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  1. By: Saar, Dayle E. - Sorensen, Paul Davidsen, - Hjerting, J P
    Type: Article
    In: Acta Botánica Mexicana
    Volume: 64
    Date: 2003
    Page Range: 19--24
    Publication Info: México :Instituto de Ecología, A C.,1988-
  2. By: Hawkes, J G - Hjerting, J P - Tarn, T. R.
    Type: Article
    In: Phytologia.
    Volume: 65
    Issue: 2
    Date: 1988
    Page Range: 114--118
    Publication Info: Bronx Park, New York,H.A. Gleason and H.N. Moldenke,