Shrubs, erect to widely spreading, 6–20 dm, ?herbage strongly aromatic?. Stems 1–10+, ascending-spreading, ?strongly branched from base and above?; bark russet, with age gray, ?smooth?; long shoots present; strongly stipitate-glandular, stipitate-stellate, hirtellous, sometimes strongly glutinous. Leaves persistent, cauline, alternate, 1(–2)-pinnate-pinnatifid; stipules free, subulate to oblanceolate, margins entire; petiole present; blade oblong-ovate, 2.6–7(–9.6) cm, herbaceous, pinnae 13–25 per side, ?ascending, opposite to alternate on rachises?, narrow, deeply divided into obovate segments, each segment decurrent on rachilla on proximal base, margins entire or secondarily toothed-lobed, surfaces glabrous or stellate-hairy, glandular. Inflorescences terminal ?on long shoots of season?, 20–400-flowered, panicles ?narrowly ovoid, lateral branches leafy at bases?; bracts present, ?proximal bracts of reduced leaves, distal bracts lanceolate, pinnate-lacerate, or entire?; bracteoles present. Pedicels present. Flowers 10–13 mm diam.; hypanthium funnelform, to 3–4 mm diam.; sepals 5, spreading, ovate-deltate; petals 5, white, orbiculate-reniform, ?base short-clawed?; stamens 70–110 in 2 or 3 series, shorter than petals; carpels (4 or)5, distinct, appearing connivent at base, sericeous, styles ?caducous?, terminal, ?slender?, ?stigmas broadened?; ovules 10–12 in 2 series. Fruits aggregations of (4–)5 follicles, each obliquely lanceoloid, 3–5 mm, hirtellous, dehiscent to bases on ventral sutures and halfway along dorsal sutures; hypanthium persistent; sepals persistent, erect to spreading; styles persistent or not. Seeds 3–8, narrowly fusiform, thin walled. x = 9.
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