Well-branched, scrambling shrub up to 2 m tall, young branches greyish-white tomentose, leafy, more distantly so below the inflorescences. Leaves mostly 13-35 x 2-3 mm, scarcely diminishing upwards, linear-lanceolate or linear, apex acute, mucronate, base slightly narrowed, half-clasping, margins strongly revolute, both surfaces greyish tomentose. Heads heterogamous, campanulate, ±4 x 3 mm, many in corymbose clusters corymbose-paniculately arranged. Involucral bracts in 4 series, graded, loosely imbricate, inner about equalling flowers, not radiating, tips very obtuse, opaque white. Receptacle with fimbrils about equalling ovaries. Flowers ±13-20, 4-6 female, 9-15 homogamous. Achenes not seen, ovaries with highly myxogenic duplex hairs. Pappus bristles many, scabrid, bases cohering strongly by patent cilia.
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Like H. revolutum and H. rosum but flower heads oblong-campanulate, involucral bracts oblong and tipped opaque white.