This is the plant that is sold by Aloha Tropicals under the name "Barbatus Dwarf", but it is not Costus barbatus. As a matter of fact, even the plant that is widely sold as Costus barbatus is not really Costus barbatus. I finally discovered the "real" Costus barbatus in 2011, but that is another story, told elsewhere on my website.
This one appears to be a form of Costus productus. The plant grows to about 3 feet tall and has very pretty plicate foliage. I grow it in part shade during the summer but it is not hardy outdoors here in my Tallahassee zone 8-B garden.
In June 2016 a name-the-costus contest was held on Facebook group Planet Heliconia-Ginger, and the cultivar name 'Dwarf Star'was the winner.