Comparative vegetative anatomy of Wrightia tinctoria R.Br. and the endemic Wrightia indica Ngan (Apocynaceae Juss.) occurring in peninsular India

•The vegetative anatomy of Wrightia tinctoria and Wrightia indica was examined.•Giant stomata were present in leaves of W. tinctoria.•Trichomes were absent in the stem of W. tinctoria but present in W. indica.•Gelatinous fibers present in roots of W. indica were absent in W. tinctoria.•Vegetative anatomy could be valuable in the pharmacognosy of the Wrightia species.