Stem robust, ±1 m tall, nude below, densely leafy above, simple or subsimple, flowering stem white-woolly, closely leafy becoming pedunculoid below the heads. Leaves up to 60(-100) x 30 mm, diminishing in size upwards and becoming distant, elliptic to oblong-elliptic, apex obtuse to subacute, mucronate, base broad, half-clasping, upper surface thinly white-woolly, lower densely so, 3-nerved. Heads homogamous or occasionally heterogamous, campanulate, ±11 x 20 mm across the radiating bracts, many in a compact corymbose panicle up to 110 mm across. Involucral bracts in ±10 series, graded, loosely imbricate, inner much exceeding flowers, radiating, acute to subobtuse, dull, snow-white. Receptacle nearly smooth. Flowers 50-78, occasionally 1 female. Achenes 1.5 mm long, barrel-shaped, ribbed, with duplex hairs, not myxogenic. Pappus bristles many, tips subplumose, bases cohering strongly by patent cilia.
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Like H. grandiflorum but leaves thinly woolly above, flower heads larger, ± 11 x 20 mm in a spreading corymb and involucral bracts much exceeding florets.
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