
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| 3. |
Attachment of chromosomes to the nucleolus in the prophase of mitosis or meiosis has been observed in several genera, especiallyAbutilon andSidalcea.
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| 4. |
Secondary association probably occurs in most polyploid species examined, but is not pronounced.
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| 5. |
Tetraploid strains occur in severalHibiscus species.
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| 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.
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| 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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