The Chromosome Numbers of North American Coreopsis with Phyletic Interpretations

Smith, Edwin B.

doi:10.1086/336785

Cited by 60 publications

(76 citation statements)

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“…The general conclusions are valid in comparison to any of the modern systems of classification, and one of the major conclusions, acceptance of higher base numbers for most of the subtribes of the Heliantheae, was anticipated by Smith (1975) on the basis of traditional subtribal concepts.…”

mentioning

confidence: 61%

“…Numbers above X= 10 often form patterns easily interpreted as decreasing aneuploid series. The pattern usually is confirmed when actual relationships of species are known, and such decreasing patterns in the Coreopsidinae led Smith (1975) to postulate a higher base number for the subtribe and tribe. The subtribes with high base numbers predominate throughout the paleaceous and epaleaceous groups of the Heliantheae, with only the isolated Marsallinae unquestionably excluded.…”

Section: Chromosome History Of the Tribementioning

confidence: 81%

“…In a study of the chromosome numbers of Coreopsis, which has implications for the whole tribe, Smith (1975) Stuessy (1977) and runs counter to all previous suggestions of simple derivations of higher numbers in the tribe from lower base numbers.…”

Section: Chromosome History Of the Tribementioning

confidence: 88%

“…Even with a general acceptance of the higher base number of X=17-19 suggested by Smith (1975) for the Heliantheae, there is still the question of the ultimate base number from which the higher number is derived. In a previous paper of this series (Solbrig et al, 1972), a base of X=8-12 was suggested for the Heliantheae, and in the review of the tribe by Stuessy (1977) an original X=8 or 9 was suggested.…”

Section: Ultimate Base Number Of the Tribementioning

confidence: 99%

“…The most common chromosome number in the subtribe is n=12, and Stuessy seems to regard this as the base number. In a study of the chromosome numbers of Coreopsis, which has implications for the whole tribe, Smith (1975) (Turner, 1978), forming some of the most divergent elements in the subtribe.…”

Section: An Anomaly Inmentioning

confidence: 99%

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Chromosome numbers in Compositae, XII, Heliantheae /

Robinson¹

1981

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mentioning

confidence: 61%

Section: Chromosome History Of the Tribementioning

confidence: 81%

Section: Chromosome History Of the Tribementioning

confidence: 88%

Section: Ultimate Base Number Of the Tribementioning

confidence: 99%

Section: An Anomaly Inmentioning

confidence: 99%

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Chromosome numbers in Compositae, XII, Heliantheae /

Robinson¹

1981

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The Distribution of Anthochlor Floral Pigments in North American Coreopsis (Compositae): Taxonomic and Phyletic Interpretations

Crawford

Smith

1983

American J of Botany

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Anthochlors (chalcones and aurones) occur in floral tissues of all members of North American Coreopsis. The genus in North America consists of 46 species distributed in 11 sections, and a total of five chalcone aglycones are found in it. The chalcone butein occurs in all sections, and is the only anthochlor constituent in the closely related woody Mexican sections Electra and Anathysana. These two sections are viewed as primitive. The morphologically distinct but putatively unspecialized woody Mexican section Pseudo‐Agarista sequesters both okanin and butein; the same two anthochlors also characterize two additional sections of herbaceous perennials, Silphidium and Tuckermannia. Sections Euleptosyne and Pugiopappus, comprised of annuals restricted primarily to California, exhibit the rare chalcone stillopsidin in addition to butein and okanin. The remaining four sections, Palmatae, Coreopsis, Calliopsis and Eublepharis are among the more specialized in North America, and are sometimes considered to represent a distinct phyletic line or two related lines. All or some of the members of these sections sequester the very rare chalcone lanceolatin in floral tissues in addition to okanin. Butein is also present in some or all species in each section, and isoliquiritigenin occurs rarely in two sections. Those sections considered more specialized have additional anthochlors relative to primitive sections, and any compound found in a more primitive section also occurs in a more advanced one. Thus, the trend in floral anthochlors in North American Coreopsis is toward increased number of compounds rather than reduction.

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Phyletic Trends in Sections Eublepharis and Calliopsis of the Genus Coreopsis (Compositae)

Smith

1983

American J of Botany

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Artificial hybridization, fertility of interspecific and intersectional hybrids, chromosome numbers, and trends in habit and morphology in taxa of sections Eublepharis and Calliopsis of the genus Coreopsis are used to consider the sectional relationships and to derive a presumed phylogeny for the two sections. The two sections are closely related and show a low level of interfertility, but this level is as high as in some interspecific crosses within sections. The sections differ in base chromosome number and achene winging. The problematic C. rosea evidently should remain in section Eublepharis. Both sections probably arose from x = 13 stock resembling C. integrifolia or C. pubescens. Descending aneuploidy was involved in the derivation of section Calliopsis, while chromosome evolution in section Eublepharis has involved polyploidy.

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The Chromosome Numbers of North American Coreopsis with Phyletic Interpretations

Cited by 60 publications

References 0 publications

Chromosome numbers in Compositae, XII, Heliantheae /

Chromosome numbers in Compositae, XII, Heliantheae /

The Distribution of Anthochlor Floral Pigments in North American Coreopsis (Compositae): Taxonomic and Phyletic Interpretations

Phyletic Trends in Sections Eublepharis and Calliopsis of the Genus Coreopsis (Compositae)

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