A Computer Program for Classifying Plants II. A Numerical Handling of Non-Numerical Data

Rogers, David J.; Fleming, Henry S.

doi:10.2307/1293281

Cited by 17 publications

(19 citation statements)

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“…For example, with five characters and two OTUs, and with agreement between the two OTUs for three of the characters, by using one NT method the ratio of similarity between the two OTUs would be Y5 or 0.60. Many more than five characters are used and other estimates of phenetic similarity are available (see Sokal and Sneath, 1963;Rogers and Fleming, 1964), but the basic method for obtaining quantified estimates of phenetic affinity is the same.…”

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confidence: 99%

“…2) distance values. Rogers and Fleming's (1964) negative logarithmic transformation of the matching coefficient (D = -log2 Srt, where Srt = sum of the matches in character-states divided by the sum of the number of comparisons) was used to estimate phenetic distances. An IBM 7040 electronic computer was employed for the computations with a program written in Fortran IV.…”

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confidence: 99%

“…Table 2 presents circumscriptions in terms of phenetic distance, standard deviation doubled, and the coefficients of variation as sampled among some members of several individual taxa: three subgenera of Tillandsia (Allardtia, Pseudo-Catopsi& and Tillandsia) and the genera Vriesea, Guzmania and Tillandsia. (Rogers and Fleming, 1964). b The phenetic distances were computed between OTUs (plants) anid were selected from those among OTUs at each of the taxonomic levels as follows.…”

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confidence: 99%

“…Another example is provided by collections of Tillandsia insularis MVIez, made from two aggregations of this species in the Galapagos Islands: one from Bella Vista on the southern slopes and the other (some 10 km distant) from El Occidente on the western slopes of the island of Santa Cruz. The intra-and interpopulation differences ( (Rogers and Fleming, 1964).…”

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The Quantification of Some Plant-Taxa Circumscriptions

Gilmartin

1969

American Journal of Botany

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The Quantification of Some Plant-Taxa Circumscriptions

Gilmartin

1969

American Journal of Botany

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“…The estimates of phenetic affinity were computed with up to 104 characters each having from 3 to 6 different states. Rogers and Fleming's (1964) negative logarithmic transformation of the similarity ratio was used to estimate phenetic affinities.…”

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confidence: 99%

Numerical Phenetic Samples of Taxonomic Circumscriptions in the Bromeliaceae

Gilmartin

1969

TAXON

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Summary A new approach for sampling taxonomic circumscriptions by estimating intrataxon variability yielded some noteworthy data. The data are presented for the phenetic distances computed between plant specimens which had been determined in the classical taxonomic manner. The paper complements one to appear in the American Journal of Botany in which summary statistics support the hypothesis that the phenetic distances (phenetic affinities) and their variances can quantify taxonomic circumscriptions by providing estimates of the similarity between various members of the same taxa. The names of the taxa are listed and the phenetic distances between specimens of a large number of taxa at various levels in the family and the respective variances are presented in nine tables.

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The Quantification of Some Plant‐taxa Circumscriptions

Gilmartin

1969

American J of Botany

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Intrataxon variability is estimated by the technique of numerical taxonomy. Taxa which had been determined by orthodox taxonomic methods are subjected to analyses by numerical phenetics. Comparisons are made of the amounts of cohesion among the members of different taxa in the Bromeliaceae at several taxonomic levels by computing the degrees of similarities between members of the same taxon and of different taxa. Results of these comparisons with several taxa reveal that the variability of a taxon in terms of phenetic distance computed with a large number of characters does not necessarily agree with a subjective appraisal of variability. The method facilitated difficult taxonomic determinations and provided an estimate of the relative evolutionary ages of different taxonomic groups.

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A Computer Program for Classifying Plants II. A Numerical Handling of Non-Numerical Data

Cited by 17 publications

References 4 publications

The Quantification of Some Plant-Taxa Circumscriptions

The Quantification of Some Plant-Taxa Circumscriptions

Numerical Phenetic Samples of Taxonomic Circumscriptions in the Bromeliaceae

The Quantification of Some Plant‐taxa Circumscriptions

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