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Bromeliaceae family

Pitcairnia angustifolia
Aiton
var. angustifolia, Hortus Kew. 1: 401.  1789.
Bas.: Pitcairnia latifolia Aiton (1789).

Kawata. Zannanna djab, mawon, gran bwa.
West Indian endemic.
Very common terrestrial, epiphytic and epilithic herb of rocky lower elevations, including fumaroles (the sulphur springs).
Antigua, Saba, St. Eustatius, St. Kitts, Montserrat, Guadeloupe, Dominica, Martinique, St. Lucia, St. Vincent, the Grenadines, Grenada, Barbados, Greater Antilles.
 
A single spike type sometimes called Pitcairnia bifrons found in elfin shrublands - however it may just be an extreme form of this taxon.

Intermediate forms are also found in elfin shrublands and on exposed ridges at about 700m elevation in the  Mount Gimie area. They may be hybrids between P. bifrons and P. angustifolia.

Another explanation is that P. bifrons and P. angustifolia and the intermediate forms are a single variable taxon, P.angustifolia.
DNA analysis would be very interesting!