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  4. Kunzea triregensis

Kunzea triregensis

In cultivation ex Great Island.<br>Photographer: Jeremy R. Rolfe, Date taken: 23 August 2014, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
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In cultivation ex Great Island, Three Kings. Jul 2007.<br>Photographer: Jeremy R. Rolfe, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
In cultivation ex Great Island, Three Kings. Jul 2007.<br>Photographer: Jeremy R. Rolfe, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
In cultivation ex Great Island, Three Kings. Jul 2007.<br>Photographer: Jeremy R. Rolfe, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
Ripening fruit, in cultivation ex Great Island.<br>Photographer: Jeremy R. Rolfe, Date taken: 23 August 2014, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
Ripening fruit, in cultivation ex Great Island.<br>Photographer: Jeremy R. Rolfe, Date taken: 23 August 2014, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
Members can view this photo in high resolution
In cultivation ex Great Island.<br>Photographer: Jeremy R. Rolfe, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
In cultivation ex Great Island.<br>Photographer: Jeremy R. Rolfe, Date taken: 23 August 2014, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
Members can view this photo in high resolution
In cultivation ex Great Island.<br>Photographer: Jeremy R. Rolfe, Date taken: 23 August 2014, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
In cultivation ex Great Island.<br>Photographer: Jeremy R. Rolfe, Date taken: 23 August 2014, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
In cultivation ex Great Island.<br>Photographer: Jeremy R. Rolfe, Date taken: 23 August 2014, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
Members can view this photo in high resolution
Immature fruit, in cultivation ex Great Island.<br>Photographer: Jeremy R. Rolfe, Date taken: 23 August 2014, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
Immature fruit, in cultivation ex Great Island.<br>Photographer: Jeremy R. Rolfe, Date taken: 23 August 2014, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
Members can view this photo in high resolution
In cultivation ex Great Island.<br>Photographer: Jeremy R. Rolfe, Date taken: 23 August 2014, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
In cultivation ex Great Island.<br>Photographer: Jeremy R. Rolfe, Date taken: 23 August 2014, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
Members can view this photo in high resolution
Longitudunal section of flower, in cultivation ex Great Island.<br>Photographer: Jeremy R. Rolfe, Date taken: 23 August 2014, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
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Stamen; in cultivation ex Great Island.<br>Photographer: Jeremy R. Rolfe, Date taken: 23 August 2014, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
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Leaf induemntum—abaxial surface (left), adaxial surface (right); in cultivation ex Great Island.<br>Photographer: Jeremy R. Rolfe, Date taken: 23 August 2014, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
Leaf induemntum—abaxial surface (left), adaxial surface (right); in cultivation ex Great Island.<br>Photographer: Jeremy R. Rolfe, Date taken: 23 August 2014, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
Members can view this photo in high resolution
Flower bud, note arrangement of calyx; in cultivation ex Great Island.<br>Photographer: Jeremy R. Rolfe, Date taken: 23 August 2014, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
Flower bud, note arrangement of calyx; in cultivation ex Great Island.<br>Photographer: Jeremy R. Rolfe, Date taken: 23 August 2014, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
Members can view this photo in high resolution
Indumentum on young stem and flower buds; in cultivation ex Great Island.<br>Photographer: Jeremy R. Rolfe, Date taken: 23 August 2014, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
Indumentum on young stem and flower buds; in cultivation ex Great Island.<br>Photographer: Jeremy R. Rolfe, Date taken: 23 August 2014, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
Members can view this photo in high resolution
Arrangement of floral parts; in cultivation ex Great Island.<br>Photographer: Jeremy R. Rolfe, Date taken: 23 August 2014, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
Members can view this photo in high resolution
Anthers and stigma (centre); in cultivation ex Great Island.<br>Photographer: Jeremy R. Rolfe, Date taken: 23 August 2014, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
Members can view this photo in high resolution
Developing fruit.<br>Photographer: Jeremy R. Rolfe, Date taken: 4 November 2014, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
Members can view this photo in high resolution
Old fruit.<br>Photographer: Jeremy R. Rolfe, Date taken: 4 November 2014, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
Members can view this photo in high resolution
Old fruit.<br>Photographer: Jeremy R. Rolfe, Date taken: 4 November 2014, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
Members can view this photo in high resolution
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Common name

Three Kings kanuka

Synonyms

None - first described in 2014

Family

Myrtaceae

Authority

Kunzea triregensis de Lange

Flora category

Vascular – Native

Endemic taxon

Yes

Endemic genus

No

Endemic family

No

Structural class

Trees & Shrubs - Dicotyledons

Chromosome number

2n = 22

Current conservation status

  • Conservation status of New Zealand indigenous vascular plants, 2017

The conservation status of all known New Zealand vascular plant taxa at the rank of species and below were reassessed in 2017 using the New Zealand Threat Classification System (NZTCS). This report includes a statistical summary and brief notes on changes since 2012 and replaces all previous NZTCS lists for vascular plants. Authors: By Peter J. de Lange, Jeremy R. Rolfe, John W. Barkla, Shannel P. Courtney, Paul D. Champion, Leon R. Perrie, Sarah M. Beadel, Kerry A. Ford, Ilse Breitwieser, Ines Schönberger, Rowan Hindmarsh-Walls, Peter B. Heenan and Kate Ladley.

2018 | Threatened – Nationally Critical

Previous conservation status

2013 | At Risk – Naturally Uncommon

Distribution

Endemic. Three Kings Islands - North East, Manawatahi / Great Island, South West and West Islands

Habitat

Coastal forest - on Manawatawhi / Great Island forms the dominant tree canopy

Features

Shrubs or trees up to 18 × 3 m. Trunk 1–4, 0.10–0.85 m d.b.h. Bark grey or grey-brown, ± elongate, tessellated, usually bearing a few transverse cracks, firmly attached, detaching basally with age, and peeling upwards along trunk in broad, tabular strips. Branches numerous; upright to somewhat spreading; branchlets numerous, slender; branchlets sericeous, indumentum copious; hairs long appressed, usually flexuose (220–)480(–520) μm long. Leaves sessile; lamina 6.0–13.5 × 1.1–2.3 mm, dark glossy green above, paler beneath with leaf margins and midrib appearing distinctly white because of dense hair growth; lamina lanceolate to narrowly lanceolate; usually strongly recurved for about half of total length; apex acute to narrowly acute, base attenuate; lamina margin completely obscured by dense covering of antrorse-appressed hairs aligned in a thick, up to 0.6 mm wide, almost plumose, white band meeting at leaf apex. Inflorescence an elongated 3–20-flowered botryum up to 200 mm long, basal portion sometimes bearing compact, lateral 3-flowered corymbiform botrya, or with the basal and terminal portions occasionally bearing lateral elongate botyra; distal portions often interrupted by sections of leafy perules between which are spaced further flowers; or interrupted by short floral shoots bearing elongated 3–6-flowered botrya up to 20 mm long; terminal portion often bearing undeveloped flowers and vegetative terminal growth. Inflorescence axis densely invested in antrorse-appressed, weakly flexuose, hairs. Pherophylls persistent, foliose, 6.0–12.8 × 0.9–2.2 mm, dark glossy green, elliptic, broadly lanceolate to lanceolate; apex acute, base attenuate; lamina margin obscured by dense covering of antrorse-appressed, silky hairs. Pedicels subsessile to pedicellate 0.4–3.7 mm long copiously invested in antrorse-appressed, weakly flexuose, silky hairs. Flower buds double-conic to ovoid, calyx lobes prior to bud burst held flat or suberect with lobes ± meeting. Flowers 6.3–12.3 mm diameter. Hypanthium 1.6–4.4 × 2.0–4.6 mm, dark green or red-green; hemispherical to broadly obconic, sometimes campanulate or rarely cupular, densely to sparsely covered in silky, appressed antrorse hairs. Calyx lobes 5, erect, 0.5–1.3 × 0.3–0.8 mm, deltoid to ovate-deltoid, green to red-green; margins pale green often flushed pink, glabrescent. Receptacle green at anthesis, darkening to crimson after fertilisation. Petals 5–6, 1.3–4.3 × 1.9–4.8 mm, white, orbicular to broadly ovate, apex rounded, margins ± finely and irregularly denticulate, oil glands colourless. Stamens 30–53 in 1–3 weakly defined whorls, filaments white. Anthers dorsifixed, 0.05–0.10 × 0.06–0.08 mm, testicular-ellipsoid, latrorse. Pollen white. Anther connective gland prominent, pink or golden-yellow when fresh, drying yellow to pale orange, spheroidal, finely to coarsely papillate. Ovary 4–5 locular, each with 20–38 ovules in two rows on each placental lobe. Style 1.9–3.1 mm long, white or pinkish-white; stigma broadly capitate, wider than style, ± flat, greenish-white or pale pink, flushing red after anthesis, surface granular-papillate. Fruits 1.9–5.2 × 2.0–4.9 mm, dark chestnut-brown, maturing grey, hemispherical, broadly obconic, campanulate to cupular. Seeds 0.50–1.10 × 0.50–0.80 mm, oblong, oblong-obovate; testa semi-glossy, orange-brown to dark brown; surface coarsely reticulate.

Similar taxa

Morphologically Kunzea triregensis is mostly likely to be confused with Kunzea amathicola and K. linearis (de Lange 2014). In particular the distinctive elongate botrya of K. triregensis is seen otherwise only in K. amathicola, a species from which K. triregensis differs by its homophyllous growth habit, and lanceolate to narrowly lanceolate leaves. The peculiar ability of the K. triregensis inflorescence to produce, albeit infrequently, additional lateral elongate or reduced corymbiform botrya from the base and terminus of the main botryum further distinguishes it from K. amathicola. Kunzea tiregensis differs from K. linearis by its more openly vegetated, less densely crowded branchlets, and by the leaves which in K. triregensis are consistently lanceolate to narrowly lanceolate rather than linear. Further, in K. triregensis the thick bands of marginal and abaxial midrib hairs meet at the leaf apex, whereas in K. linearis the marginal hairs meet just short of the adaxial face of the apex and the abaxial midrib hairs stop short of the apex. The inflorescence of K. triregensis is consistently elongated and the flowers are usually widely spaced (only in stressed conditions becoming crowded). In contrast, the inflorescence of K. linearis is usually a condensed, densely packed spiciform botryum. Other distinctions are offered by de Lange (2014) who also discusses this species peculiar past confusion with the Aotea Island / Great Barrier Island endemic Kunzea sinclairii.

Flowering

July–May

Flower colours

White

Fruiting

October–May

Propagation technique

Very easy from fresh seed. Can be grown from semi-hardwood and hardwood cuttings. Although scarce in cultivation Kunzea triregensis has proved to be an excellent fast growing tree, ideal for street side verges. It is very tolerant of drought and a range of soils provided it has good drainage. It does not appear to be especially cold sensitive.

Threats

Kunzea triregensis as K. aff. ericoides (e) (AK 226797; Three Kings) is appropriately listed by de Lange et al. (2013) as ‘At Risk/Naturally Uncommon’ qualified ‘IE’ (Island Endemic) and ‘OL’ (One Location) because the species is confined to one island group. In its island habitat Kunzea triregensis forms the dominant vegetation of Manawatawhi / Great Islands.

Myrtle Rust (Austropuccinia psidii) is an invasive fungus which threatens native myrtle species - learn more myrtlerust.org.nz

Etymology

kunzea: Named after Gustav Kunze (4 October 1793, Leipzig -30 April 1851), 19th century German botanist from Leipzig who was a German professor of zoology, an entomologist with an interest mainly in ferns and orchids

triregensis: Literally ‘of the Three Kings’ - this species is endemic to the Three Kings Islands

Attribution

Fact Sheet prepared for NZPCN by P.J. de Lange 25 August 2014. Description modified from de Lange (2014).

References and further reading

de Lange, P.J.; Rolfe, J.R.; Champion, P.D.; Courtney, S.P.; Heenan, P.B.; Barkla, J.W.; Cameron, E.K.; Norton, D.A.; Hitchmough, R.A. 2013: Conservation status of New Zealand indigenous vascular plants, 2012. New Zealand Threat Classification Series 3. Department of Conservation, Wellington.

de Lange, P.J. 2014: A revision of the New Zealand Kunzea ericoides (Myrtaceae) complex. Phytokeys 40: 185p doi: 10.3897/phytokeys.40.7973.

Citation

Please cite as: de Lange, P.J. (Year at time of access): Kunzea triregensis Fact Sheet (content continuously updated). New Zealand Plant Conservation Network. https://www.nzpcn.org.nz/flora/species/kunzea-triregensis/ (Date website was queried)

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