The silvery, nearly globose Serruria cygnea flowerheads grow solitary from leaf axils. They are about 2 cm in diameter, on hairless peduncles of 2 cm to 5 cm. The sweetly fragrant head comprises about twelve to twenty florets. The pink to brown perianth buds have silvery white tips that curve in, resembling swan necks to some, or to observers in a certain state. There are papery involucral bracts subtending the flowerheads, often with reddish or bronze tints.
The specific name, cygnea, is derived from the Latin word cygnus or cycnus meaning swan, and cygnea meaning swan-like, referring to the floret bud shape.
The plants are pollinated by insects.
Bloomtime is spring (Rebelo, 1995; Bond and Goldblatt, 1984; iNaturalist; JSTOR; Wikipedia).