Notothlaspi rosulatum has a flat rosette of grey leaves, up to 3 in (8 cm) across. Above the leaves a conical flowerhead of white flowers is seen in summer. After flowering it dies.
Notothlaspi rosulatum is called the penwiper plant, as it resembles an old-fashioned cloth penwiper. It is found in the drier subalpine to high alpine areas of the South Island of New Zealand, from Marlborough southwards to North Otago.