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F.  Luebert, Brokamp, G., Wen, J., Weigend, M., and Hilger, H. H., ?Phylogenetic relationships and morphological diversity in Neotropical Heliotropium (Heliotropiaceae)?, Taxon, vol. 60, no. 3, pp. 663-680, 2011.

M.  Rex, Schulte, K., Zizka, G., Peters, J., Vásquez, R., Ibisch, P. L., and Weising, K., ?Phylogenetic analysis of Fosterella L.B. Sm. (Pitcairnioideae, Bromeliaceae) based on four chloroplast DNA regions?, Molecular Phylogenetics and Evolution, vol. 51, pp. 472?485, 2009.

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M.  Rex, Patzolt, K., Schulte, K., Zizka, G., Vásquez, R., Ibisch, P. L., and Weising, K., ?AFLP analysis of genetic relationships in the genus Fosterella L.B. Smith (Pitcairnioideae, Bromeliaceae)?, Genome, vol. 50, pp. 90?105, 2007.

F.  Luebert, Weigend, M., and Hilger, H. H., ?Epitypification of Heliotropium arborescens L. (Heliotropiaceae)?, Taxon, vol. 59, pp. 1263-1266, 2010.

F.  Luebert and Wen, J., ?Phylogenetic analysis and evolutionary diversification of Heliotropium sect. Cochranea (Heliotropiaceae) in the Atacama Desert?, Systematic Botany, vol. 33, no. 2, pp. 390-402, 2008.

F.  Luebert, Wen, J., and Dillon, M. O., ?Systematic placement and biogeographical relationships of the monotypic genera Gypothamnium and Oxyphyllum (Asteraceae: Mutisioideae) from the Atacama Desert?, Botanical Journal of the Linnean Society, vol. 159, pp. 32-51, 2009.