Wiry perennial herb, roots fibrous, stems slender, soft-wooded, decumbent or ascending, up to 500 mm long, simple below, sparingly branched above, greyish-white woolly, densely leafy. Leaves up to 40 x 25 mm, smaller and more distant upwards, oblong or elliptic, apex acute, mucronate, base broad, clasping, both surfaces greyish-white woolly. Heads homogamous, campanulate, ±5-7 mm long, double that across the radiating bracts, up to ±12 in a dense terminal corymbose cluster. Involucral bracts in ±9 series, loosely imbricate, much exceeding flowers, acute, glossy, white, mostly tipped dark brown or purplish brown outside, rarely whole bract dull purple. Receptacle smooth or shortly honeycombed. Flowers 26-64, yellow. Achenes ±1 mm, with duplex hairs. Pappus bristles many, scabrid, tips barbellate, white or purplish, bases cohering by patent cilia.
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Like H. crispum but leaves oblong with broad, clasping base and flower heads somewhat larger, ± 5-7 x 10-14 mm.