Australian Systematic Botany Australian Systematic Botany Society
Taxonomy, biogeography and evolution of plants

Just Accepted

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Waking Sleeping Beauties – A Molecular Phylogeny and Nomenclator of Halgania (Ehretiaceae, Boraginales)

Norbert Holstein , Marc Gottschling

Abstract

Halgania (Ehretiaceae, Boraginales) comprises about 20 species of ericoid shrubs endemic to Australia. Knowledge about taxonomy and morphology is notably scarce in Halgania. We describe the morphological diversity and infer relationships using molecular phylogenetics. The five petals in all Halgania species are blue through violet (rarely white). The yellow through purple anthers are connected to a cone surrounding the single style. Differences between the species are mainly found in the indumentum of the plants, the leaf margin (i.e., degree of serration), the sepals (being either of equal or of unequal size) and the length of the beak-like anther appendages. A phylogenetic tree mainly based on ITS sequences retrieves three highly supported groups. The H. andromedifolia clade uniquely has sepals of unequal size, and the H. anagalloides clade exhibits dolabriform trichomes. The remaining taxa (constituting the H. littoralis clade) lack such diagnostic traits and are reliably retrieved as sister group of the H. anagalloides clade. As a first step toward the taxonomic revision of Halgania, we have compiled a nomenclatural list of all validly published names (at the species level and below), provide information about herbarium deposition of original material and discuss current use of the names.

SB17017  Accepted 13 December 2017

© CSIRO 2017