Eriophorum angustifolium
"Eriophorum angustifolium" differs from other species within the genus "Eriophorum" in its habitat and morphology. Its multiple flower heads and growth from rhizomes distinguish it from "E. vaginatum", which has a single flower head and grows from dense tussocks. Although "E. latifolium" has 2–12 flower heads, it has laxly caespitose (tufted) growth, and its pappi are forked. The smooth peduncles and preference for acidic soil pH distinguishes "E. angustifolium" from "E. gracile", which grows in swamp with a neutral pH and has scabrid (rough) peduncles.