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Cladistic Relationships of Kalmia, Leiophyllum, and Loiseleuria (Phyllodoceae, Ericaceae) Based on rbcL and nrITS Data

Kathleen A. Kron and Jennifer M. King
Systematic Botany
Vol. 21, No. 1 (Jan. - Mar., 1996), pp. 17-29
DOI: 10.2307/2419560
Stable URL: http://www.jstor.org/stable/2419560
Page Count: 13
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Cladistic Relationships of Kalmia, Leiophyllum, and Loiseleuria (Phyllodoceae, Ericaceae) Based on rbcL and nrITS Data
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Abstract

The genus Kalmia is restricted to North America and Cuba and has been traditionally associated with the genera Rhodothamnus and Phyllodoce. The monophyly (or naturalness) of Kalmia has heretofore not been questioned because it possesses distinctive corolla pouches. However, cladistic analyses of nucleotide sequences from the chloroplast encoded rbcL gene and the nuclear ribosomal internal transcribed spacers + 5.8s region indicate that some Kalmia species are more closely related to Loiseleuria and Leiophyllum than to other kalmias. Kalmia, as presently recognized, is paraphyletic and the lack of corolla pouches in Leiophyllum buxifolium and Loiseleuria procumbens is most parsimoniously inferred as a loss. Inclusion of Leiophyllum and Loiseleuria (each with only one recognized species) within Kalmia makes the latter monophyletic.

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