This is a tall perennial (ht 1.2 m) from the Marantaceae family, with elegant, silvery-grey oblong leaves, richly marked with dark veins and deep purple undersides. I have it in shaded parts of my garden, where it looks attractive at all times and asks very little of me, except to occasionally pull up bits that have wandered a little too far - but I don't regard it as an invasive plant. I cut ragged leaves off at the base every so often. It is perfect for filling a dry corner under trees or masking unappealing fences. Although these plants reputedly need moisture, I find mine cope well in dry shade. I enjoy it with an underplanting of similarly toned Tradescantia 'Zebrina' or with white flowers that tolerate shade, such as Clerodendrum wallichii. They also look good grown with plants of a similar bold foliage shape but coloured green: such as Aspidistra and Spathiphyllum. To propagate, simply pot up some of the rhizomes. The original species comes from Brazil. I have also seen a cultivar called 'Silver Star' that looks very similar to this one - I am not sure what the difference is.
I have seen 'Grey Star' used as an indoor plant, looking very effective.
Postscript: Having grown this for quite a few years, I have realised it IS an invasive plant. Mine was been planted in a very dry, shaded area, where it probably don't spread as much as in a better garden spot, but it still does form very large clumps and start to appear in the middle of other plants. I now don't recommend it, except when confined to a pot or sited in an area where nothing else will grow and you honestly don't mind if it takes over!