Rubus is a large and diverse genus of flowering plants in the rose family, Rosaceae, subfamily Rosoideae, commonly known as brambles.[6] Most of these plants have woody stems with prickles like roses; spines, bristles, and gland-tipped hairs are also common in the genus.[15] The genus has a likely North American origin,[15] with fossils known from the Eocene-aged Florissant Formation of Colorado, around 34 million years old.[17] Many fossil fruits of †Rubus laticostatus, †Rubus microspermus and †Rubus semirotundatus have been extracted from bore hole samples of the Middle Miocene fresh water deposits in Nowy Sacz Basin, West Carpathians, Poland.As Rubus species readily interbreed and are apomicts (able to set seed without fertilisation), the parentage of these plants is often highly complex, but is generally agreed to include cultivars of blackberries (R. ursinus, R. fruticosus) and raspberries (R. idaeus).