Species

Metrosideros albiflora

Etymology

Metrosideros: iron heart
albiflora: white flowered

Common Name(s)

white rata, akatea

Current Conservation Status

2012 - Not Threatened

Conservation status of New Zealand indigenous vascular plants, 2012
The conservation status of all known New Zealand vascular plant taxa at the rank of species and below were reassessed in 2012 using the New Zealand Threat Classification System (NZTCS). This report includes a statistical summary and brief notes on changes since 2009 and replaces all previous NZTCS lists for vascular plants. Authors: Peter J. de Lange, Jeremy R. Rolfe, Paul D. Champion, Shannel P. Courtney, Peter B. Heenan, John W. Barkla, Ewen K. Cameron, David A. Norton and Rodney A. Hitchmough. File size: 792KB

Previous Conservation Status

2009 - Not Threatened
2004 - Not Threatened

Authority

Metrosideros albiflora Sol. ex Gaertn.

Family

Myrtaceae

Brief Description

Woody long-climbing vine. Mature plants only reproductive. Adult leaves green, without hairs, elliptic in shape, surfaces without any obvious glandular spotting. Flowers white, fluffy, in dense terminal clusters.

Flora Category

Vascular - Native

NVS Species Code

METALB

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.

Structural Class

Dicotyledonous Lianes and Related Trailing Plants

Distribution

Endemic. New Zealand: North Island (confined to the northern portion of the North Island where it ranges from Te Paki south to Pukemokemoke (north of Hamilton) and the northern Kaimai Ranges)

Habitat

Coastal to montane in forest. Metrosideros albiflora is virtually confined to kauri (Agathis australis) forest associations

Features

Stout vine up to 20 m. Bark initially dark brown, maturing grey, ± tessellated, and flaking in tabular shards. Juvenile and climbing vines sparingly branched, mature (adult) vines much-branched. Branchlets terete, often curved from base, stiffly erect (sometimes pendent), initially reddish and finely pubescent, soon glabrous. Leaves not markedly dimorphic, evenly spaced (i.e. not close-set), coriaceous, glabrous, petiolate; petioles 2-6 mm long, ± terete, stout; juvenile lamina 10-20 × 10-20 mm, ovate to elliptic-ovate, adaxially green to dark green, paler abaxially, oil glands minute (not evident to naked eye), margins weakly recurved, sparsely hairy, glabrescent; adult lamina 35-90 × 20-46 mm, ovate, elliptic-ovate to elliptic-lanceolate, apex abruptly narrowed, acute or subacute, base cuneate, adaxially green to dark green, abaxially paler, oil glands as for juvenile. Inflorescences in large terminal, compound cymose botyria, each carrying 6-10 white flowers. Hypanthium 8 × 5 mm, broadly urceolate to funnelform, ± fleshy, glabrous, margins exceeding ovary (so forming broad disc); calyx lobes 1.8-2.2 mm long, ovate, obtuse, patent or reflexed at maturity. Petals 5 × 5 mm, caducous, suborbicular to orbicular, margins entire; stamens numerous, 15-30 mm long. Anthers yellow. Style 20-35 mm long, stigma capitate. Capsule 5-10 mm diameter, urceolate, 3-4-valved, woody, dark brown to brown-black when mature. Seeds 1.2-2.4 mm long, narrowly elliptic or narrowly obovate, straight (often curved near apex), light orange-yellow or orange, unfilled seeds darker.

Similar Taxa

Metrosideros albiflora, despite the unfortunate vernacular "white rata" is not very similar to the other "white rata" M. perforata, which has much smaller, glandular punctate leaves, and smaller more numerous clusters of white flowers. The glabrous stems, tinged red when young, large, glabrous, elliptic-ovate to elliptic-lanceolate (rarely ovate), acute to subacute, green adult leaves, much larger, white flowers, and late winter to spring flowering habit serve to distinguish it from all other similar Metrosideros vines

Flowering

August - November

Flower Colours

White

Fruiting

January - April

Propagation Technique

Although a beautiful species, M. albiflora is not commonly cultivated and it has a reputation for being difficult. Like all other climbing rata it can be grown from rooted pieces and from semi-hardwood cuttings. However like all Metrosideros cuttings can be fickle to strike. This species is cold sensitive.

Threats

Although not threatened, Metrosideros albiflora is often absent from large parts of potential range. It is most common in central and western Northland and the Coromandel Peninsula. Adult vines are often browsed by possums.

Chromosome No.

2n = 22

Endemic Taxon

Yes

Endemic Genus

No

Endemic Family

No

Where To Buy

Occasionally sold by specialist native plant nurseries

   

Attribution

Fact sheet prepared for NZPCN by P.J. de Lange (6 January 2013). Description from herbarium specimens and fresh material

This page last updated on 25 Oct 2016