Rosa is a genus of prickly shrubs; stipules large, attached to the leaf stalk.
Leaves alternate, pinnately compound, often prickly on veins of back.
Flowers conspicuous, pink, red, white occasionally yellow. Radially symmetrical, sepals elongate, often persistent; ovary enclosed in a cup-like structure (hypanthium), with a constricted orifice, stamens numerous, longer than orifice of hypanthium, ovaries numerous.
Fruit a hard achene, enclosed in the fleshy, usually red, hypanthium (hip). Rosa multiflora.en.wikipedia.org.