Hartmaniella oxyphylla, the robust starwort or Robinson's starwort, is a rare species of plant endemic to the north-western United States, where it is known only from Kootenai and Shoshone Counties, Idaho. It grows along stream-banks in conifer forests at elevations of 800–900 m.Flora of North America vol 5.
Description Hartmaniella oxyphylla is an annual herb with fibrous roots. Stems are 4-angled, up to 30 cm long, with a thin line of hairs along one side. Leaves are narrow, up to 12 cm long. Flowers have green sepals and white petals.Hartman, Ronald Lee & Rabeler, Richard Kevin. 2004. Pseudostellaria oxyphylla (Caryophyllaceae), a long overlooked species from northern Idaho. Sida 21(1): 175-179.Robinson, Benjamin Lincoln. 1898. New species and extended ranges of North American Caryophyllaceae. Botanical Gazette 25(3): 165–171..Hitchcock, C. Leo, & Arthur Cronquist. 1959-1965. Flora of the Pacific Northwest: An Illustrated Manual. University of Washington Press, Seattle.
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