Entelea arborescens
Common name
whau
Synonyms
Apeiba australis A.Rich.
Family
Malvaceae
Flora category
Vascular – Native
Endemic taxon
Yes
Endemic genus
Yes
Endemic family
No
Structural class
Trees & Shrubs - Dicotyledons
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.
ENTARB
Chromosome number
2n = 32
Current conservation status
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.
2012 | Not Threatened
Previous conservation statuses
2009 | Not Threatened
2004 | Not Threatened
Brief description
Small bushy tree with large very thin jagged leaves with three points towards the tip attached to a stalk near the leaf base. Wood very light. Leaves 10-25cm long. Flowers white with yellow filaments, in flat clusters. Fruit distinctive, round, covered with long spines.
Distribution
Endemic. Three Kings, North (including Little and Great Barrier Islands) and South Islands. In the North Island, whau is locally common from Te Paki to about Kawhia and Mahia Peninsula south of there it is known from a few sites in the northern Taranaki, eastern Wairarapa, Cape Palliser, at Paekakariki and Wellington. In the South Island it is confined to the Golden Bay area of North-West Nelson. Whau naturalises easily and has become established in many places, especially around baches and urban plantings.
Habitat
Coastal to lowland forest or shrubland. Usually in open sites such as around recent slips, tree falls, cliff faces, boulder slopes, sand dunes or on the margins of streams, rivers, lagoons and lakes. Mostly near the coast however it may occur well inland in some places e.g., the Waikato River near Hamilton, Rotorua. Some inland and southern North island occurrences are thought to be derived from deliberate plantings by Maori.
Features
Shrub or small spreading tree up to c. 8 m tall; trunk up to 0.25 m dbh; wood-weight very light; bark firm,grey, tearing in long fibrous strips when cut. branches numerous, upright than spreading; branchlets, leaves, petioles, inflorescences densely clad in soft whitish branched hairs; leaf-scars oval or lunate. Leaves alternate, softly membranous (wilting readily if picked), green, bright green to yellow green, ± glossy, veination distinct when fresh or dry; petioles 80-300 mm long, stout; stipules linear-acuminate, ± persistent. Lamina 50-100-150(-300) × 50-100-150-(260) mm, obliquely very broad-ovate, abruptly acuminate, cordate at base, margins doubly crenate-serrate, sometimes obscurely lobed, 3-5-7-subpalmately lobed. Inflorescence a subumbellate many-flowered cyme. Flowers (3-)4-5-merous. Peduncle 100-300 mm long, stout, pedicels 10-40 mm long. Sepals free, 8-10-12 mm long, narrowly lanceolate to triangular, acuminate; petals (3)-4-5, 10-30 × 10-30 mm, orbicular to suborbicular, white, crumpled. Stamens numerous, mostly free sometimes connate at base, filaments 10-18(-20) mm long, white, anthers versatile, yellow. Ovary 5-10 mm long, broadly to narrowly globose or ovoid, hispid, 5-7-locular, ovules numerous, style simple, stigma ± globular to broadly capitate, fringed or toothed. Fruit a bristly capsule 20-35 mm diameter, subglobose to globose, black to charcoal when ripe, invested by numerous, rigid, spinose, black to charcoal coloured hairs 15-25 mm long. Seeds numerous, 1.9-2.9 mm long, obovate, elliptic to broadly elliptic, glarbous, surface granular, orange-yellow, pale brown, or orange-brown. Description of seeds by Webb & Simpson (2001).
Similar taxa
None.
Flowering
August - November
Flower colours
White, Yellow
Fruiting
December - June
Life cycle
The spiny capsules may be dispersed by animals (Thorsen et al., 2009). However, they are also buoyant in water, and may aid in wind dispersal as the mature capsules are often blown along beaches and dunefields. Entelea fruits are often found washed up along tidal creeks,
Propagation technique
Easily grown from seed which germinates readily. A very fast growing small tree ideal for coastal situations. Does best when planted in sunny, free draining soils but is also tolerant of semi-shade and seasonally damp ground. Reasonably drought tolerant. Cold sensitive. Whau is one of the fatest growing native trees and is an excellent plant to use in coastal situations to establish shelter for other plantings. Whau is however, rather short-lived (up to 15 years) although once established if often self sows.
Threats
Not Threatened. However, recent field work gathering samples for a Marsden study into the possible past use of whau by maori indicates that whau is much less common in the North island than it once was. browsing pressure from cattle, goats and horses, clearance of coastal scrub of housing and the spread of invasive woody shrubs and trees into many northern coastal areas may be threatening some populations.
Etymology
entelea: Perfect (the pistil and stamens are in the same flower)
arborescens: Becoming a tree
Attribution
Fact Sheet Prepared for NZPCN by: P.J. de Lange 10 February 2011. Description of seeds by Webb & Simpson (2001).
References and further reading
Webb, C.J.; Simpson, M.J.A. 2001: Seeds of New Zealand Gymnosperms and Dicotyledons. Christchurch, Manuka Press.
Thorsen, M. J.; Dickinson, K. J. M.; Seddon, P. J. 2009. Seed dispersal systems in the New Zealand flora. Perspectives in Plant Ecology, Evolution and Systematics 11: 285-309
NZPCN Fact Sheet citation
Please cite as: de Lange, P.J. (Year at time of access): Entelea arborescens Fact Sheet (content continuously updated). New Zealand Plant Conservation Network. https://www.nzpcn.org.nz/flora/species/entelea-arborescens/ (Date website was queried)