I checked on SIGNA and it looks like you might be right. I think I have one as well. I didn't realize how close they were to Siberians.

Here is mine, and it looks very similar to yours, red spathes, too. I was told it was a Siberian. The falls are narrower than my white Siberian.

Hi SirMatthew,
Yours does look like mine, and they both look like the SIGNA site photos.
I also read the botanical description:
Rhizomes creeping, thick. Leaves linear, 20--60 cm ÃÂ 5--13 mm, midvein obscure. Flowering stems sometimes with a short branch, 40--60 cm, solid, 1- or 2-leaved; spathes 3, green, often reddish at base, lanceolate, 5--7 ÃÂ ca. 1 cm, 2-flowered, apex acuminate. Flowers bluish violet or white, 6--7 cm in diam. Perianth tube 8--10 mm; outer segments obovate, claw with conspicuous, brown reticulate pattern on yellow background; inner segments erect, narrowly obovate, 4--5 ÃÂ ca. 1.5 cm. Filaments white, ca. 3 cm; anthers yellow. Ovary 1.5--2 cm ÃÂ 3--4 mm. Style branches ca. 3.5 cm ÃÂ 5 mm. Capsule ellipsoid-cyl

The description fits and I remember that the base of the leaves also shows a reddish color.
Remy