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

Just Accepted

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Species limits and taxonomic revision of the bracteate-prostrate group of Southern Hemisphere forget-me-nots (Myosotis, Boraginaceae) including description of three new species endemic to New Zealand

Heidi Meudt , Jessica Prebble

Abstract

A taxonomic revision of Southern Hemisphere bracteate-prostrate forget-me-nots (Myosotis, Boraginaceae) is presented here. The group comprises mostly species endemic to New Zealand plus the South American M. antarctica (also Campbell Island) and M. albiflora. The statistical analyses of morphological data from herbarium specimens reported here support recognition of five main subgroups based on habit. Excluding the M. pygmaea species group (M. antarctica, M. brevis, M. drucei, M. glauca, and M. pygmaea), which is being treated elsewhere, fourteen species are recognised in the four remaining subgroups: 1) creeping species group: M. matthewsii, M. chaffeyorum, M. spatulata, M. tenericaulis, and M. albiflora; 2) cushion species group: M. uniflora, M. pulvinaris, and M. glabrescens; 3) M. cheesemanii+M. colensoi species group: M. cheesemanii and M. colensoi; and 4) M. lyallii species group: M. lyalli and new species M. retrorsa Meudt, Prebble & Hindmarsh-Walls. New species Myosotis umbrosa Meudt, Prebble & Thorsen and M. bryonoma Meudt, Prebble & Thorsen do not fit comfortably within these subgroups. Myosotis elderi is treated as M. lyallii subsp. elderi (L.B.Moore) Meudt & Prebble. For each of the fourteen species revised here, a key to species, descriptions, phenology, distributions, maps, illustrations, specimens examined and notes are provided. Some specimens examined do not fit within these species and require additional comparative studies, including with certain ebracteate-erect species, before taxonomic decisions can be made. Future research on these and other Southern Hemisphere Myosotis should incorporate the morphological data presented here with additional genetic, cytological, pollen, and other data in an integrative systematic framework.

SB17045  Accepted 23 November 2017

© CSIRO 2017