Perennial; stems numerous, 15–35 cm, subglabrous or sparsely strigose to occasionally densely spreading-villous; lvs thin, lax, subglabrous, all about alike except for the reduced and scale-like lowest ones, linear or nearly so, to 3 cm × 5 mm, often with short leafy axillary shoots; heads 1–5, on conspicuous, long, subnaked peduncles to which the cauline lvs are abruptly reduced; disk 6–12 mm wide; invol 4–6 mm; rays 20–50, white or sometimes pink or rose-purple, 4–8 mm; pappus obscurely double; 2n=18. Mostly on rocky shores and banks; n. Vt. to Me., se. Can., and n. Mack. Summer. Ours is var. hyssopifolius.
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