Stylidium alsinoides is a dicotyledonous plant that belongs to the family Stylidiaceae.

Obovate or elliptical leaves, about 20–100 per plant, are scattered along the elongate, glabrous stems.

Inflorescences are 5–15 cm (2.0–5.9 in) long and produce white flowers that bloom from April to September in Australia but occur year-round in Malesia.

S. alsinoides's distribution ranges from northern Queensland in Australia north to the island of Luzon in the Philippines and southern parts of Sulawesi in New Guinea.

[1][5] As of June 2024[update], it has not been assessed by the International Union for Conservation of Nature (IUCN).