Craig,
Interesting to know it is 51 inches wide. That is too wide for it to be made in the 1880s or 1890s. Dress fabrics were made on a more narrow loom, and so the fabric itself was more narrow. I suppose there could be some rare exception to this rule but the width indicates a 20th century textile. You could do some more research on that.
Is it a lightweight fabric such as used for dresses, or is more medium weight? What is the repeat of the pattern, that is the size in inches of each floral bouquet? Just wondering if this was made for dressmaking or upholstery use.
Also, you should determine if it is indeed silk. Probably is, but you want to be sure. you can do a burn test and let us know the results. Snip a tiny piece and place it over a flame (not a match head) and watch it burn (let it self exinnguish or gently blow it out) and then smell the ashes while the smoke is still present. If it smells like burning hair it is silk. If not, it may be rayon or some other fiber.
It is vintage and is gorgeous and the fact that you have so much of it is wonderful.