Olearia allomii
Common names
Great Barrier tree daisy
Biostatus
Native
Category
Vascular
Structural class
Trees & Shrubs - Dicotyledons
Simplified description
Shrub bearing broad dished leathery leaves that are white underneath and with large clusters of white flowers inhabiting Great Barrier Island. Twigs fuzzy white. Leaves 2.5-5cm long by 2-4cm wide, on a thick white stalk.
Flower colours
White
Distribution
Endemic. Known only from Great Barrier Island.
Habitat
Virtually confined to open shrubland, cliff, and rock outcrops and associated boulderfield. Only abundant on rhyolitic, dacitic rocks and their associated skeletal soils. In some locations it has extended off these onto andesitic soils and rocks but those populations seem to result from past forest disturbance and are not thriving
Current conservation status
The conservation status of all known New Zealand vascular plant taxa at the rank of species and below were reassessed in 2022-2023 using the New Zealand Threat Classification System (NZTCS) – more information about this can be found on the NZTCS website. This report includes replaces all previous NZTCS lists for vascular plants. Previous assessments can be found here.
Please note, threat classifications are often suggested by authors when publications fall between NZTCS assessment periods – these interim threat classification statuses has not been assessed by the NZTCS panel.
- Conservation status of vascular plants in Aotearoa New Zealand, 2023. 2024. Peter J. de Lange, Jane Gosden, Shannel P. Courtney, Alexander J. Fergus, John W. Barkla, Sarah M. Beadel, Paul D. Champion, Rowan Hindmarsh-Walls, Troy Makan and Pascale Michel Department of Conservation. Source: NZTCS and licensed by DOC for reuse under the Creative Commons Attribution 4.0 International licence.
2023 | At Risk – Naturally Uncommon | Qualifiers: DPS, DPT, IE, RR
Threats
Not threatened but a very uncommon endemic, confined largely to the rhyolitic and dacitic rocks of the central portion of Great Barrier Island
Detailed taxonomy
Family
Asteraceae
Synonyms
None
Endemic taxon
Yes
Endemic genus
No
Endemic family
No
Ecology
Flowering
(September-) October (-December)
Fruiting
(October-) December (-April)
Propagation technique
Easy from fresh seed and cuttings but rather hard to maintain in cultivation. Seems to do best in free draining sandy, infertile soils. Good in a pot. Dislikes over watering, humidity and needs full sun.
Other information
Etymology
olearia: Named after Johann Gottfried Olearius, a 17th-century German scholar, writer of hymns and author of Specimen Florae Hallensis
NVS code
The National Vegetation Survey (NVS) Databank is a physical archive and electronic databank containing records of over 94,000 vegetation survey plots - including data from over 19,000 permanent plots. NVS maintains a standard set of species code abbreviations that correspond to standard scientific plant names from the Ngä Tipu o Aotearoa - New Zealand Plants database.
OLEALL
Chromosome number
2n = 108
Previous conservation statuses
2017 | At Risk – Naturally Uncommon | Qualifiers: DP, IE, RR
2012 | At Risk – Naturally Uncommon | Qualifiers: IE, RR
2009 | At Risk – Naturally Uncommon | Qualifiers: OL, IE
2004 | Range Restricted