The current study uses Stereo and SEM microscopy, to present an accurate morphological description of the seeds of eight Ruellia species in the Kingdom of Saudi Arabia. Diagnostic features such as seed shape, dimensions, color, epidermal cells, and seed coat surface were studied. The ripe seeds showed some morphological differences; the seed shape was confined between orbicular disc shapes in R. malacosperma, R.sp.sh2010, R. patula, R. tweediana. (violat, white) and the oval shape in R. brittoniana, R. sp. Taif.rose, and the renal shape in R. carolinensis. The seed's color ranged from brown to dark brown, R. brittoniana and R. tweediana.-rose were distinguished with dark brown edges. The decoration on the outer seed coat (the stalk) is reticulate in two species, R. patula and R.sp.sh2010, with long, dense cylindrical hairs with annular long cylindrical rings at the edges of the seed, while the decoration was not evident in the rest of the species due to the presence of a dense layer of hairs.