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Limnophila sessiliflora
http://aquat1.ifas.ufl.edu/seagrant/limses2.html
Images, description, and invasiveness of Asian marshweed.
Limnophila sessiliflora
http://aquat1.ifas.ufl.edu/lisepic.html
Images.
Notes on Limnophila (Scrophulariaceae) of Taiwan
http://ejournal.sinica.edu.tw/bbas/content/1997/4/bot384-11.html
Technical article with descriptions and illustrations of four species.