Convallaria montana is, debatably, a native North American lily-of-the-valley species. Its natural range (assuming it is not actually a naturalized introduced species) is a limited area in Georgia, Kentucky, North and South Carolina, Tennessee, Virginia and West Virginia, where it inhabits montane slopes and woods, in acidic and sandy soils.

The most noticeable feature that distinguishes it from the very commonly-grown European species, Convallaria majalis (which frequently escapes into the wild), is that the midribs on the flower tepals are green, unlike on Convallaria majalis.

Ref. Flora of North America (www.eFloras.org)

Unless your plants were collected from these wild populations as plants or seed, and unless they show the characteristics of this species as noted above, they are most likely Convallaria majalis.

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