USDA, NRCS. 2012. The PLANTS Database (http://plants.usda.gov, 15 October 2012). National Plant Data Team, Greensboro, NC 27401-4901 USA.
Typically held upright, this rhizomatous plant will tend to flop if given excessive moisture and nutrients. True to its name, the single, showy inflorescence is up to 1' long, consisting of an erect panicle of small, yellow compound flowers. Bees are particularly attracted to this goldenrod as well as the caterpillars of many moths.
For more information on this plant, visit the USDA PLANTS Database: http://plants.usda.gov/java/profile?symbol=SOSP2