kutakuta, spikes of doom, bamboo spike sedge, tall spike sedge
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 = 100
Current conservation status
The threat classification 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) – more information about this can be found on the NZTCS website 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. Please note, threat classifications are often suggested by authors when publications fall between NZTCS assessment periods – a suggested threat classification status has not been assessed by the NZTCS panel.
2017 | Not Threatened | Qualifiers: SO
Previous conservation statuses
2012 | Not Threatened
2009 | Not Threatened
2004 | Not Threatened
Coastal to lower montane (but mainly in lowland areas). Preferring sunny situations where it usually grows in still deep water such as along lake and pond margins often amongst Raupo (Typha orientalis C.B.Presl), Baumea articulata (R.Br.) Blake. Rarely bordering slowly flowing streams and rivers, or in burn pools and damp depressions within peat bogs.
Wetland plant indicator status rating
Information derived from the revised national wetland plant list prepared to assist councils in delineating and monitoring wetlands (Clarkson et al., 2021 Manaaki Whenua – Landcare Research Contract Report LC3975 for Hawke’s Bay Regional Council). The national plant list categorises plants by the extent to which they are found in wetlands and not ‘drylands’. The indicator status ratings are OBL (obligate wetland), FACW (facultative wetland), FAC (facultative), FACU (facultative upland), and UPL (obligate upland).
OBL: Obligate Wetland
Almost always is a hydrophyte, rarely in uplands (non-wetlands).
Rhizome 10-15 mm diameter, stout and lignaceous, creeping. Culms 0.3-1.2 m long, 4-12 mm diameter, usually close-packed, linear with obvious internal transverse septa set at regular intervals of 10-100 mm, apices blunted-ended unless fertile. Basal sheaths grey. chartaceous with an oblique orifice; roots 2 mm diameter, red-brown, in a group of up to 5 from the base of each culm. Spikelet 20-70 x 5-10 mm, cylindrical with an acute apex. Lowest glume sterile, almost completely surrounding base of spikelet, very short; upper glumes numerous, imbricate, 6-8 mm long, obovate-oblong, obtuse, not keeled but with a strong median nerve and numerous fine lateral nerves. Hypogynous bristles 6-10, usually greater than nut, with rather large, sparse, retrorse teeth. Stamens 3, Style 3-fid, occasionally stigmas 2, or all connate to the apex. Nut 2.0-2.5 mm long (excluding persistent style-base), orbicular, biconvex, the surface covered with hexagonal reticulations, pale brown, surmounted by the persistent, dark brown, conic, swollen base of the style.
None. Easily distinguished from other species of Eleocharis by the much large soft, hollow, transversely septate culms. Could be confused with sterile species of Baumea articulata but that species has much longer (up to 2 m), dark green to almost brown green, rigidly firm culms with acute rather than blunt-ended apices
August - December
November - May
Bristly nuts are dispersed by water and possibly wind and attachment (Thorsen et al., 2009).
Can be tricky. Fresh seed germinates best if allowed to float on water overlying potting mix, gradually reduce the water level so that the germinating plants can naturally “float” on to the underlying soil. Plants do best if their rootstock is submerged.
eleocharis: Charm of the swamp
sphacelata: Diseased (appearance of the spike)
The long culms, when dried, were sometimes used by Maori for their tukutuku panels.
Description adapted from Moore and Edgar (1970)
References and further reading
Moore, L.B.; Edgar, E. 1970: Flora of New Zealand. Vol. I. Government Printer, Wellington.
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