Chatham Island toetoe
Cortaderia turbaria Connor
Vascular – Native
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.
2n = 90
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 | Threatened – Nationally Endangered | Qualifiers: CD, IE, RF, RR
Previous conservation statuses
2009 | Threatened – Nationally Endangered | Qualifiers: CD, RF, IE, RR
2004 | Threatened – Nationally Critical
Endemic to the Chatham Islands. Found on both Chatham and Pitt Islands.
A species usually found on the margins of slowly flowing streams draining peat bogs, or on lake margins. It has also been found in light wells created by tree falls within swamp forest.
Tall, hermaphrodite, tussock of wetlands. Leaf-sheath inter-nerves and margins conspicuously hairy. Ligule 2 mm. Collar underside glabrous, top side sparsely hairy. Leaf-blade up to 1.5 x 0.15 m, glaucous, tapering to long, thin point; under surface with long inter-rib hairs, upper surface with conspicuous, dense, weft of hairs at base otherwise glabrescent; lamina margins scabrid. Culm to 2 m, internodes glabrous. Inflorescences 400-800 mm, dense, plumose, drooping, branches and pedicels covered in copious long hairs, these longer than spikelet. Spikelets with 2 florets. Glumes equal, 25 mm or less, 1-nerved, thin; upper with 10 mm or less hairs, lower less hairy or glabrous. Lemma 9 mm. Palea 7 mm, long-hairy, apex hair-tipped, keels ciliate. Callus hairs 3 mm. Rachilla 1 mm, glabrous. Anthers 1.7-2.6 mm. Gynoecium with ovary to 0.8 mm, stigma-styles 2.5 mm. Seeds ovate, rugose, 3 mm.
Austroderia turbaria is the only species of the genus native to the Chatham islands. It is allied to A. splendens Connor, which is endemic to the northern North Island. From that species it can be distinguished by its long-hairy leaf-sheaths, and hermaphrodite flowers. Austroderia fulvida and A. richardii have also been planted on the Chatham Islands, again A. turbaria is easily distinguished from these by its hairy leaf-sheaths and hermaphrodite flowers.
October - January
December - July
Florets are wind dispersed (Thorsen et al., 2009).
Austroderia turbaria is easily cultivated and does best in a sunny, sheltered site on permanently damp, peaty or acid soil. It is inclined to be rather short-lived (2-5 years) and will not tolerate drought. It is easily grown from fresh seed which germinates readily. Seed appears to have little viability if stored for longer than a year.
This plant is one of the most threatened in the Chathams archipelago. As of 2005 there are ten wild populations and 344 mature plants known. These occur in often small and widely fragmented locations and so remain highly vulnerable to catastrophic events. Browsing and trampling by cattle is a major problem, and the species is also greedily devoured wherever sheep and pigs can reach it. There is some indication that fungal diseases such as Fusarium wilt may have been responsible for the recent near loss of this species from the northern part of Chatham Island. Fire, floods and competition from other vegetation are also threats. The species is also at some risk through hybridism with species of New Zealand toetoe that have been introduced to the Chatham Islands.
Where To Buy
Occasionally sold by some specialist native plant nurseries.
Fact sheet prepared for NZPCN by P.J. de Lange 1 October 2006. Description adapted from Edgar & Connor (2000).
References and further reading
Edgar, E.; Connor, H.E. 2000: Flora of New Zealand. Vol. V. Grasses. Manaaki Whenua Whenua Press, Christchurch.
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
Please cite as: de Lange, P.J. (Year at time of access): Austroderia turbaria Fact Sheet (content continuously updated). New Zealand Plant Conservation Network. https://www.nzpcn.org.nz/flora/species/austroderia-turbaria/ (Date website was queried)