File:Burmannia biflora BrittonBrown.png

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Illustration of Burmannia biflora (northern bluethread) from Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 1: 547.

Illustrations from N.L. Britton & A. Brown (1913): Illustrated Flora of the Northern States and Canada.