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Keywords: Silphium integrifolium-linedrawing.png Silphium integrifolium An illustrated flora of the northern United States Canada and the British Possessions Courtesy of Kentucky Native Plant Society 1913 Nathaniel Lord Britton 1859-1934 and A Brown PD-old-auto-1923 1934 Britton Brown Illustrated flora of the northern states and Canada Silphium integrifolium Silphium - botanical illustrations |