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Leaves binate, from 6 to 11 cm. long, the epiderm thick, hypoderm strong, resin-ducts medial.

Such partitions are sometimes met in other species, P. Pringlei or P. canariensis, where the hypoderm is abundant.

Leaves binate, from 10 to 20 cm. long, stout and rigid; resin-ducts medial, hypoderm multiform, the inner cells gradually larger, remarkably large in the angles of the leaf.

Its leaf-section is peculiar in the remarkable size of the inner cells of the hypoderm, especially in the angles of the leaf.

Leaves binate, from 4 to 8 cm. long; resin-ducts medial, or with an occasional internal duct; hypoderm biform.