Vascular – Native
Herbs - Dicotyledons other than Composites
2n = 24
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: DP, SO, Sp
Previous conservation statuses
2012 | At Risk – Naturally Uncommon | Qualifiers: SO, Sp
2009 | Not Threatened
2004 | Not Threatened
Indigenous: Kermadec (Raoul, Macauley), North, South and Chatham (Rekohu only) Islands. Also Australia and New Guinea.
Coastal to montane, in grassland, coastal shrub, grey scrub, open sites in forest, on cliff faces and associated rubble slopes. Occasionally in lawns and waste ground in urban situations.
Herb with prostrate or decumbent stems to 450 mm, glabrescent to moderately antrorse-hairy, sometimes with patent septate hairs present; tap root poorly developed; bulbils absent. Leaves cauline, 3-foliolate; leaflets subsessile, cuneate-obovate, 3-16 x 5-20 mm, bilobed, glaucous, glabrous to pubescent above, often densely hairy below, margins ciliate, sinus to 1/3 leaflet length, lobes oblong to slightly obovate, apices rounded, 3-10 mm apart; petioles 40-900 mm long, with simple antrorse hairs; stipules conspicuous, 1-3 mm long, apex rounded, ciliate. Inflorescences axillary 1-6-flowered; peduncles mostly shorter than leaves, sparsely antrorse-hairy; pedicels delfexed in fruit. Sepals oblong, 2-4 mm long, often ciliate; petals 4-12 mm long, yellow. Capsule cylindric, 5-16 mm long, erect, densely covered in retrorse-hairs interspersed with sparse, longer, patent septate hairs; seeds very compressed, smooth or shallowly ribbed.
Distinguished from Oxalis corniculata by the copious antrorse rather than retrorse stem and petiole hairs, smaller rounded, obtuse tipped, rather than very large, bluntly truncate stipules, which are evenly covered in hairs with the margins distinctly hairer, rather than glabrescent to evenly hairy. The leaves are copiously but finely hairy on both surfaces rather than hairy above glabrous beneath and usually glaucescent, rather than green, dark green, red-green or purple. The seeds of O. corniculata are distinctly ribbed, those of O. thompsoniae are not.
September - June
July - June
Like many Oxalis species, inclined to be weedy in cultivation. This species is locally a problem in some parts of New Zealand but is rarely as weedy as the closely allied O. corniculata.
oxalis: From the Greek word oxus meaning acid or sharp
Where To Buy
Not commercially available
Fact sheet srepared for NZPCN by P.J. de Lange (10 August 2009). Description from herbarium specimens and live plants.
NZPCN Fact Sheet citation
Please cite as: de Lange, P.J. (Year at time of access): Oxalis thompsoniae Fact Sheet (content continuously updated). New Zealand Plant Conservation Network. https://www.nzpcn.org.nz/flora/species/oxalis-thompsoniae/ (Date website was queried)