Two extra-limital species of Spiranthes have been reported from the flora. The Central American S. graminea Lindley was reported from southern Arizona (C. A. Luer 1975), based on plants subsequently described as S. delitescens Sheviak. The Asiatic S. sinensis Persoon was reported from Florida (J. Beckner 1996) based on plants of S. vernalis with unusual orange markings on the lips.