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  1. Manual de plantas de Costa Rica /B.E. Hammel ... [et al.] editores ; Silvia Troyo, ilustraciones.
    By: Grayum, Michael Howard, - Hammel, Barry Edward, - Herrera, Cecilia. - Zamora Villalobos, Nelson.
    Publication info: St. Louis, Mo. :Missouri Botanical Garden,2003-
    Contributed by: Missouri Botanical Garden, Peter H. Raven Library
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  1. Cyathea stolzei x ursina, a distinctive tree fern hybrid from Costa Rica
    By: Smith, Alan R - Grayum, Michael Howard, 1949-
    Type: Article
    In: American Fern Journal
    Volume: v. 78, no. 3, p. 105-108
    Date: 1988
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  2. The genus Tetranema (Scrophulariaceae) in Costa Rica, with two new species
    By: Grayum, Michael Howard, 1949- - Hammel, B
    Type: Article
    In: Phytologia
    Volume: 79
    Date: 1995
    Page Range: 269--280
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  3. Mesoamerican Bactris (Palmae)
    By: De Nevers, Greg - Grayum, Michael Howard, 1949-
    Type: Article
    In: Proceedings of the California Academy of Sciences
    Volume: 49
    Series: 4
    Date: 1996
    Page Range: 171--210
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  4. Mollinedia Maxima (Monimiaceae), un nuevo nombre para Mollinedia Macrophylla
    By: Morales,J. Francisco - Grayum, Michael Howard, 1949-
    Type: Article
    In: Darwiniana
    Date: 2009-06-01
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  5. A new combination in Gordonia Theaceae
    By: Grayum, Michael Howard, 1949- - Jiménez-Madrigal, Quirico
    Type: Article
    In: Phytoneuron
    Volume: v. 2011-10, p. 1-3
    Date: 2011
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  6. Relationships among time, frequency, and duration of flowering in tropical rain forest trees
    By: Bawa, Kamaljit S - Kang, H.S - Grayum, Michael Howard, 1949-
    Type: Article
    In: American Journal of Botany
    Volume: v. 90, no. 6, p. 877-887
    Date: 2003
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