Herbs, perennial, densely tufted to ± matted, ?± aromatic?, 1.5–5(–9) dm, sparsely to densely villous and glandular-pubescent; short-rhizomatous. Stems 1–20+, ascending to erect, ?green, stramineous, or reddish?. Leaves winter-marcescent, primarily basal, ?cauline 2–7, reduced?, alternate, odd-pinnate; stipules persistent, basally adnate to petiole, linear to lanceolate or elliptic, margins entire, cauline sometimes lobed; petiole present; blade narrowly linear in outline, ± cylindric, 4–20(–35) cm, foliaceous, leaflets 30–70, ?separate proximally, otherwise overlapping, sometimes imbricate, terminal confluent with distalmost lateral ones?, broadly obovate to reniform in outline, margins flat, palmately divided nearly to base into linear to oblanceolate lobes, venation palmate. Inflorescences terminal, 5–20-flowered, narrow cymes, ± open or ± congested; bracts present, reduced; bracteoles absent. Pedicels present, ?straight?. Flowers 10–15 mm diam.; epicalyx bractlets 5; hypanthium bluntly campanulate, flat-bottomed, 2–3 × 4–6 mm; sepals 5, reflexed, ?adaxially purple-streaked?, lanceolate to narrowly deltate; petals 5, white, sometimes pink-tinged, narrowly oblong to obovate or spatulate; stamens 20, shorter than petals, ?filaments erect, ± flattened, forming tube, anther thecae dehiscing introrsely?; torus elongate; carpels 25–50, glabrous, styles subterminal, ?slightly rough-thickened basally, otherwise mostly filiform?; ovule 1. Fruits aggregated achenes, individually deciduous, 25–50 or less, obliquely ovoid to reniform, 1–1.5 mm, glabrous; hypanthium persistent; sepals persistent, erect; styles tardily deciduous, ?jointed?.
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