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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. Aegiphila brenesii , a New Name for the Long-lost (Right Before Our Eyes) Clerodendrum costaricense (Lamiaceae)
    By: Hammel, Barry E - Grayum, Michael Howard,
    Type: Article
    In: Novon: A Journal for Botanical Nomenclature
    Volume: 21
    Issue: 1
    Date: 2011
    Page Range: 44--46
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  2. Bacopa Monnieri (Scrophulariaceae) , a New Record for California
    By: Grayum, Michael Howard, - Wilson, Kenneth A
    Type: Article
    In: Madroño
    Volume: 23
    Date: 1975
    Page Range: 161--161
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  3. Chlorospatha kressii (Araceae), a new compound-leaved species from Chocó Department, Colombia
    By: Grayum, Michael Howard,
    Type: Article
    In: Novon
    Volume: 1
    Date: 1991
    Page Range: 12--14
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  4. The genus Tetranema (Scrophulariaceae) in Costa Rica, with two new species
    By: Grayum, Michael Howard, - Hammel, B
    Type: Article
    In: Phytologia
    Volume: 79
    Date: 1995
    Page Range: 269--280
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  5. Hernandia lychnifera (Hernandiaceae), a new species from coastal Ecuador
    By: Grayum, Michael Howard, - Zamora, N A
    Type: Article
    In: Novon
    Volume: 1
    Date: 1991
    Page Range: 17--20
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  6. Herpetacanthus stenophyllus (Acanthaceae), a new species from Costa Rica
    By: Gómez-Laurito, J - Grayum, Michael Howard,
    Type: Article
    In: Novon
    Volume: 1
    Date: 1991
    Page Range: 15--16
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  7. An Introduction to the Pteridophyte Flora of Finca La Selva, Costa Rica
    By: Grayum, Michael Howard, - Churchill, Hugh W
    Type: Article
    In: American Fern Journal
    Volume: 77
    Date: 1987
    Page Range: 73--89
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  8. Mesoamerican Bactris (Palmae)
    By: De Nevers, Greg - Grayum, Michael Howard,
    Type: Article
    In: Proceedings of the California Academy of Sciences
    Volume: 49
    Series: 4
    Date: 1996
    Page Range: 171--210
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  9. Mollinedia Maxima (Monimiaceae), un nuevo nombre para Mollinedia Macrophylla
    By: Morales,J. Francisco - Grayum, Michael Howard,
    Type: Article
    In: Darwiniana
    Date: 2009-06-01
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  10. New Combinations in Central American Araceae
    By: Croat, Thomas B - Grayum, Michael Howard,
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 74
    Date: 1987
    Page Range: 659--660
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  11. A new species of Geonoma (Arecaceae) from Panama
    By: De Nevers, G C - Grayum, Michael Howard,
    Type: Article
    In: Novon
    Volume: 5
    Date: 1995
    Page Range: 354--356
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  12. New species of Philodendron subgenus Pteromischum (Araceae) from Mesoamerica and Pacific South America
    By: Grayum, Michael Howard,
    Type: Article
    In: Phytologia
    Volume: 73
    Date: 1992
    Page Range: 30--39
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  13. New Taxa of Caladium, Chlorospatha, and Xanthosoma (Araceae: Colocasioideae) from Southern Central America and Northwestern Colombia
    By: Grayum, Michael Howard,
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 73
    Date: 1986
    Page Range: 462--474
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  14. Nomenclatural and taxonomic notes on Costa Rican Araceae
    By: Grayum, Michael Howard,
    Type: Article
    In: Phytologia
    Volume: 82
    Date: 1997
    Page Range: 30--57
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  15. Nomenclatural and taxonomic notes on Costa Rican palms (Arecaceae), with five new species
    By: Grayum, Michael Howard,
    Type: Article
    In: Phytologia
    Volume: 84
    Date: 1998
    Page Range: 307--327
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  16. Notes on Costa Rican Peperomia (Piperaceae), including four new species
    By: Grayum, Michael Howard,
    Type: Article
    In: Phytologia
    Volume: 79
    Date: 1995
    Page Range: 108--113
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  17. On three misunderstood neotropical species of Tectaria (Polypodiaceae: Asplenioideae)
    By: Grayum, Michael Howard,
    Type: Article
    In: Phytologia
    Volume: 64
    Date: 1987
    Page Range: 30--35
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  18. Philodendron subgenus Pteromischum (Araceae) from Saül, French Guiana
    By: Croat, T - Grayum, Michael Howard,
    Type: Article
    In: Novon
    Volume: 4
    Date: 1994
    Page Range: 211--219
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  19. Preliminary Report on the Flora Project of La Selva Field Station, Costa Rica
    By: Hammel, Barry E - Grayum, Michael Howard,
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 69
    Date: 1982
    Page Range: 420--425
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  20. Sedum spathulifolium (Crassulaceae), New to the Santa Monica Mountains, California
    By: Gordon, Thomas R - Grayum, Michael Howard,
    Type: Article
    In: Madroño
    Volume: 23
    Date: 1976
    Page Range: 454--454
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  21. Two New Trifoliolate-Leaved Species of Cucurbitaceae (Cucurbiteae) from Central and South America
    By: Grayum, Michael Howard,
    Type: Article
    In: Novon: A Journal For Botanical Nomenclature
    Volume: 19
    Date: 2009
    Page Range: 465--474
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  22. Validation of a scientific name for the Tahitian lime
    By: Grayum, Michael Howard, - Hammel, B E - Madrigal, Q Jiménez
    Type: Article
    In: Phytoneuron
    Volume: 2012-101
    Date: 2012
    Page Range: 1--5
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