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Summary: Evolution of Insular Pacific Pittosporum (Pittosporaceae):
Origin of the Hawaiian Radiation
C. E. C. Gemmill,*,1,3
G. J. Allan,*,2,3
W. L. Wagner, and E. A. Zimmer*
*Laboratory of Molecular Systematics, National Museum of Natural History, Smithsonian Institution, Museum Support Center,
MRC 534, 4210 Silver Hill Road, Suitland, Maryland 20746; and Department of Botany, MRC 166, National Museum
of Natural History, Smithsonian Institution, Washington, DC 20560-0166
Received November 7, 2000; revised May 10, 2001
We investigated the origin of Hawaiian Pittospo-
rum and their relationship to other South Pacific
Pittosporum species using internal transcribed
spacer sequences of nuclear ribosomal DNA. We per-
formed both maximum-parsimony and maximum-
likelihood analyses, which produced congruent re-
sults. Sequence divergence was 0.0% between
Hawaiian members of Pittosporum. These taxa
formed a strongly supported clade, suggesting a sin-
gle colonization event followed by phyletic radia-
tion. Sister to the Hawaiian clade were two South
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