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A paedomorphocline in Eucalyptus: natural variation in the E. risdonii / E. tenuiramis complex


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Wiltshire, RJE, Potts, BM and Reid, JB 1991 , 'A paedomorphocline in Eucalyptus: natural variation in the E. risdonii / E. tenuiramis complex' , Australian Journal of Botany, vol. 39, no. 6 , pp. 545-566 , doi: 10.1071/BT9910545.

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Ontogenetic and morphological variation in 40 natural populations of the closely related species, E.
risdonii and E. tenuiramis, were assessed in a multivariate study of juvenile and adult leaf and fruit
characters. The present taxonomic separation of the two taxa is based mainly on ontogenetic differences,
but this study reveals that the variation between the two taxa in the retention of the juvenile leaf
habit is continuous and may represent a paedomorphocline. The morphological data suggest that at
least four phenetic groups are required to summarise the morphological variation in the E. risdoniil
E. tenuiramis complex. When ontogenetic variation is removed, the morphological variation between
some E. risdonii and some E. tenuiramis populations is also continuous and much smaller than the
morphological differences within E. tenuiramis. This suggests that E. risdonii may be the product of
relatively recent changes in developmental timing (heterochrony) from E. tenuiramis.

Item Type: Article
Authors/Creators:Wiltshire, RJE and Potts, BM and Reid, JB
Journal or Publication Title: Australian Journal of Botany
ISSN: 0067-1924
DOI / ID Number: 10.1071/BT9910545
Additional Information:

BM Potts. Copyright © 1991 CSIRO

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