Physocarpus opulifolius (L.) Maxim.
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Rosaceae
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Scientific Name
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Description
Species Description - Shrub to 3 m, the bark exfoliating in narrow strips; petioles 1–3 cm; lvs ovate to obovate, the principal ones ± 3-lobed, irregularly serrate, broadly cuneate to truncate at base; pedicels 1–2 cm; sep 1.5–2.5 mm; fls 7–10 mm wide; fr 5–10 mm, glabrous or stellate-pubescent; 2n=18. Moist, sandy or rocky soil, especially along streambanks and shores; Que. to N.D. and Colo., s. to N.C., Tenn., and Ark., also escaped from cult. May–July. The form with stellate fr, commoner toward the west, has been called var. intermedius (Rydb.) B. L. Rob. (Opulaster opulifolius; O. australis)