Oxalis exilis A.Cunn.

Shade Wood-sorrel

Ann. Nat. Hist. 3: 316 (1839) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Herb with stems creeping or ascending, often rooting at nodes, to 35 cm long, very sparsely antrorse-hairy; taproot absent or poorly developed,  rarely stout; bulbils absent. Leaves cauline, tufted, 3-foliolate; leaflets sessile, cuneate-obcordate, (2.5–)3.5–6(–13) mm long, 3–10(–16) mm wide, bilobed, usually green, more or less glabrous above, pubescent below, margins ciliate, sinus to c. one-third leaflet length, lobes obovate, divergent, apices obtuse, 2–3 mm apart; petioles 1–9 cm long, with antrorse hairs; stipules to c. 2 mm long, conspicuous, with apex lobed or truncate, or inconspicuous with apex tapering abruptly to pedicel, ciliate. Inflorescences axillary, flowers 1- or rarely 2 per peduncle, held more or less at leaf level, or slightly above; peduncles at least as long as leaves, antrorse-hairy; pedicels erect or deflexed in fruit (but capsule erect). Sepals oblong, 1.5–3 mm long, often ciliate; petals 4.5–10 mm long, yellow. Capsule (5–)6–8(–13) mm long, 2–3 mm diam., ovoid to conical to broad cylindrical, usually moderately retrorse-hairy, sometimes with longer, scattered, patent, septate hairs, seldom glabrescent or glabrous; seeds (1.0–)1.2–1.8 mm long, transversely ribbed, ribs (4–)6–10(–13), narrow, grooves  V-shaped, narrow and deep, uniformly coloured, brown to dark brown, ribs without greyish or whitish lines or blotches, except in the variant from disturbed sites. Flowers mainly Oct.–May.

Brid, CVU, DunT, EGL, EGU, GipP, Glep, Gold, GGr, HFE, HNF, HSF, MonT, MuF, MuM, NIS, OtP, OtR, SnM, Strz, VAlp, VRiv, VVP, WaP, WPro, Wim. Also NSW, Tas., Norfolk Island. New Caledonia, New Zealand. Naturalised in United Kingdom. Widespread throughout much of the State, often in winter-wet depressions or along stream banks on a wide range of soils. Occasionally a garden weed, sometimes densely mat-forming in lawns.

A variable species with plants from more mesic habitats often much more robust and with larger leaflets than those from drier inland areas but, generally, leaves of this species are the smallest of the Oxalis corniculata complex. Oxalis exilis generally also has smaller flowers and capsules than other members in the O. corniculata complex. Another variant occurs often in lawns and disturbed habitats, and has not been found growing in indigenous vegetation. This variant of O. exilis is poorly represented in herbarium collections. The variant is long rhizomatous. It differs from other forms of O. exilis in having whitish lines and or blotches on the seed ridges, a character shared with a form of O. corniculata (that is currently known only from garden beds urban Melbourne), with which it can be confused. This variant of O. exilis also has the smallest leaves and flowers among the forms of O. exilis, and may represent another taxon, and is possibly non-indigenous. The variant also occurs in New Zealand, and apparently the United Kingdom. O. exilis can be recognised by its usually long creeping stems, which are very sparsely antrorsely hairy, the usually 1- or occasionally 2-flowered inflorescence, the inflorescence which is usually held more or less at leaf level or slightly above, and the relatively short capsules. Large-flowered forms of O. exilis can be confused with O. rubens, but it differs from O. rubens in having shorter capsules compared with the relatively long capsules in O. rubens, and the seeds have V-shaped rather than U-shaped grooves, and the leaves are usually green in O. exilis rather than glaucous or grey green as in O. rubens. The two species also have different habitat preferences, with O. rubens confined to coastal dunes and scrub. The relationship between O. exilis and O. perennans also warrants investigation.

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, 2018-07-24
Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Rosanae
order Oxalidales
family Oxalidaceae
genus Oxalis
Higher taxa

Victoria

Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <http://avh.chah.org.au>. Find Oxalis exilis in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Oxalis exilis in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Murray Mallee present native
Wimmera present native
Glenelg Plain present native
Bridgewater present native
Victorian Volcanic Plain present native
Victorian Riverina present native
Murray Fans present native
Gippsland Plain present native
Otway Plain present native
Warrnambool Plain present native
Goldfields present native
Central Victorian Uplands present native
Greater Grampians present native
Dundas Tablelands present native
Northern Inland Slopes present native
East Gippsland Lowlands present native
East Gippsland Uplands present native
Wilsons Promontory present native
Highlands-Southern Fall present native
Highlands-Northern Fall present native
Otway Ranges present native
Strzelecki Ranges present native
Monaro Tablelands present native
Highlands-Far East present native
Victorian Alps present native
Snowy Mountains present native

State distribution

Distribution map
State
Western Australia
Northern Territory
South Australia
Queensland
New South Wales
Australian Capital Territory
Victoria
Tasmania