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1c. Aruncus dioicus (Walter) Fernald var. acuminatus (Rydberg) H. Hara, J. Jap. Bot. 30: 68. 1955.
Aruncus acuminatus Rydberg in N. L. Britton et al., N. Amer. Fl. 22: 255. 1908
Leaf surfaces mostly glabrous. Styles 0.3–0.5 mm. Follicles slender, 2.5–5 mm. Seeds 1.8–2.5 mm. 2n = 18.
Flowering early summer. Moist to wet ravines, rocky ledges, avalanche tracks, stream banks, forest edges and openings; 0–4800 m; Alta., B.C., Yukon; Alaska, Calif., Oreg., Wash.
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