Rosa spithamea is a small shrub growing no taller than about half a meter. The stem is studded with a few or many prickles. The glandular leaves are each made up of several double-toothed oval leaflets, the terminal leaflet up to 3 centimeters long. The inflorescence is a cyme of up to 10 flowers with pink petals each up to 1.5 centimeters in length. The fruit is a rose hip about a centimeter wide.