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Revision of Spathacanthus Main Thomas F. Daniel Department of Botany California Academy of Sciences Golden Gate Park San Francisco, CA 94118

Main Characteristics Phylogenetic Analysis Generic Description & Key to Species S. hahnianus Additional Specimens Examined S. hoffmannii Additional Specimens Examined S. parviflorus Additional Specimens Examined Acknowledgments & Literature Cited Figure Legend: Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

El Triunfo Cloud Forest (Chiapas, Mexico); Habitat of Spathacanthus parviflorus Spathacanthus Baill. is treated as comprising three species occurring in moist to wet forests of Mexico and Central America. This genus of large shrubs and small trees is distinctive among neotropical Acanthaceae by its very large capsules and seeds, both of which are among the largest known in the family. Few collections of the genus had been made until relatively recently. There is no previous comprehensive treatment of the genus; however, Daniel (1995a) treated two of the species in Mexico.