(Callitriche brutia hamulata)
Stellaria longifolia is a species of flowering plant in the family Caryophyllaceae known by the common name longleaf starwort. It is native to much of the northern half of the Northern Hemisphere, occurring throughout northern Europe and North America. It grows in many types of moist habitat, including meadows, marshes, and roadsides. It is a rhizomatous perennial herb forming clumps with sprawling, branching stems which are mostly hairless except for tiny rough hairs along the edges of the squarish stem. The linear to lance-shaped leaves are up to 3.5 centimeters long and are oppositely arranged in pairs. The inflorescence bears several flowers, each on a short pedicel. The flower has five pointed green sepals each a few millimeters long. There are five white petals, each so deeply lobed it appears to be two. Stellaria is a genus of about 90 to 120 species of flowering plants in the family Caryophyllaceae, with a cosmopolitan distribution. Common names include starwort, stitchwort and chickweed. Stellaria species are relatively small herbs with simple opposite leaves. It produces small flowers with 5 sepals and 5 white petals each usually deeply cleft, or none at all, all free. Stamens 10 or fewer. Some species, including Stellaria media which is widely distributed throughout the Northern Hemisphere, are used as leaf vegetables, often raw in salads. This is a favored food of finches and many other seed-eating birds. Chickweeds are used as food plants by the larvae of some Lepidoptera species including angle shades, heart and dart, riband wave, setaceous Hebrew character and the Coleophora case-bearers C. coenosipennella (feeds exclusively on Stellaria species), C. lineolea (recorded on S. graminea), C. lithargyrinella (recorded on S. holostea), C. solitariella (feeds exclusively on S. holostea) and C. striatipennella. Several closely related plants referred to as chickweed, but which lack the culinary properties of plants in the genus Stellaria, include members of the genus Cerastium, of similar appearance to Stellaria and also in the (Carophyllaceae).