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- Alnus incana subsp. tenuifolia (category Alnus incana)Basionym: Alnus tenuifolia Nuttall N. Amer. Sylv. 1: 48. 1842 Synonyms: Alnus incana var. occidentalis (Dippel) C. L. Hitchcock Alnus incana var. virescens S4 KB (357 words) - 22:48, 5 November 2020