On the systematic position of Euphrasia marchesettii Wettst. B. marchesettiiWettst. is generally considered as a hybrid betweenE. kerneriWettst. and a not well mentioned species of subsect.Angustifoliae. Some ecological and phenological observations rouse a doubt on this interpretation and suggest the hypotesis thatE. marchesettiimay have a common origin withE. kerneri. Its differentiation could be possibly due to specialization in wet communities. A morphometric study was carried out to compareE. marchesettiiwith its possible ancestors out of subsect.CiliataeandAngustifoliae. The results of this study show that the highest morfological affinity ofE. marchesettiiis withE. kerneri; consequently it should be included in subsect.Ciliatae.