Magnolias in Rochester, New York, undated, via Arthur Peck Collection, OSU Special Collections & Archives Commons on flickr.
Since the late 19th century, Oxford Street in the city’s Park Avenue neighborhood has attracted visitors in May for its display of blooming magnolia trees. There is another vintage picture of the trees here.
Arthur Peck was a Professor of Landscape Architecture at the Oregon Agricultural College* from 1908 to 1948. This picture was part of his teaching library of 24 boxes of glass lantern slides — now in OSU’s archives.
*The college later became Oregon State University (OSU).
enclos*ure 
I lived on Berkeley St. in Rochester not far from Oxford after college in the early 1970s. You can see the naming theme! I have no recollection of this scene, though my roomate and I did always go see the lilacs. Rochester is known as the “flower city” after its earlier incarnation as the “flour” city.