About Carex amphibola Steud.
Carex amphibola Steud., commonly called gray sedge, is a species of flowering plant in the family Cyperaceae. It was first formally named in 1855. This species is native to eastern Canada and the eastern United States. It is frequently confused with Carex grisea, and the two can be distinguished by features of their perigynia: C. amphibola has gray-green perigynia with angular tips, while C. grisea has somewhat greener perigynia with more rounded tips. At maturity, the perigynia of C. amphibola are somewhat more clustered and spreading, whereas those of C. grisea are strongly ascending. C. amphibola grows in mesic deciduous forests, most often in loamy areas located near streams.
