North Westland Snow Tussock
Danthonia raoulii var. teretifolia Petrie; Danthonia rigida var. teretifolia (Petrie) Zotov
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 = 42
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 | At Risk – Declining | Qualifiers: RR
Previous conservation statuses
2009 | At Risk – Declining | Qualifiers: RR
2004 | Range Restricted
Endemic. New Zealand: North Westland (Denniston and Stockton Plateaus).
Montane to subalpine. Locally common in scrub, tussock grassland and swampy ground overlying coal measures
Tall, rush-like, red tussock with swollen bases from rootstock clothed in old leaf-sheaths, leaves persistent, ultimately falling below sheath with one fracture. Leaf-sheath to 150 mm, dark brown, entire, persistent, internerves hairy but often appearing glabrous, margin long hairy above, apical tuft of hairs to 4 mm. Ligule to 0.5 mm. Leaf-blade to 700 × 1 mm, acicular rush-like, finally falling with top part of sheath, abaxially glabrous sometimes with long hairs below aside prominent, shining, hollow keel, becoming glabrous, adaxially with weft of long hairs at base, prickle-teeth above; margin with long hairs below glabrous above. Culm to 900 mm, internodes glabrous. Inflorescence to 200 mm, open, spikelets on long, pulvinate, flexuous branches; rachis and branches sparsely short hairy below becoming glabrous except for few hairs at axils and below spikelets. Spikelets of up to 6 purpled florets. Glumes glabrous, < adjacent lemma lobes; lower to 11 mm, 3-nerved, upper to 12 mm, 5-nerved. Lemma to 5.5 mm; hairs dense on margin, very few aside central nerve, glabrous elsewhere, < sinus; lateral lobes up to 4 mm, including awn up to 2.5 mm; central awn up to 10 mm, reflexed from 1 mm flat column. Palea to 6 mm. Callus to 1 mm, hairs to 3 mm. Rachilla to 0.8 mm. Lodicules to 0.5 mm. Anthers to 3.5 mm. Ovary to 0.5 mm; stigma-styles to 2 mm. Seeds to 2 mm
October - December
November - April
Florets are wind dispersed (Thorsen et al., 2009).
Easily grown in an acidic, damp soil in full sun or partial shade. Plants dislike drying out and will not tolerate drought or long periods of humidity. Very slow growing. An unusual tussock whose rush-like foliage is very attractive.
Widespread within the coal measures of North Westland. In most places it is secure, however, open cast coal mining now threatens some large populations.
chionochloa: Snow grass
Description modified from Edgar and Connor (2000)
References and further reading
Edgar, E.; Connor, H.E. 2000: Flora of New Zealand. Vol. V. Grasses. Christchurch, Manaaki Whenua Press. 650 pp.
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