The paper presents results of research on seed sculpture of <em>Plantago major</em>, <em>P. intermedia</em>, <em>P. media</em>, <em>P. coronopus </em>subsp. <em>coronopus</em>, <em>P. maritima </em>subsp. <em>maritima</em>, <em>P. atrata </em>subsp. <em>carpatica</em>, <em>P. lanceolata</em> and <em>P. arenaria</em>. Special attention was paid to the sculpture of the external layer of the testa. Observations were made under a light microscope and a scanning electron microscope. The sculpture typical for each species was presented in micrographs. The results indicate that seed sculpture is a very good interspecific identification feature. The study also confirmed that <em>P. maritima </em>should not be assigned to the section <em>Coronopus </em>DC., but to a separate section <em>Maritima </em>Rahn.