Goyder & Nicholas (Hiern) 2001 - Goyder DJ, Nicholas A (2001) A Revision of Gomphocarpus R. Br. (Apocynaceae: Asclepiadeae). Kew Bulletin 56(4): 769-836. doi: 10.2307/4119297.
There is no corrections for Gomphocarpus tomentosus subsp. frederici yet.