Spergularia atrosperma is a species of flowering plant in the family Caryophyllaceae known by the common name blackseed sandspurry. It is native to California and Nevada, where it grows in muddy and sandy habitat, often in moist alkaline substrates. It is a small annual herb producing a slender stem up to 15 centimeters long. It is lined with fleshy linear leaves. The inflorescence bears small flowers with five pointed sepals and five oval white or pink petals. The fruit is a capsule containing shiny, sometimes iridescent, black seeds. References External links Calflora Database: Spergularia atrosperma (Blackseed sandspurry, Sand spurrey) Jepson Manual eFlora (TJM2) treatment of Spergularia atrosperma USDA Plants Profile for Spergularia atrosperma Flora of North America UC Photos gallery: Spergularia atrosperma atrosperma Flora of California Flora of Nevada Natural history of the Central Valley (California) Natural history of the Peninsular Ranges Flora without expected TNC conservation status