T h e goal o f th is stu d y is to d e te rm in e th e o u ter a n d in n er m orphological c h a ra c te ris tic s o f n ativ e elm tax a. T h e stu d ies hav e c a rrie d o u t on m ate ria ls ta k e n fro m th e ir n a tu ra l grovving places. Som e new in v en tio n s vvere ad d ed o n to k n o w n c h a ra c te ristic s in th e o u te r m o rp h o lo g ical a n d an ato m ic stru c tu - re. A fte r th is, th e defm itio n keys w ere p re p a re d u sin g these ch ara cte ristics.