Stylidium adnatum (the beaked triggerplant) is a dicotyledonous plant that belongs to the genus Stylidium (family Stylidiaceae). S. adnatum is endemic to Australia and is found primarily in the southwest region of Western Australia.
This species is leafy-stemmed and scrambling, growing up to 10 cm tall with leaves to 3 cm long and 5 mm wide. It blooms in late winter and spring with small (3–4 mm wide), white flowers that bear red stripes. S. adnatum is primarily found in jarrah and karri forests, among reeds of paperbark swamps, and in heath by streams entering the ocean. Stylidium adnatum var. abbreviatum (Benth., 1868) is a variety of this species found in wild populations and is noted for its short and dense inflorescence. The variety was discovered and named twice, the second being S. adnatum var. propinquum (R.Br.), though this name is no longer used.