Species

Olearia traversiorum

Etymology

Olearia: Derived from the latinised name (Olearius) of the 17th century German botanist Adam Oelenschlager
traversiorum: Named after William Thomas Locke Travers (1819-1903) who was an Irish lawyer, magistrate, politician, explorer, naturalist, photographer. He lived in New Zealand from 1849 and was a fellow of the Linnean Society.

Common Name(s)

Chatham Island akeake, Chatham Island tree daisy

Current Conservation Status

2012 - Threatened - Nationally Vulnerable

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 - Threatened - Nationally Vulnerable
2004 - Range Restricted

Qualifiers

2012 - CD, DP, IE, RF
2009 - CD, DP, IE, RF

Authority

Olearia traversiorum (F.Muell.) Hook.f.

Family

Asteraceae

Brief Description

Small tree with oval dark green leathery leaves that are whiteish underneath and persistent seed heads inhabiting drier sites on the Chatham Islands. Leaves 15-80mm long by 10-46mm wide. Flowers cream or brownish, in small clusters, appearing late spring. Seeds fluffy.

Flora Category

Vascular - Native

Plant Code

OLETRA

Structural Class

Dicotyledonous Trees & Shrubs

Synonyms

Eurybia traversii F.Muell., Olearia traversii (F.Muell.) Hook.f. ortho. var.

Distribution

Endemic. Chatham Islands

Habitat

A tree common of lowland forests, now most commonly found on dune systems. It also occurs along the edge of larger lagoons and lakes (but only in free draining soils) and sometimes on cliff tops.

Features

Tree 12–18 m tall; trunks up to 1 m diameter, upright to spreading; occasionally with epicormic shoots. Bark light grey, becoming coarsely fibrous, deeply fissured, and rough textured on trunk and old branches; branchlets quadrangular, stout, 2.0–2.6 mm diameter. Leaves opposite, lamina 15–80 × 10–46 mm, broadly elliptic, obovate, broad-obovate, or occasionally elliptic; upper surface dark green, glossy, midrib raised and prominent; underside with dense appressed, off-white, tomentum; apex subacute to obtuse, with a small apiculus; base cuneate to obtuse, sometimes attenuate; petiole 5–10 mm long, covered in dense appressed tomentum. Inflorescence an axillary panicle with 5–68 capitula, persistent after fruiting; primary branches in 3–6 opposite pairs; lower pairs of branches with 3–19 capitula, upper 1–3 branches each with 1–3 capitula. Bracts subtending primary branches, 2.0–5.0 × 0.8–1.2 mm, lanceolate to narrowly triangular, apex subacute. Bracteoles 2.0–3.0 × 0.5–0.8 mm, margin entire, apex subacute. Capitulum 5.0–7.0 mm long, involucre cylindric; involucral bracts 10–14, 1–2-seriate, upper surface glabrous, underside moderately to densely hairy, margins entire, apex acute to subacute; outer bracts 2.0–2.8 × 0.8–1.1 mm, narrowly triangular to elliptic; inner bracts 3.3–4.0 × 0.6–1.1 mm, lanceolate to narrow triangular. Florets 7–11 per capitulum; corolla usually cream to buff, sometimes pale yellow. Pistillate florets 3–5. Hermaphrodite florets 3–7. Style 4.5–5.5 mm long; stigmatic arms 0.4–0.6 mm long. Ovary 0.8–1.6 × 0.4–0.6 mm. Anthers 1.3–1.5 mm long, white, dehiscent in bud, apex apiculate; filaments 0.5–0.6 mm long, inserted at top of corolla tube. Seeds 1.2–2.1 × 0.6–0.8 mm, narrow-cylindric, light brown, with 4–5 pale ribs, sparsely to moderately hairy; pappus 2.2–3.3 mm long, off-white to buff, finely scabrid.

Similar Taxa

Olearia telmatica is closely related. It differs from akeake by its restriction to permanently flooded swamp habitats, smaller stature, slender trunk, narrower leaves, lemon-yellow and less hairy corolla, less branched inflorescence with fewer capitula, fulvous hairs on the inflorescence, earlier flowering season, readily dispersed seed, and abscising inflorescences

Flowering

November – January

Flower Colours

Cream,Yellow

Fruiting

January – June

Propagation Technique

Easily grown from semi-hardwood cuttings and fresh seed. Fast growing and an excellent shelter belt. This species rarely flowers in the northern part of New Zealand.

Threats

The wood of this tree is used for fence posts and as firewood.

Chromosome No.

2n = 108

Endemic Taxon

Yes

Endemic Genus

No

Endemic Family

No

Where To Buy

Can be purchased from Oratia Native Plant Nurseries (info@oratianatives.co.nz)

   

Attribution

Description based on Heenan et al. (2008). New Zealand Journal of Botany 46(4): 567-583.

This page last updated on 3 Jan 2014