Bibliography and Citations

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Anderson L.C, Kyhos D.W, T. Powell MA.M, Powell A.M, Raven P.H.  1974.  Chromosome numbers in Compositae. IX. Haplopappus and other Astereae.  American Journal of Botany.  61(6):665-671.
Powell A.M, Kyhos D.W, Raven P.H.  1975.  Chromosome numbers in Compositae. XI. Helenieae.  American Journal of Botany.  62(10):1100-1103.