At this time of year, I find it difficult to resist the dreamy, twilit, death-haunted pull of the Nineties poets. No falling or fallen leaves are to be found in the following poem. However, it was written on August 22, 1895. Thus, according to my definition of autumn, it qualifies as an autumn poem.
What's more, the poem contains a variation on the word "rustle." Autumn is the season of rustling, wouldn't you say? Sooner or later, everything rustles in autumn -- not just the leaves. In this case, the rustling is done by the darkness, which makes perfect sense.
The pale grey sea crawls stealthily
Up the pale lilac of the beach;
A bluer grey, the waters reach
To where the horizon ends the sea.
Flushed with a tinge of dusky rose,
The clouds, a twilit lavender,
Flood the low sky, and duskier
The mist comes flooding in, and flows
Into the twilight of the land,
And darkness, coming softly down,
Rustles across the fading sand
And folds its arms about the town.
Arthur Symons, Amoris Victima (1897). In a note to the poem, Symons states that it was written at Dieppe -- a favorite retreat of Decadent poets and artists.
Earlier in his career, Symons wrote a series of three poems that appeared under the heading "Colour Studies." ("Twilight" itself is a fine "colour study," what with its "pale grey sea," "pale lilac," "dusky rose," and "twilit lavender.") The following poem is the first of the three. Symons dedicated it to the painter Walter Sickert. It was written on September 16, 1893.
The grey-green stretch of sandy grass,
A sea of lead, a sky of slate;
Already autumn in the air, alas!
One stark monotony of stone,
The long hotel, acutely white,
Against the after-sunset light
Withers grey-green, and takes the grass's tone.
Listless and endless it outlies,
And means, to you and me, no more
Than any pebble on the shore,
Or this indifferent moment as it dies.
Arthur Symons, London Nights (1895). "Indefinitely desolate" and "acutely white" are very nice.