The genus Pteris comprises over 200 tropical and subtropical species, and hybridization among its species is well known. Many of the species-groups, such as the P. longifolia and quadriaurita groups, include both Old World and New World endemics. The Chinese Ladder Brake, P. vittata L., which is a member of the P. longifolia group, has been introduced into the Americas, where it frequently grows with or near closely related native species. For instance, Maxon (1926, p. 436) wrote that P. vittata "has escaped from cultivation and become well established
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