 After "S. graminifolium" was discovered and formally described, new forms and varieties were added to what came to be known as the "Stylidium graminifolium" complex, a group of plants that has been treated as a single species but may have significant morphological differences that require the complex to be split into new species.The complex was formally split into three species in 2001, with "S. graminifolium" lectotypified from the collections of Banks and Solander in the 1770s."S.