H.E. Ballard Jr. (Harvey)
Articles
Ballard Jr., H.E., Wetter, M.A. & Zamora, N., 1997. Two new species of Hybanthus (Violaceae) from Central America and a regional key for the genus. Novon 7: 221-226.
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Munzinger, J.K. & Ballard Jr., H.E., 2003. Hekkingia (Violaceae), a New Arborescent Violet Genus from French Guiana, with a Key to Genera in the Family. Systematic Botany 28 (2), Apr-Jun 2003: 345-351. ≡
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