Euryops tenuissimus, in Afrikaans commonly known as the grootharpuisbos (large resin bush), is an erect, willowy shrub reaching heights up to 2,5 m.
The flowerheads are solitary, forming flat-topped clusters on wiry peduncles among or just above the leaves. Flowerheads have one whorl of yellow or orange ray florets around a small, dense cluster of yellow disc florets. A flowerhead becomes up to 1 cm in diameter.
Flowering happens from late winter to mid-spring. The fruits are hairy, becoming sticky or slimy when wet; the seeds small and hairy.
The distribution is from Namaqualand to the southern Cape. The plants grow on semi-arid, sandstone slopes. The plant is not considered to be threatened in its habitat early in the twenty first century (Manning, 2007; www.redlist.sanbi.org).