At first I thought they were poplars, but the trees are Italian cypress
I think it’s a Monet, because the brushwork looks more like his than the other major impressionists that I can spot. As for color and “blurriness”, remember that this is a scan, from a poor-quality print on a cup that’s been waxed. And I wouldn’t be surprised if the source image for printing was scanned from a book.
One more data point. I think this is a real painting because it looks familiar. That could mean that I saw it in an exhibition, but I also have been getting catalogs from Smithsonian and the Metropolitan Museum of Art for nearly thirty years. I’ve checked the stores online for this, but haven’t found it.