Tricarpellary, syncarpous gynoecium is found in flowers of: Liliaceae, Solanaceae, Fabaceae, Poaceae

The correct option is A Liliaceae. According to the number of carpels, the gynoecium is monocarpellary, bicarpellary, tricarpellary, and multicarpellary. An ovary with united carpels is called a syncarpous ovary, while that with distinct carpels is the apocarpous ovary. Solanaceae has a bicarpellary, syncarpous, bilocular or tetralocular gynoecium with a superior and obliquely placed ovary. Option B is incorrect. Liliaceae has a tricarpellary, syncarpous, trilocular gynoecium, which makes option A correct. Option C is incorrect as Fabaceae has a unicarpellary gynoecium. Option D is incorrect as Poaceae has a monocarpellary ovary.