Angiosperm Phylogeny Website, botanical information system at the Missouri Botanical Garden, available at http://www.mobot.org/MOBOT/research/APweb/
Hilger, Hartmut H., and Nadja Diane
A systematic analysis of Heliotropiaceae (Boraginales) based on trnL and ITS1 sequence data
Journal/Book Name, Vol. No.:
Botanische Jahrbücher für Systematik, vol. 125, no. 1
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