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A Morphometric Analysis and Taxonomic Appraisal of the Hawaiian Silversword Argyroxiphium sandwicense DC. (Asteraceae)

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Title:A Morphometric Analysis and Taxonomic Appraisal of the Hawaiian Silversword Argyroxiphium sandwicense DC. (Asteraceae)
Authors:Meyrat, Alain
Carr, Gerald D.
Smith, Clifford W.
Date Issued:Jul 1983
Publisher:University of Hawai'i Press
Citation:Meyrat A, Carr GD, Smith CW. 1983. A Morphometric analysis and taxonomic appraisal of the Hawaiian silversword Argyroxiphium sandwicense DC. (Asteraceae). Pac Sci 37(3): 211-225.
Abstract:Morphometric techniques were used to examine the pattern of
variation of45 characters between the Haleakala and Mauna Kea populations of
Argyro xiphium sandwicense. Qualitative features were also evaluated. A framework
for a priori comparisons between the two populations of A. sandwicense
was provided by including two additional species in the study, that is, A . kauense
and .A. virescens var. paludosa. The F tests of one-way analysis of variance
indicate that the means of each of 18 characters differ significantly (P ~ 0.05)
between the two populations of A. sandwicense. Based on the presence of quantitative
differentiation and geographical isolation and the near absence of qualitative
differentiation between the two populations, it is proposed to recognize
them as two different subspecies: A. sandwicense ssp. macrocephalum (Haleakala)
and A. sandwicense ssp. sandwicense (Mauna Kea). The stud y also indicates that
A . virescens var. paludosa, A . kauense, and A . sandwicense are distinct from one
another in several quantitative and qualitative characters. Taxonomically useful
quantitative characters include inflorescence proportions, leaf proportions,
number of ray florets per capitulum, and capitulum diameter. The subspecies of
A . sandwicense can be recognized on the basis of inflorescence proportions.
However, to separate all four taxa, based on quantitative characters, a combination
of at least three of the foregoing features appear to be needed . A taxonomic
key and descriptions for common taxa ofArgyro xiphium of the island of Hawai'i
and of East Maui are presented.
Appears in Collections: Pacific Science Volume 37, Number 3, 1983
Smith, Clifford W.
Carr, Gerald D.

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