The flowerhead of Rhynchopsidium pumilum grows solitary on a short peduncle (up to about 2 cm long). The involucre forming the base of the head consists of 5 rows of bracts, oblong in shape and papery-tipped.

Both the short, broadly elliptic rays (female) and the multitude of five-lobed disc florets (bisexual) are yellow. Flowerhead diameter is from 1,7 cm to 2 cm. Flowering happens from late winter to past midspring.

The hairy fruit is slender with a pappus consisting of scales. The generic name, Rhynchopsidium, is derived from the Greek words rhyncho meaning beaked, opsis indicating similarity and idion meaning small, referring to the fruit shape (Vlok and Schutte-Vlok, 2015; Manning, 2009; Le Roux, et al, 2005; iNaturalist).