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Ixerba: an anagram of brexia
brexioides: like a Brexia, a South African shrub
Tawari, whakou (flowers)
Current Threat Status
2012 - Not Threatened
Previous Threat Status
2009 - Not Threatened
2004 - Not Threatened
Ixerba brexioides A.Cunn.
Bushy tree bearing narrow thick serrated dark green leaves and clusters of white flowers with a prominent green centre inhabiting the upper North Island. Leaves 6-16cm long by 1-4cm wide. Flowers 2.5-3.5cm wide. Fruit a green capsule, splits to reveal the black seeds on a fleshy orange and white base.
Vascular - Native
Endemic. New Zealand, North Island ( widespread from about Kaitaia south to Waitomo, Paeroa Range and Te Urewera).
Often but not exclusively an associate of kauri (Agathis australis) forest. Also common in montane cloud forest. Prefers shaded or sheltered sites, often near streams and in permanently damp ground. Can be locally abundant in some areas but otherwise it is rather sporadic in its occurrences,
Small tree up to 10 m tall with spreading crown. Trunk 0.2-0.4 m diam., bark dark brown to grey-brown. Branchlets, leaves and inflorescences clade in fine pubescence when young. Petioles, stout, fleshy, 20 mm long. Leaves yellow-green to dark-green above, paler beneath, somewhat fleshy, distinctly leathery, 60-160 x 10-40 mm, lanceolate to elliptic or oblanceolate, apex acute to subacute, margins bluntly and coarsely serrated. Apex of each serration surmounted with a small gland. Juvenile leaves often reddish, linear-lanceolate. Inflorescence a terminal subumbellate 5-10-flowered panicle. Flowers 25-35 mm diam, furnished with plenty of nectar. Sepals broad-ovate, downy, 5-6 mm long; petals white, obovate-spathulate, clawed, 15-20 mm long, inserted below a 5-lobed disc; stamens 5 exserted, alternating with disc lobes; style twisted, 5-grooved. Capsule leathery, broadly ovoid, 5-celled, seeds orange, 5 mm long, very glossy.
A very distinctive tree easily recognised by the leathery, somewhat fleshy, lanceolate leaves, whose serrations are glandular-tipped, large, showy, white flowers, and distinctive capsules which split to reveal rather large glossy black seeds.
(September-) October-November (-December)
Main Flower Colour
Other Flower Colour
November - January (-March)
Difficult to grow. It has been suggested that the species is mycorrhizal, and there is some evidence that if planted in association with Griselinia littoralis, Ixerba grows very easily.
2n = 50
Ixerba has been placed in a range of families. Allan (1961) placed it in the Escallionaceae, however this placement was at best doubtful, and so it was placed in 2008 into its own family the monogeneric Ixerbaceae. it was then, for a very short time New Zealand's only endemic vascular plant family. However, in 2009 the Ixerbaceae was merged with the New Caledonian Strasburgiaceae (APG III 2009).
References and further reading
Allan, H.H. 1961: Flora of New Zealand. Vol. I. Wellington, Government Printer.
APG III 2009. An update of the Angiosperm Phylogeny Group classification of the orders and families of flowering plants: APG III. Botanical Journal of the Linnean Society 161: 105-121.
Gardner, R.O. 1997. Notes on the tawari Ixerba brexioides(Escalloniaceae). Auckland Botanical Society Journal, 52: 45-47.
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
This page last updated on 30 May 2015