Shahryar Saeidi-Mehrvarz - Department of Biology, Faculty of Sciences, University of Guilan, Rasht, Iran.

Following examination by light microscope of the stem and leaf features of species of Odontites from Iran; anatomical study revealed that these taxa can be separated on the basis of leaf features. A key distinguishing these taxa is provided. O. glutinosa differs from other studied species in having isobilateral cross section.

Odontites, leaf, Anatomy, Systematic, Iran