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by Li, Nan; Stevenson, Dennis Wm.; Griffith, M. Patrick
by Cutler, David F.; Botha, Ted; Stevenson, Dennis Wm.
by Stevenson, Dennis Wm.; Osborne, Roy; Blake, Alberto Sidney Taylor
by David F. Cutler (Royal Botanic Gardens, Kew); Ted Botha (Rhodes University, Grahamstown, South Africa); Dennis Wm. Stevenson (New York Botanical Garden)