Tribulus minutus Leichh. ex Benth.

Caltrop

Fl. Austral. 1: 291 (1863) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Threat status:Victoria: data deficient (k)

Prostrate much-branched annual or perennial herb; stems to 60 cm long, covered with short appressed hairs, glabrescent with age. Leaves opposite, unequal, sometimes 1 falling and then appearing alternate, with 3–7 pairs of leaflets; leaflets subsessile, obliquely oblong, 3–8 mm long, to c. 2.5 mm wide, apex acute or obtuse, upper surface with hairs mostly on midrib and margins, lower surface more evenly hairy; stipules more or less triangular, to c. 1 mm long. Flowers on pedicels to c. 10 mm long; sepals ovate, 1.5–3 mm long, acute; petals obovate, 3–5 mm long, yellow; stigma hemispherical to globose, style much shorter than stigma, often nearly absent. Schizocarp more or less globose, glabrous or with sparse broad-based bristles; mericarps pyramidal, 2–5 mm long, rugose-muricate on dorsal surface, with 2 divergent spines 0.5–2 mm long below middle and 2 very short downward pointing spines near base; seeds 1 or 2 per mericarp. Flowers mostly Nov.–Apr.

MuM. Also WA, NT, SA, Qld, NSW. Currently known in Victoria only by a few roadside collections from Irymple near Mildura.

The collecting notes on the three Victorian specimens indicate that the populations in Victoria are perennial, in constrast to the annual Tribulus terrrestris. R. F. Parsons cited in Barker (1998) remarked on the fact that Victorian plants are obviously perennial on account of the massive woody rootstocks.

Source: Jeanes, J.A. (1999). Zygophyllaceae. In: Walsh, N.G.; Entwisle, T.J. (eds), Flora of Victoria Vol. 4, Cornaceae to Asteraceae. Inkata Press, Melbourne.
Updated by: Val Stajsic, 2018-05-11
 
References

Barker, R.M. (1998). A trial key and notes on Tribulus (Zygophyllaceae) in Australia, including one new species and validation of Tribulus suberosus, Nuytsia 12(1): 9-35.

Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Rosanae
genus Tribulus
Higher taxa

Victoria

Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <http://avh.chah.org.au>. Find Tribulus minutus in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Tribulus minutus in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Murray Mallee present native

State distribution

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