in botany, a genus of the icofandra polygamia clas. The petals are five; the calyx has five fleshy segments; and the seeds are numerous, rough, and inserted into the interior side of the calyx. There are 14 species, five of them natives of Britain, viz. the eglanteria, or sweet briar; the spinosissima, or burnet rose; the arvensis, or white- flowered dogs-rose; the villofa, or apple-rose; and the canina, or red-flowered dogs-rose, or hip-tree.