Branched, biennial herb or shrub, up to 2 m high. Stems woody, pubescent, closely leafy. Leaves linear to linear-lanceolate, up to 150 x 3 mm, margins revolute, smooth or denticulate, both sides ± glabrous or ± roughly hairy. Inflorescence corymbose. Capitula few-many, discoid, buff-coloured or pale yellow; involucre campanulate; bracts ± 20, 8-11 mm long; calyculus bracts many. Flowering time Sept., Oct. Cypselae cylindrical, 2.5 mm long, ribbed, glabrous.
Like S. paniculatus but leaves mostly filiform and flower heads fewer and larger, bright yellow.