None (described in 1989)
Vascular – Native
Herbs - Dicotyledons other than Composites
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 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 | At Risk – Naturally Uncommon | Qualifiers: Sp
Previous conservation statuses
2012 | At Risk – Naturally Uncommon | Qualifiers: Sp
2009 | At Risk – Naturally Uncommon
2004 | Not Threatened
Endemic. New Zealand: North Island (eastern Tongariro National Park, southern Kaimanawa Mountains, Kaweka Range, Taruarau River, Otupae Range, north-west Ruahine Range)
A species of relatively open montane Nothofagus forest and scrub especially that dominated by kahikatoa (Leptospermum scoparium J.R.Forst. et G.Forst.), and in open disturbed sites near the bush line.
Slender suffruticose perennial with dark brown subterranean stems < 2 mm diam. Branches prostrate and < 500 mm long or erect and < 50 mm long, c.0.7 mm diameter, brown, hirsute, epidermis flaking with age; internodes < 35 mm long on prostrate stems. Leaves hairy; stipules 2-6 mm long, margins, tips and undersides hairy, free portion linear, entire or bifid, < sheath; leaflets 3 or 4 pairs, the distal leaflet and 2 upper pairs obovate to suborbicular in outline, truncate at apex, shallowly cuneate at base, 2-10 × 2-6 mm; upper surface dull green, glabrous, smooth, with secondary venation indistinct; lower surface pale, glaucescent, the veins with appressed hairs; teeth 7-9 with margins thickened and recurved, hydathodes pink. Basal leaflet pairs less than ½ the size of the penultimate pair, or linear and smaller than stipule lobes. Hairs simple, unicellular, < 1.5 mm long, on stipules, rachis and leaflets. Scapes terminal on short shoots, 40-130 mm long at flowering, hardly elongating as fruit matures, c.0.5 mm diameter, moderately hairy, pale brown. Scape bract linear or foliose, occasionally subtending a single floret. Capitulum 4-6 mm diameter at flowering, 10-15 mm diameter (including spines) at fruiting. Bracteoles on receptacle linear, c. 3 mm long, with hairy margins. Florets c. 40-50, minutely stipitate. Hypanthium c.1 mm long, enclosing perigynous ovary, densely hairy, bearing 4 barbed spines which reach above the hypanthium rim. Sepals 4, arising from hypanthium rim, shortly joined at base, c. 1.5 mm long, elliptic, narrowed and thickened at tip, sparsely hairy on underside. Petals 0. Stamens 2; filaments unequal, up to 2 mm long; anthers 0.3 x 0.5 mm, white. Style 1, 1.5 mm long, including white, fimbriate stigma 0.6 mm broad and protruding from aperture of hypanthium. Fruit indehiscent with a single achene enclosed in the hypanthium, obconic, c.2.0 × 1.2 mm, brown, moderately hairy, 4-ribbed; spines 1 per rib, slender, 4-6 mm long, pale rose or brown, bearing a single rank of translucent, retrorse barbs at tip.
Allied to A. anserinifolia (J.R.Forst. et G.Forst.) J.B.Armstr. from which it differs by the leaves < 50 mm long, spathulate; leaflet pairs 3-4, these abruptly reduced in size below the 2 uppermost; leaflet lamina obovate to suborbicular with the teeth, crenate, glossy, 3-5 per side; hairs appressed, absent from upper surface, predominantly on midrib and main veins of lower surface; by the veins indistinct on the upper leaflet surface; by the linear, entire, rarely bifid stipules; by the smaller capitula 4-6 mm diameter at flowering 10-15 mm diameter at fruiting; and small fruits (c.2.0 × 1.5 mm) and spines (4-6 mm long).
December – February
January – May
Easily grown from fresh seed and from rooted pieces.
A Naturally Uncommon endemic of the Central North Island. Although it is not known to be threatened it is not generally that common either
acaena: From the Greek ‘akanthos’ thorn, referring to the spiny calyx that many species have
Where To Buy
Not Commercially Available
Description from Macmillan (1989).
References and further reading
Macmillan, B.H. 1989: Acaena juvenca and Acaena emittens (Rosaceae) - two new species from New Zealand. New Zealand Journal of Botany 27: 109-117.