All the seagrasses have horizontal rhizomes, and many species have vertical rhizomes.In some seagrass species, clonal reproduction, via apomict, was also observed.

• 所有的海草都具有水平根状茎，许多海草也具有垂直根状茎，在一些海草中，也观察到无性生殖(无融合生殖)。