Carex coriacea
Common name
cutty grass, rautahi
Synonyms
Carex ternaria var. pallida Cheeseman, C. ternaria f. pallida (Cheeseman) Kük.
Family
Cyperaceae
Flora category
Vascular – Native
Endemic taxon
Yes
Endemic genus
No
Endemic family
No
Structural class
Sedges
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.
CARCOR
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.
Source: NZTCS and licensed by DOC for reuse under the Creative Commons Attribution 4.0 International licence.
2017 | Not Threatened
Previous conservation statuses
2012 | Not Threatened
2009 | Not Threatened
2004 | Not Threatened
Distribution
Endemic. New Zealand: North, South and Stewart Islands from Pureora and the Kaingaroa Plain south. In the South Island widespread though more common on the eastern side.
Habitat
Coastal to alpine (up to 1600 m a s.l.). Usually in damp seepages in grassland or on swampy river flats, sometimes a persistent weed in pasture.
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).
FACW: Facultative Wetland
Usually is a hydrophyte but occasionally found in uplands (non-wetlands).
Features
Rhizomatous; summer-green perennial, in coarse yellow-green, glossy, distant tufts, 0.2-1.2 m high, borne on a hard, woody rhizome 5-12 mm diameter. Culms 1.5-3.0 mm diameter, trigonous, scabrid below inflorescence; basal sheaths membranous, grey-brown, yellow-brown or dull red-brown, margins shredding into fibres wrapped round the culm. Leaves much > culms, 4-9 mm wide, double-folded, stiff, coriaceous, hard, glossy, margins closely scabrid. Spikes 8-15, pendulous on filiform peduncles usually much > spike; 2-6 uppermost spikes male, 2-3 mm diameter, glumes hardly awned; remaining spikes female, occasionally male at the top, geminate or ternate, rarely quinate, lower spikes the longest, 20-100 × c.5 mm. Glumes (excluding awn) < utricles, narrow-ovate or obovate, with a short hispid awn, coriaceous, red-brown, margins narrow-hyaline; midrib broad, 3-nerved, light brown. Utricle 1.9-3.3 × 1.2-2.0 mm, unequally biconvex, orbicular or broadly ovoid, yellow-green or light grey-brown, green towards the tip, faintly nerved but with prominent lateral ridges, margins smooth, gradually narrowed to a short beak c.0.3 mm long, orifice entire; stipe c.0.5 mm long. Stigmas 2. Nut slightly < 1.5 mm long, c.¾ length of utricle, biconvex, orbicular or oblong-ovoid, dark brown to black.
Similar taxa
Carex coriacea is allied to C. ternaria Boott, C. lessoniana Steud. and C. geminata Schkuhr. From all these species it is best distinguished by the glossy, yellow-green leaves, smooth, yellow-green utricle and by the nut which is usually c.3/4 the length of the utricle. Further Carex ternaria is confined to the Chatham and Subantarctic islands outside the range of C. coriacea, while ecologically C. lessoniana and C. geminata are more typical of lowland wetlands or damp sites within forest. Only rarely do the ranges of C. lessoniana and C. geminata overlap with C. coriacea.
Flowering
October - December
Fruiting
December - May
Life cycle
Nuts surrounded by inflated utricles are dispersed by granivory and wind (Thorsen et al., 2009).
Propagation technique
Easily grown from fresh seed and by the division of established plants. However, because of its extensively rhizomatous nature it needs plenty of room to spread. Although a wetland species C. coriacea will grow well in most soils and moisture regimes. Does best in full sun.
Etymology
carex: Latin name for a species of sedge, now applied to the whole group.
coriacea: Leathery
Attribution
Fact Sheet prepared by P.J. de Lange (10 August 2006). Description adapted from Moore and Edgar (1970)
References and further reading
Moore, L.B.; Edgar, E. 1970: Flora of New Zealand. Vol. II. 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 2009 Vol. 11 No. 4 pp. 285-309
NZPCN Fact Sheet citation
Please cite as: de Lange, P.J. (Year at time of access): Carex coriacea Fact Sheet (content continuously updated). New Zealand Plant Conservation Network. https://www.nzpcn.org.nz/flora/species/carex-coriacea/ (Date website was queried)