Oedera squarrosa ("Vierkant-perdekaroo") is a prickly shrublet belonging to the family Asteraceae.

It is an abundant and common species in the southwestern Cape Provinces of South Africa (Namaqualand to Port Elizabeth).

It is most commonly found in close proximity to the main mountain ranges, especially in rocky loamy or clayey soils.

The leaves are small (15mm x 7mm), ovate, glandular and down-curved, with thickened margins, and grow densely packed along the stems.

Tufts of a couple of yellow flowerheads appear at the tips of the branches in Spring and Summer.