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Key to Aruncus

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1 Follicles 2.5-3.5 mm long
1 Follicles 1.5-2 mm long.
  2 Follicles semi-ovoid, strongly convex on the back, about 1/2 as thick (measured radially) as long, 1.5-2.0 mm long; leaves somewhat lustrous, the lower surface glabrous to sparsely pubescent
  2 Follicles nearly cylindric, about 1/3 as thick (measured radially) as long, 1.7-2.5 mm long; leaves dull, the lower surface pubescent