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By: Gress, Ernest MiltonType: ArticleIn: Annals of the Carnegie MuseumVolume: 13Series:Issue: 3-4Date: 1922-03Page Range: 274--332Publication Info: [Pittsburgh], Published by authority of the Board of Trustees of the Carnegie Institute, 1901-Subjects:
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By: Gress, Ernest MiltonType: ArticleIn: RhodoraVolume: 25Series:Issue:Date: 1923Page Range: 12--13Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],Subjects: