''Hesperostellaria'' is a genus of

flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (). The term angiosperm is derived from the Ancient Greek, Greek words (; 'container, vessel') and (; 'seed'), meaning that the seeds are enclosed with ...

s in the family

Caryophyllaceae Caryophyllaceae, commonly called the pink family or carnation family, is a family (biology), family of flowering plants. It is included in the dicotyledon order Caryophyllales in the APG III system, alongside 33 other families, including Amaranth ...

. It contains a single species, ''Hesperostellaria americana'', a perennial native to

subalpine Montane ecosystems are found on the slopes of mountains. The alpine climate in these regions strongly affects the ecosystem because temperatures fall as elevation increases, causing the ecosystem to stratify. This stratification is a crucial f ...

areas of

Alberta Alberta is a Provinces and territories of Canada, province in Canada. It is a part of Western Canada and is one of the three Canadian Prairies, prairie provinces. Alberta is bordered by British Columbia to its west, Saskatchewan to its east, t ...

and

Montana Montana ( ) is a landlocked U.S. state, state in the Mountain states, Mountain West subregion of the Western United States. It is bordered by Idaho to the west, North Dakota to the east, South Dakota to the southeast, Wyoming to the south, an ...

. The species was first described as ''Stellaria dichotoma'' var. ''americana'' in 1894, and later renamed ''Stellaria americana''. In 2023 it was placed in the new monotypic genus ''Hesperostellaria'' as ''Hesperostellaria americana''.

References

{{Taxonbar, from=Q132400050, from2=Q135471145, from3=Q15574911 Caryophyllaceae Monotypic Caryophyllaceae genera Flora of Alberta Flora of Montana Taxa described in 2023