Sorbaria (Ser.) A.Braun

Shrubs, erect to spreading, [2–]10–70 dm, vestiture simple, uniseriate or stellate hairs, often stipitate-glandular; rhizomatous, suckering. Stems 1–10+, widely arching; bark gray; long shoots sparsely branched; glabrous or strongly pubescent and/or stellate, ?axillary buds ovoid to cylindric, bud scales exposed, alternate, glabrous or pubescent or stipitate-stellate?. Leaves deciduous, cauline, alternate, odd-pinnately compound; stipules obliquely adnate to petiole base, linear, lanceolate to ovate, margins entire or serrate, ?hairy ciliate?; petiole present; blade oblong-ovate, 14–35 cm, herbaceous, leaflets (9–)11–19[–25], ?opposite along rachis, sessile?, oblong-ovate to elliptic, margins flat, usually doubly serrate, with 0–6 teeth on each major tooth, surfaces glabrous or hairy. Inflorescences terminal, 15–1100+-flowered, panicles ?becoming pendulous when large?, glabrous or pubescent and glandular; bracts present; bracteoles present. Pedicels present, short. Flowers (5–)7–13(–14) mm diam.; hypanthium shallowly cup-shaped, 1.5–4.6 mm diam., glabrous or stellate-hairy; sepals 5, strongly reflexed, ovate-rounded to oblong-ovate; petals 5, white, ovate to orbicular, ?base short-clawed?; stamens 17–35[–50] usually in 1 series, much exceeding petals, those directly opposite petals sometimes much shorter, ?filaments glabrous?; carpels 5, ?whorled, opposite sepals?, basally and adaxially connate, laterally distinct, glabrous or pubescent, styles adaxial; ovules 4–8. Fruits aggregated follicles, 5, oblong, 3–6 mm, ?leathery, united to hypanthium at base, weakly so on adaxial margins?, glabrous or pubescent, dehiscent along distal adaxial margin, ?adaxial margin often elongating and deflecting style to abaxial edge?; hypanthium persistent; sepals persistent, reflexed, withering; styles not persistent. Seeds 4–8, fusiform, 4 mm. x = 9.