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Credit: Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 1: 174. | USDA | License: PD USDA

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Credit: User:Kilom691 | Original book source: Prof. Dr. Otto Wilhelm Thomé Flora von Deutschland, Österreich und der Schweiz 1885, Gera, GermanySource: www.biolib.de | License: CC-BY-SA-3.0-migrated GFDL PD Old

Credit: Forest & Kim Sta... | Plants of Hawaii, Image 041018-0044 from http://www.hear.org/... | License: PD USGS

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Credit: User:Kilom691 | Original book source: Prof. Dr. Otto Wilhelm Thomé Flora von Deutschland, Österreich und der Schweiz 1885, Gera, GermanyPermission granted to use under GFDL by Kurt StueberSource: www.biolib.de | License: CC-BY-SA-3.0-migrated GFDL PD Old

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Credit: USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 3: 211. | USDA | License: PD USDA