Annual, with several erect stems from base, 15-150 mm tall. Leaves linear-filiform, occasionally twisted, upper surface white-tomentose, margins rolled in. Flowerheads disciform, few together in leaf axils; involucral bracts acuminate, golden-brown or whitish, occasionally tinged red, glabrous; outer female florets filiform, 18-23; bisexual florets 3-6, with sterile ovaries. Cypselas of female florets obovate, triangular, minutely hairy; pappus in female florets absent, in bisexual florets of bristles with scabrid or nude shaft and plumose tips, occasionally absent.
Like I. glomerata but ovaries of hermaphrodite flowers aborted.