What is the origin of the species epithet "bonariensis"? Several species have this name; i.e., Hydrocotyle bonariensis. (I seem to be unable to type that in italics.)
According to Stearn's Dictionary of Plant Names, it means "of Buenos Aires, Argentina". To get italics or bold, swipe your text and use the the text editing functions in the text box (all the little icons at the top of the text box.) If you don't see those icons when you enter your message, go to My Settings (first item on the green bar at the top of the page, then in Settings & Options, choose Edit Options, then scroll down to Miscellaneous Options and and choose the Standard Editor from the drop down list.