Oxalis thompsoniae B.J.Conn & P.G.Richards

Fluffy-fruit Wood-sorrel

Australian Systematic Botany 7: 175 (1994) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Uncertain

Threat status:Victoria: data deficient (k)

Herb with stems prostrate or decumbent, to 45 cm long, glabrescent to moderately antrorse-hairy, sometimes patent septate hairs also present; taproot poorly developed; bulbils absent. Leaves cauline, 3-foliolate; leaflets subsessile, cuneate-obovate, 3–16 mm long, 5–20 mm wide, bilobed, glaucous, glabrous to pubescent above, often more densely hairy below, margins ciliate, sinus to c. one-third leaflet length, lobes oblong to slightly obovate, apices rounded, 3–6(–10) mm apart; petioles (4–)15–50(–90) cm long, with simple antrorse hairs; stipules conspicuous, 1–3 mm long, apex rounded, ciliate. Inflorescences axillary, flowers 1–4(–6)-flowered, held below, at or a little above leaf level; peduncles mostly shorter than leaves, sparsely antrorse-hairy; pedicels usually deflexed in fruit (but capsules erect). Sepals oblong, 2–4 mm long, often ciliate. Petals (4–)8–12 mm long, yellow. Capsule 5–16 mm long, 1.9–2.5(–3) mm diam., moderate to broad cylindrical, usually densely retrorse-hairy, also longer patent septate hairs present; seeds (1.3–)1.5–1.8 mm long, very compressed, smooth or shallowly ribbed, uniformly coloured, ribs without greyish or whitish lines or blotches. Flowers winter–summer.

EGU, GipP, HNF, HSF, MSB, OtP, WaP, Wim, *VVP. Also SA, Qld, NSW (including Lord Howe Island). New Zealand, New Guinea. A weedy species (but not known from countries beyond the western South Pacific region and so presumed native), mainly from disturbed situations in urban areas with an isolated collection from Neds Corner Station, where growing in lawn at the homestead, but otherwise poorly known and seldom collected in Victoria.

Likely to be more common in Victoria than herbarium collections indicate, but probably overlooked due to confusion with Oxalis corniculata.  Readily distinguished from O. corniculata on account of its antrorsely hairy stems, the capsule indumentum which is a mixture of densely retrorse hairs with longer patent septate hairs (septate hairs very rarely present in Oxalis corniculata), and the smooth and shallowly ribbed seeds.

Source: Conn, B.J.; Jeanes, J.A.; Richards, P.G. (1999). Oxalidaceae. In: Walsh, N.G.; Entwisle, T.J. (eds), Flora of Victoria Vol. 4, Cornaceae to Asteraceae. Inkata Press, Melbourne.
Updated by: Val Stajsic, 2020-03-24
Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Rosanae
order Oxalidales
family Oxalidaceae
genus Oxalis
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <http://avh.chah.org.au>. Find Oxalis thompsoniae in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Oxalis thompsoniae in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Wimmera present uncertain
Victorian Volcanic Plain present introduced
Murray Scroll Belt present uncertain
Gippsland Plain present uncertain
Otway Plain present uncertain
Warrnambool Plain present uncertain
East Gippsland Uplands present uncertain
Highlands-Southern Fall present uncertain
Highlands-Northern Fall present uncertain

State distribution

Distribution map
Western Australia
South Australia
New South Wales
Australian Capital Territory