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journalAt: Torreya, 2, 5 By: Knowlton F. H.
journalAt: Botanical Gazette, 13, 6 By: Knowlton F. H.
journalAt: Torreya, 7, 9 By: Cockerell T. D. A.
journalAt: American Journal of Science, Series 3, 37, 219 By: Knowlton F. H.
journalAt: Bulletin of the Torrey Botanical Club, 13, 5 By: Newberry J. S.
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