Wasshausen & Wood. 2004: Contr. U.S. Natl. Herb. 49:1-152. Fig. 42, "Acanthaceae of Bolivia"; Brittonia 54: 296. 2003; Flora of the Guianas Series A: Phanerogams, Fascicle 23: 156 Acanthaceae, 159 Mendonciaceae. 2006. Fig. 32
Wasshausen, Dieter C. and J.R.I. Wood
Figure A. Thunbergia alata (Acanthaceae). Collection: Lau & Cory 2475, US, Bolivia, A. habit. - 1999.
Figure B-E. Thunbergia alata (Acanthaceae). Collection: D. Wasshausen & Encarnacion 1709, US, Peru, B. bracteoles, C. calyx, D. corolla, E. corolla expanded. - 1999.