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- Clark, Curtis. 1980. November. Plants of Baja California. Cal Poly Pomona (Field Botany Club).
- Clark, Curtis. 1981. November. Chemical constituents of Encelia trichomes. Cal Poly Pomona (Institute for Cellular and Molecular Biology lunch seminar).
- Clark, Curtis. 1982. June. Plant morphogenesis: biology of nyctinasty. Cal Poly Pomona (Institute for Cellular and Molecular Biology Journal Club).
- Clark, Curtis. 1983. March. Hybridization in Encelia (Compositae: Heliantheae) and its effect on phylogenetic analysis. Cal Poly Pomona (Biological Sciences Faculty Research Seminar).
- Clark, Curtis. 1983. April. Using CYBER word-processing programs. Cal Poly Pomona (Biolunch seminar).
- Clark, Curtis. 1984. January 19. Hybridization in Encelia (Asteraceae: Heliantheae) and its effect on phylogenetic analysis. University of California, Davis (Botany 222 speaker).
- Clark, Curtis. 1984. March 12. Selection against hybrid recombinants as a reproductive isolating mechanism: the syngameon reassessed. San Diego State University (departmental seminar).
- Clark, Curtis. 1985. February 8. Cladistics for real: The systematics of Encelia (Asteraceae: Heliantheae). Rancho Santa Ana Botanic Garden, Claremont, CA (weekly seminar series).
- Clark, Curtis. 1985. November 16. Peripatric speciation and the origin of crop plants. Seventh Symposium of Man, Department of Anthropology, California State University, Fullerton.
- Clark, Curtis. 1987. May 1. Techniques for preparing projection slides for scientific presentations. Rancho Santa Ana Botanic Garden, Claremont CA.
- Clark, Curtis. 1988. November 17. Phylogenetic engineering of brittlebush for revegetation and slope stabilization. California State Polytechnic University, Pomona (Spadra Showcase - research and development projects involving Spadra landfill).
- Clark, Curtis. 1990. November 13. Endangered species: Will there be a tomorrow? Panel discussion at California State Polytechnic University, Pomona.
- Clark, Curtis. 1992. October 24. How dry is a drought? Eighteenth Annual Symposium, Southern California Botanists.
- Clark, Curtis. 1995. March 11. The genus Eschscholzia. Symposium: Out of the Wild and Into the Garden. Rancho Santa Ana Botanic Garden, Claremont CA.
- Clark, Curtis. 1995. May 18. Brittlebushes, Poppies, and Giant Reed: DNA at RSA. Rancho Santa Ana Botanic Garden, Claremont, CA (weekly seminar series).
- Clark, Curtis. 1996. March 13. Evidence for homoploid hybrid speciation in Encelia (Asteraceae: Heliantheae). California State University, Fullerton, CA (weekly seminar series).
- Clark, Curtis. 1996. June 6. The Southern California Black Walnut. Walnut Valley Area Chamber of Commerce breakfast meeting. (handout, 184 kb .pdf)
- Clark, Curtis. 1997. May 24. Phylogeny and adaptation in the Encelia alliance (Asteraceae: Heliantheae). "Evolution and Taxonomy of Southwestern Plants", Thirteenth Annual Southwestern Botanical Systematics Symposium, Rancho Santa Ana Botanic Garden, Claremont, CA.
- Clark, Curtis. 1999. March 5. Finding the right tools: Technology in a biology lab course. Keynote address at "Teaching and Learning with Technology: What Works and How Do You Know", Third Annual Technology Showcase, Teaching, Learning & Technology Roundtable, California State University, Sacramento.
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