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Revision of Spathacanthus Acknowledgments and Literature Cited 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

Acknowledgments: Funding for much of this research was provided by the American Philosophical Society (field work and herbarium studies in Mexico) and the La Amistad Fund of the California Academy of Sciences (herbarium studies in Costa Rica).  Permission to collect plants in Mexico was granted by the Instituto Nacional de Ecológia (Secretaría de Medio Ambiente, Recursos Naturales y Pesca).  I thank the curators of the following herbaria for making specimens available: A, BM, CAS, CHIP, CIES, CR, DAV, DS, DUKE, ENCB, F, GH, K, L, LL, M, MEXU, MICH, MO, NY, P, RSA, TEX, UC, US, USJ, W, WIS.  I thank Ellen del Valle for rendering figure 3 and Peter Fritsch for assisting with the phylogenetic analysis.  I am especially grateful to the Colegio de la Frontera Sur (ECOSUR) and to Mario González E., Guadalupe Olalde R., Neptalí Ramírez M., and Miguel Martínez-Icó for facilitating my field and herbarium studies in Chiapas. Literature Cited: Bremekamp, C. E. B.  1965.  Delimitation and subdivision of the Acanthaceae.  Bull. Bot. Surv. India 7: 21--30. Daniel, T. F.  1988.  Aphanosperma, a new genus of Acanthaceae from Mexico with unusual diaspores.  Amer. J. Bot. 75: 545--550. -----.  1995a.  Acanthaceae.  In Flora of Chiapas, ed. D. E. Breedlove, pt. 4: 1--158. -----.  1995b.  Revision of Odontonema (Acanthaceae) in Mexico.  Contr. Univ. Michigan Herb. 20: 147--171. -----.  1998.  Pollen morphology of Mexican Acanthaceae: diversity and systematic significance.  Proc. Calif. Acad. Sci. (in press). Durkee, L. H.  1986.  Acanthaceae.  In Flora Costaricensis, ed. W. Burger, Fieldiana, Bot. 18: 1--87. Gibson, D. N.  1974.  Acanthaceae.  In Flora of Guatemala, ed. P. C. Standley et al., Fieldiana, Bot. 24(10): 328--461. Lindau, G.  1895.  Acanthaceae.  In Die natürlichen Pflanzenfamilien, ed. A. Engler and K. Prantl, IV(3b): 274--354. Standley, P.C.  1926.  Trees and shrubs of Mexico (Bignoniaceae--Asteraceae).  Contr. U.S. Natl. Herb. 23: 1313--1721. Swofford, D.  1993.  PAUP, phylogenetic analysis using parsimony, version 3.1.1.  Center for Biodiversity, Illinois Natural History Survey.