Stellaria porsildii is a rare species of flowering plant in the family Caryophyllaceae known by the common name Porsild's starwort.

[1] This perennial herb produces an erect, four-sided stem up to about 20 centimeters long from a rhizome.

The green, non-waxy leaves are linear to lance-shaped and roughly 3 centimeters long.

The flowers, each about a centimeter wide, have five white petals and ten stamens.

[3] The plant occurs in openings and on the edges of forests of oak, pine, poplar, and Douglas-fir.