Notothlaspi australe is a small plant, with radiating leaves from a central stem. The leaves have a small pointed tip, and are green to brown. They are "3.0–6.5 mm wide, ovate to broadly ovate and with 1–6 teeth". The form is prostrate.[5]
The flowers are small and white, with a single flower forming from the axil of the uppermost stem. Young plants may form a single rosette, but with time these will branch out to form multiple, matted rosettes.[5]
Notothlaspi australe is known exclusively on to the northern mountain ranges of the South Island of New Zealand,[5] where it is present in alpine and subalpine habitats.[6]Notothlaspi australe does not tend to live on the subranges that are composed of ultramafic rock like Maungakura / Red Hill, where the newly described Notothlaspi viretum dominates instead.[5]
Notothlaspi australe is considered Not Threatened, but it has two qualifiers attached, DPS and DPT, both of which indicate that more data is needed for this species.[11]
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