Rosa palustris Marsh.

Taller than R. carolina, to about 6 ft. Stems with paired stout more or less curved prickles at the nodes, otherwise almost unarmed. A very marked difference between this species and R. carolina lies in the very fine, close-toothing of the leaflets, the average number of teeth on each side being twenty-six according to Mrs Erlanson, against an average of twelve in R. carolina and fourteen in R. virginiana. Stipules as in R. carolina, but more frequently inrolled into a tube. Flowers usually in corymbs, rarely solitary, with very numerous stamens, borne later than in R. carolina (July and August).R. palustris, as its name implies, is usually found in swampy places, but has much the same geographical distribution as R. carolina. Like that species it spreads vigorously by suckers and does not need a wet soil in gardens.