Memorial Rose (Rosa wichuraiana)
Also known as Rosa luciae. This is the familiar pink rambling rose of roadsides and banks in the city and suburbs. It often persists around old homesites, but it also seems to appear spontaneously often enough that we can regard it as a naturalized citizen of our flora. This plant was blooming in late May on a hillside in Banksville.
Flowers: Five petals with shallow notches, light pink verging on white at the center, with a generous helping of bright yellow stamens.
Leaves: Dark green, elliptical, very regular, with toothed and pointed leaflets, thorns on the underside at each leaflet junction.
Stems: Arching, up to about six feet (about 2 m) high, or more with support.
All our standard botanical references ignore this plant, which apparently did not escape so frequently in the time of Gray or Britton & Brown.; but the excellent Wildflowers of Western Pennsylvania site has a very good description of the Memorial Rose.