There seems to be a lot of confusion out there about the orange daylily, hemerocallis fulva.
Let's start with it's name: Orange daylily. That's it. They are sometimes called tawny daylily. Many people call these tiger lilies, but those are completely different plant, Lilium lancifolium.
Now to the plant: Despite the fact that these guys have become NATURALIZED across all of the Eastern states, they are not at all native to the Americas. These are Asian plants. In fact DCNR considers them to be invasive in PA. That means that they displace native species, especially in sensitive areas. They form very dense patches, and are incredibly difficult to remove once established. If you are removing some from your own property, be very careful how you dispose of the tubers, as they can readily start to grow again even in adverse conditions.
So, what if you want the look of orange daylilies? There are thousands of daylily options out there that are not invasive. It would be quite easy to find an orange version that would make you happy. If you are looking for something native, consider Canada lily (Lilium canadense), wood lily (L. philadelphicum) or Turk’s cap lily (L. superbum). If you're looking for a swath of orange, the orange coneflower (Rudbeckia fulgida) will fit the bill.
Sources: DCNR Invasive Plant Fact Sheet, Missouri Botanical Garden