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Australian Journal of Botany Australian Journal of Botany Society
Southern hemisphere botanical ecosystems
RESEARCH ARTICLE

Relationships in the Stringybarks, Eucalyptus L'hérit. Informal Subgenus Monocalyptus Series Capitellatae and Olsenianae: Phylogenetic Hypotheses, Biogeography and Classification

PY Ladiges and CJ Humphries

Australian Journal of Botany 34(6) 603 - 632
Published: 1986

Abstract

The stringybark eucalypts form a monophyletic group characterised in Monocalyptus by hispid juvenile leaves. They have been analysed using a phenetic method, additive similarity trees and a cladistic parsimony method (Wagner trees).

The shortest Wagner trees indicated that Eucalyptus muelleriana is the sister species to all other stringybarks. E. olsenii and a taxon from the Carnarvon Range (Queensland) are the next most plesiomorphic taxa in the phyletic sequence. The remaining taxa form a trichotomy: E. tindaliae, species with fruits > 8 mm in diameter and with the disc ascending, and species with fruits < 8 mm and with the disc level. Subclades are largely characterised by seedling morphology. A revised informal classification is presented, the group being treated as a superseries.

A method of cladistic biogeography is explained and applied. The stringybarks are endemic to eastern mainland Australia plus Kangaroo Island, but not Tasmania, and the consensus area-cladogram suggests a sequence of seven historical events subdividing an ancestral area into eight smaller ones. Queensland appears to be the most plesiomorphic area.

https://doi.org/10.1071/BT9860603

© CSIRO 1986

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