Bogs and Acidic Peatlands of Southern New England by Marsha C. Salett
Taxonomy
Rosa palustris Marsh.
ROSACEAE (Rose Family)
EtymologyRosa is the Latin name for rose; palustris means marsh- or swamp-loving, from the Latin for marsh or swamp.
Synonyms (Common Name)Late Rose, River Rose
DescriptionSwamp-rose is a thorny, deciduous shrub that grows to 6' tall and forms loose colonies in swamps, marshes, and other wet places. Swamp-rose is New England's latest blooming rose, with mildly fragrant, pink flowers that appear from July to late August. Its lower stems bear many stout, conical, downward-hooked prickles; middle and upper stems are smooth except for a pair of hooked prickles at the base of each leaf.
Wetland indicator statusOBL
Plant Heightto 6 feet
LeavesDeciduous, alternate, pinnately-compound with 7 leaflets (sometimes 5 or 9); whole leaf up to 6" long; base of main leaf stalk has two narrow, fused, trough-like stipules. Leaflets: narrowly elliptical to oblanceolate, pointed at both ends, finely toothed, up to 2" long, dull green, slightly downy underside.
Flower/InflorescencePink, 2-2 1/2" wide, 5 petals, 5 sepals, borne singly or in small clusters, mildly fragrant.
Flowering PeriodJuly-August
FruitBony achenes encased in a red, roundish, hairy, fleshy structure commonly called a hip; 1/2" in diameter.
Fruiting PeriodAugust-October
HabitatOpen wooded swamps, shrub swamps, wet thickets, marshes, stream banks, pond and lake margins.
RangeNova Scotia to Minnesota, south to the Gulf of Mexico.
(c) 1998-2006 Marsha C. Salett