Eleocharis gracilis
Common name
slender spike sedge
Synonyms
Eleocharis gracilis R.Br. var. gracillima Hook.f.; Eleocharis gracilis R.Br. var. radicans Hook.f.; Eleocharis cunninghamii Boeck.; Eleocharis gracillima (Hook.f.) Hook.f.; Eleocharis hookeri Boeck.
Family
Cyperaceae
Flora category
Vascular – Native
Endemic taxon
No
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.
ELEGRA
Chromosome number
2n = 20
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
Distribution
Indigenous. In New Zealand present in the North, South, Chatham and Stewart Islands. Present in Australia and Norfolk Island.
Habitat
Coastal to subalpine. A species of usually open situations on permanently damp ground such as lake, pond, tarn, stream and river sides, and wetlands.
Features
Terrestrial or semi-aquatic sedge forming green to red-green tufts. Rhizomes widely creeping, 1-3 mm diameter, loosely ensheathed at each nodes by conspicuous dark maroon, obtuse bracts with broad membranous margins. Culms densely tufted to widely spaced (or set close together in a linear series), 20.0-400.0 x 0.5 mm, erect or curved; sheaths membranous, with maroon to purple markings and an oblique orifice. Spikelets conspicuous, 3-8 x 1-4 mm, 5-20-flowered, ovoid to almost lanceolate, subacute. Glumes oblong, obtuse, 1-nerved, membranous, margins often very broad. Hypogynous bristles 4-8, usually > nut. Stamens 3. Style 3-fid. Nut slightly < 1.5 mm long, slightly , 1 mm diameter, trigonous, obovoid, light to dark brown, smooth, surmounted by the pyramidal, persistent style-base.
Similar taxa
Most likely to be confused with Eleocharis pusilla R.Br. from which it differs by widely creeping rather than ascending rhizome; by the spikelets > 3 mm long (rather than 2.5-3 mm long); hypogynous bristles 4-8 (rather than absent or occasionally 2-3); and by the smooth nut (rather than nut with the surface covered in prominent vertical ribs and fine transverse bars). Eleocharis gracilis and E. pusilla may at times be sympatric.
Flowering
August - January
Fruiting
October - May
Life cycle
Bristly nuts are dispersed by water and possibly wind and attachment (Thorsen et al., 2009).
Propagation technique
Easily grown from fresh seed and rooted pieces. Prefers a permanently damp situation in full sun.
Etymology
eleocharis: Charm of the swamp
gracilis: Slender
Attribution
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 11: 285-309