References
For Hedera
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Graham, S.A. 1966. The genera of Araliaceae in the southeastern United States. J. Arnold Arb. 47: 126-136. Google Scholar
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Wen, J. 2024f. Hedera. In Flora of North America Editorial Committee. 2024. Flora of North America north of Mexico. Volume 13, Magnoliophyta: Geraniaceae to Apiaceae. Oxford Univ. Press, New York, NY. 566 pp. Google Scholar