Accepted By:
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Kårehed, J. & B. Bremer. 2007. The systematics of Knoxieae (Rubiaceae)-molecular data and their taxonomic consequences. Taxon 56(4): 1051-1076.
General:
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Jansen, S., E. Robbrecht, H. Beeckman & E. Smets. 2000. Aluminum accumulation in Rubiaceae: an additional character for the delimitation of the subfamily Rubioideae?. IAWA J. 21(2): 197–212.
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