Alternanthera sp. - low attractive plant

[Al in Kona]

The below two pics of this Alternanthera sp grows as a very low slightly spreading plant and appears to be mostly always in flower as the new leaves are very white and stand out. Does anyone know anything about this plant? Do you have it or have experience growing it? Any help, advise o pictures appreciated.

[Eric in Orlando]

It looks like the cultivar 'Snowball'. It was slow for us when we first planted it but eventually it sppeded up and actually "climbed" up through some other plants. We grew it in bright shade, in deep shade it lost a lot of the white coloring. The ones we planted in sun burned up but the shaded ones grew out into more sun on their own.