Costus guanaiensis is a highly variable and widespread species characterized by appendaged bracts and mostly white flowers with red stripes and a yellow blotch on the labellum. There are three named varieties, but the differences have nothing to do with the bract shapes or the flower colors - they are minor differences in the hair structure on the leaves, that frankly I have not been able to distinguish in the field.
This listing is for a plant that typifies the species, but there is some variation depending on the collection site. They are quite tall, usually growing to about 8-10 feet at maturity, and the flower colors should be mostly white as in the photos here. The leaves are large and tropical looking.
Costus guanaiensis should be grown outdoors over winter only in USDA zone 10 as they are not hardy in colder areas. They prefer a fairly sunny area but will grow in part sun or light shade.