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

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Wiltshire, RJE and Potts, BM and Reid, JB (1991) A paedomorphocline in Eucalyptus: natural variation in the E. risdonii / E. tenuiramis complex. Australian Journal of Botany, 39 (6). pp. 545-566. ISSN 0067-1924

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Abstract

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
Journal or Publication Title: Australian Journal of Botany
Page Range: pp. 545-566
ISSN: 0067-1924
Identification Number - DOI: 10.1071/BT9910545
Additional Information: BM Potts. Copyright © 1991 CSIRO
Date Deposited: 12 Sep 2008 00:10
Last Modified: 18 Nov 2014 03:48
URI: http://eprints.utas.edu.au/id/eprint/7337
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