Stellaria calycantha

{{short description|Species of flowering plant in the carnation family Caryophyllaceae}}

{{Speciesbox

|image = Stellariacalycantha1.jpg

|status = {{TNCStatus}}

|status_system = TNC

|status_ref = {{cite web |last1=NatureServe |title=Stellaria calycantha |url=https://explorer.natureserve.org/Taxon/ELEMENT_GLOBAL.2.151091/Stellaria_calycantha |access-date=25 January 2024 |location=Arlington, Virginia |date=2024}}

|genus = Stellaria

|species = calycantha

|authority = (Ledeb.) Bong.

|synonyms = Alsine calycantha
Alsine simcoei
Stellaria simcoei

}}

Stellaria calycantha is a species of flowering plant in the family Caryophyllaceae known by the common name northern starwort.{{PLANTS|id=STCA|taxon=Stellaria calycantha|accessdate=1 December 2015}} It is native to western North America from Alaska and northwestern Canada to California and New Mexico, as well as eastern Russia. It occurs in subalpine and alpine climates, in many types of moist, shady habitats. It is a rhizomatous perennial herb producing a prostrate to erect stem up to 25 centimeters long, taking a clumpy form. The thin oval leaves have smooth edges and pointed tips, and measure up to 2.5 centimeters in length. The inflorescence bears one or more flowers, each on a long pedicel. Each flower has five pointed green sepals, and some flowers have up to five deeply lobed white petals.