Seed morphology of Perilla frutescens: Nutlets are broadly obovate, slightly flat, with brownish gray, yellowish brown or dark brown surface, and slightly prominent reticulate patterns observed under dissecting microscope; There is a prominent white or light brown navel at the base, and the peel is about 0.2 mm thick, containing 1 seed.

The seeds are broadly obovate or round with white or light brown surface, white, light brown or brown seed ridges on the ventral surface, and the seed coat is transparent and membranous. The embryo is straight, white, oily, short radicle, 2 cotyledons, plump, round or broadly obovate, and the base is heart-shaped. 1000-grain weight1.2g.