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Introduction
David Havell currently works at in the Northern Threats Unit, Biodiversity Group, New Zealand Department of Conservation. David does work in ecology, botany, and pest plants. A current project is 'The Vegetation, Flora and Mycobiota of the Kermadec Islands', especially exotic and heritage flora .
Publications
Publications (71)
Growth habit, vegetative, floral characters, and molecular data support the recognition of Ranunculus haastii and R. piliferus at species rank, rather than as intraspecific taxa at the rank of subspecies. Therefore, R. piliferus is a new combination at species rank for plants previously known as R. haastii subsp. piliferus. R. acraeus is a new spec...
Where plant species radiations are characterized by hybridization, introgression and polyploidy, complex patterns of phylogenetic relationships are expected, and bifurcating tree methods are often inadequate. In this situation, network methods may have some potential for displaying patterns of phylogenetic incongruence, and in so doing facilitate i...
Although most often used to represent phylogenetic uncertainty, network methods are also potentially useful for describing the phylogenetic complexity expected to characterize recent species radiations. One network method with particular advantages in this context is split decomposition. However, in its standard implementation this approach is limi...
Nothofagus (southern beech), with an 80-million-year-old fossil record, has become iconic as a plant genus whose ancient Gondwanan relationships reach back into the Cretaceous era. Closely associated with Wegener's theory of "Kontinentaldrift", Nothofagus has been regarded as the "key genus in plant biogeography". This paradigm has the New Zealand...
The "Alpine Ranunculi of New Zealand" are a monophyletic group of species distributed between the New Zealand alps, Australian alps, and the subantarctic Campbell and Auckland Islands. For this group we determined and analyzed sequences for the nuclear ITS and chloroplast JSA regions. This latter region was identified from an amplified fragment len...
