Schrire BD, Lavin M, Barker NP, Forest F (2009). "Phylogeny of the tribe Indigofereae (Leguminosae-Papilionoideae): Geographically structured more in succulent-rich and temperate settings than in grass-rich environments". Am J Bot. 96 (4): 816–52. doi:10.3732/ajb.0800185. PMID21628237.
ildis.org
"ILDIS LegumeWeb entry for Rhynchotropis". International Legume Database & Information Service. Cardiff School of Computer Science & Informatics. Retrieved 12 February 2017.
Schrire BD, Lavin M, Barker NP, Forest F (2009). "Phylogeny of the tribe Indigofereae (Leguminosae-Papilionoideae): Geographically structured more in succulent-rich and temperate settings than in grass-rich environments". Am J Bot. 96 (4): 816–52. doi:10.3732/ajb.0800185. PMID21628237.