Hitchcock, C.L.; Cronquist, A. 1973. Flora of the Pacific Northwest. Part 5: Compositae. Seattle, WA: University of Washington Publications in Biology, Volume 17. University of Washington Press. 750 p.

Hitchcock, C.L.; Cronquist, A. 1973. Flora of the Pacific Northwest. Part 5: Compositae. Seattle, WA: University of Washington Publications in Biology, Volume 17. University of Washington Press. 750 p.

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