Metrosideros parkinsonii

Species

Metrosideros parkinsonii

Etymology

Metrosideros: iron heart

Common Name(s)

Parkinson's rata

Current Threat Status

2018 - Threatened - Nationally Vulnerable

Previous Threat Status

2012 - Not Threatened
2009 - Not Threatened
2004 - Not Threatened

Authority

Metrosideros parkinsonii Buchanan

Family

Myrtaceae

Brief Description

Much branched shrub or small tree. Trunks 1 or more. Branches erect. Leaves almost clasping stems, dark green to yellow green above, paler beneath, thick, leathery, pointed, surfaces often blistered and blemished red. Flowers crimson, fluffy produced directly from branches, and often hidden by vegetative growth.

Flora Category

Vascular - Native

Distribution

Endemic. New Zealand: North and South Islands. In the North Island known only from Hauturu (Little Barrier Island) and Aotea Island (Great Barrier Island). In the South Island confined to the western side where it is locally common from Mt Burnett (near Collingwood) south to just north of Hokitika.

Habitat

Coastal to montane forest. usually along ridgelines in peaty ground. In the North Island confined to montane "cloud" forest, usually in wind-pruned forest, scrubland and on the margins of cliff faces or surmounting rock outcrops

Features

Shrub to small spindly tree up to 10 m tall. Multi-trunked, trunks up to 60 mm d.b.h.. Bark pale grey, flaking in small tabular shards. Branches few to many, erect, Branchlets square in cross-section, 4-angled, glabrous, initially dark red, maturing brown-grey to grey. Emergent vegetative buds pink or red-tinged. Leaves coriaceous, glabrous, adaxially dark green to green, abaxially paler, oil glands minute, scarcely evident to naked eye (except abaxially) petiolate; petioles almost wanting 2.2-3.0 mm. long; lamina 25-75 × 15-30 mm, ovate-lanceolate, base truncate to subamplexicaul, apex usually abruptly narrowed, to an obtuse or subacute tip. Inflorescences cauliflorus, borne in compound, sometimes leafy cymose botyria, mostly below main vegetative branches. Flowers up to 8 per cyme, crimson. Hypanthium turbinate, margins exceeding disc, calyx lobes ovate-triangular. Ovary triloculiar. Capsules 3-valved, 6-8 mm long, brown-grey to grey, subglobose to globose.Petals caducous, 5 × 5 mm, suborbicular to oblong, margins finely denticulate or subentire; stamens numerous, filaments 20-28 mm long, anthers yellow, style 23-30 mm long, stigma capitate. Seeds 1.2-2.0 mm long, narrowly obtriangular, narrowly elliptic to narrowly obovate, straight, rarely curved toward apices, orange, unfilled seeds similar but darker in colour.

Similar Taxa

Easily recognised by the shrub of small-tree, multi-trunked growth habit, often with spindly branches, shortly petiolate, ovate-lanceolate leaves, cauliforous flowering habit, and crimson flowers.

Flowering

September - December

Main Flower Colour

Red / Pink

Other Flower Colour

Black

Fruiting

January - April

Propagation Technique

Although a beautiful species, M. parkinsonii is difficult to maintain in cultivation, with even well established plants suddenly dying. While it can be grown from semi-hardwood cuttings these are difficult to strike. This species seems to do best planted in a damp, humus-enriched soil in a semi-shaded site.

Threats

Not Threatened. However, outside its north western South Island haunts it is only known from two small populations on Aotea Island (Great Barrier Island) and Hauturu (Little Barrier Island) where it is very uncommon. On Aotea some trees have been damaged by tracking up Mt Hirakimata (Mt Hobson). In the South Island, like all rata species, M. parkinsonii is impacted upon by possums.

Chromosome No.

2n = 22

Endemic Taxon

Yes

Endemic Genus

No

Endemic Family

No

Where To Buy

Occasionally offered by specialist native plant nurseries.

This page last updated on 6 Dec 2014

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