Which poem by Ezra Pound is highly celebrated and well-known?

"In a Station of the Metro" is a highly celebrated poem by Ezra Pound that exemplifies his imagist style, focusing on brevity and precision in language to evoke strong imagery. This poem stands out for its vivid representation of an urban moment, capturing the essence of people passing through a subway station. It uses an innovative metaphor where the faces of the commuters are likened to petals on a wet, black bough, creating a striking visual contrast and resonance. The poem's conciseness and reliance on imagery showcase Pound's modernist approach, emphasizing immediate experience over elaborate description.

The other options, while significant in their own right, do not fit the criteria as precisely. "The River Merchant's Wife: A Letter" is a well-known poem by Pound but leans more towards narrative; "The Wasteland," although iconic, is actually a work by T.S. Eliot; and "Howl" is a revolutionary poem written by Allen Ginsberg, which is celebrated for its content and themes but falls outside of Pound's body of work. Thus, "In a Station of the Metro" is recognized as a defining poem of Pound's legacy in modernist literature.