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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Ownbey, Gerald B., - Hsi, Yu-Tseng
    Type: Article
    In: Rhodora
    Volume: 65
    Date: 1963
    Page Range: 339--354
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Ownbey, Gerald B., - Hsi, Yu-Tseng
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 20
    Date: 1969
    Page Range: 225--228
    Publication Info: Berkeley, California Botanical Society,