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  1. The Clematis fremontii Var. Riehlii Population in the Ozarks
    By: Erickson, Ralph O
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 32
    Date: 1945
    Page Range: 413--460
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  2. Dolomitic Glades of East-Central Missouri
    By: Erickson, Ralph O - Brenner, Louis G - Wraight, Joseph
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 29
    Date: 1942
    Page Range: 89--101
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  3. Mass Collections: Camassia Scilloides
    By: Erickson, Ralph O
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 28
    Date: 1941
    Page Range: 293--298
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  4. Population Size and Geographical Distribution of Clematis Fremontii Var. Riehlii
    By: Erickson, Ralph O
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 30
    Date: 1943
    Page Range: 63--68
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  5. Taxonomy of Clematis Section Viorna
    By: Erickson, Ralph O
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 30
    Date: 1943
    Page Range: 1--62
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