Macro-Microscopic Identification of Dried Flowers of Hibiscus rosa-sinensis L. and its Differentiation from Adulterant Rhododendron arboreum Sm., Govindarajan, Nartunai, Sundharamoorthy Susikumar, Kannan Narayanan, and Raju Ilavarasan , Pharmacognosy Journal, May 2019, Volume 11, Issue 3, p.613-616, (2019)