Key to the varieties of Pitcairnia patentiflora
1. Leaf-blades 3-25 mm wide; sepals 13-25 mm long.
2. Leaf-blades serrate throughout, 3-15 mm wide. var patentiflora.
2. Leaf-blades serrate only near base, to 25 mm wide.
3. Sepals 13-18 mm long. var subintegra.
3. Sepals to 25 mm long. var macrantha.
1. Leaf-blades -10 mm wide, serrate throughout; sepals to 27 mm long. var armata. —SeeSmith & Downs 1974