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Peter C. Hoch, Ph.D.

Adjunct Professor
Department of Biology, Washington University
Department of Biology, St. Louis University
Department of Biology, University of Missouri - St. Louis

office phone: + 1 (314) 577-5175
fax: + 1 (314) 577-0820

Missouri Botanical Garden
P.O. Box 299
St. Louis, MO 63166-0299

Ph.D., Washington University, St. Louis, 1978
B.S., Stanford University, 1972
I am interested in understanding plant evolution on a broad scale, why some species and genera are so successful (sometimes even invasive) and why other closely related taxa are rare or threatened. The plant family Onagraceae is my model system of choice: thanks to the efforts of my mentor Peter Raven and many collaborators, we know a great deal about the taxonomy, morphology, anatomy, cytology, embryology, pollination biology, biogeography, molecular systematics, and many other aspects of this moderate-sized (657 species) family. We now are able to ask sophisticated questions about the evolution of the group, how its genome has evolved, what morphological characters have been key in the diversification of certain groups, and others.

I also have developed a strong interest in understanding the impacts of human-influenced environmental changes, and have established a long-term floral phenology study at the Shaw Nature Reserve (SNR) in eastern Missouri, using as a starting point a dataset on flowering at the site developed by Edgar Anderson in 1937-1942. New equipment will provide detailed climatic monitoring at the SNR, as well as site-specific monitoring in multiple local plant communities. With collaborators and students, we will elucidate and explore impacts of climate-driven phenological change on local community pollination ecology.
Available upon request
Research Emphases
Systematics and evolution of Onagraceae (with W. L. Wagner, P. Raven and others)

Systematics and evolution of Epilobium, especially in North America Phylogenetics and biogeography of Ludwigia (with J. Barber, Shih-Hui Liu, C.I Peng, B. Grewell, L. G. Lohmann, and others) Phylogenomics of Onagraceae (with T. Y. Chiang, P. Raven and others) Evolution of the reproductive biology of Oenothera (with K. Krakos, W. L. Wagner, R. Raguso and others) Floristic accounts of Onagraceae, including Flora of China (publ.), Flora Mesoamericana (publ.), Jepson Manual (publ.) Flora of North America (in prep.), and others (with W. L. Wagner, P. Raven, and others)
Climate-related phenological change and associated impacts on pollination systems in plant communities in eastern Missouri (with N. Miller-Struttmann, K. Krakos, and others) Completion of the printed Flora of Pakistan and associated development of the web-accessible Pakistan Plant Database (with S. I. Ali, A. Ali, and others [Karachi])

Selected Publications Wagner, W.L., P.C. Hoch, H. Lewis, & B. J. Grewell. 2012. Onagraceae. Pp. 925-955, in Baldwin, B.G. et al. (eds.). The Jepson Manual: Vascular Plants of California, Second Edition. Univ. California Press, Berkeley. Hoch, P. C. (with P. E. Berry, W. L. Wagner & E. Zardini). 2009. Onagraceae. Pp. 345-359, in Davidse, G. et al. (eds.), Flora Mesoamericana 4(1). Univ. Nac. Autónoma de México. Hoch, P. C. & P. H. Raven. 2008. Onagraceae. Pp. 2641-2663, in Zuloaga, F. O., O. Morrone & M. J. Belgrano (eds.), Catálogo de las Plantas Vasculares del Cono Sur, Vol. 3. Monogr. Syst. Bot. Missouri Botanical Garden 107. Wagner, W. L., P. C. Hoch, and P. H. Raven. 2007. Revised classification of the Onagraceae. Syst. Bot. Monogr. 83: 1-240. Chen, C. J., Hoch, P. C., P. H. Raven, D. E. Boufford, & W. L. Wagner. 2007. Onagraceae. Pp. 400-427. in Wu, Z. Y., P. H. Raven, & Hong D. Y. (eds.) Flora of China 13. Science Press, Beijing; Missouri Botanical Garden Press, St. Louis. Peng, C.-I., C. L. Schmidt, P. C. Hoch & P. H. Raven. 2005. Systematics and evolution of Ludwigia sect. Dantia (Onagraceae). Ann. Missouri Bot. Gard. 92: 307-359. Skvarla, J. J., J. R. Rowley, P. C. Hoch, & W. F. Chissoe. 2005. Viscin threads on the pollen of Circaea X intermedia Ehrh. (Circaeeae: Onagraceae). Taxon 54: 121-126. Funk, V. A., P. C. Hoch, L. A. Prather, & W. L. Wagner. 2005. The importance of vouchers. Taxon 54: 127-129. Clinebell, R. R. II., A. Crowe, D. P. Gregory, and P. C. Hoch. 2004. Pollination ecology of Gaura and Calylophus (Onagraceae, tribe Onagreae) in western Texas, U. S. A. Ann. Missouri Bot. Gard. 93: 369-400. Hoch, P. C. 2004. Proceedings XVI International Botanical Congress, Saint Louis. 155 pp. Missouri Botanical Garden Press, St. Louis. Katinas, L., J. Crisci, W. L. Wagner, and P. C. Hoch. 2004. Geographical diversification of tribes Epilobieae, Gongylocarpeae, and Onagreae (Onagraceae) in North America, based on parsimony analysis of endemicity and track compatibility analysis. Ann. Missouri Bot. Gard. 91: 159-185. Levin, R. A., W. L. Wagner, P. C. Hoch, W. J. Hahn, A. Rodriguez, D. A. Baum, L. Katinas, E. A. Zimmer, and K. J. Sytsma. 2004. Paraphyly in Tribe Onagreae: Insights into phylogenetic relationships of Onagraceae based on nuclear and chloroplast sequence data. Syst. Bot. 29: 147-164. Levin, R. A., W. L. Wagner, P. C. Hoch, M. Nepokroeff, J. C. Pires, E. A. Zimmer, and K. J. Sytsma. 2003. Family-level relationships of Onagraceae based on chloroplast rbcL and ndhF data. Amer. J. Bot. 90: 107-115.