Peter H. Raven: Botanist, evolutionary biologist, and biodiversity champion

Peter H. Raven: Botanist, evolutionary biologist, and biodiversity champion Abstract Peter H. Raven was a transformative leader whose influence extended far beyond his own research. From a precocious childhood passion for natural history to landmark contributions to coevolution, ecological speciation, biogeography, and botanical systematics, his career reshaped modern plant science. He was also an extraordinary mentor, collaborator, and institution builder spending most of his career as Director of the Missouri Botanical Garden and professor at Washington University in Saint Louis, while taking leadership roles at the National Academy of Sciences, the National Geographic Society, and many other organizations. Raven advanced global biodiversity conservation and scientific infrastructure and worked tirelessly to provide opportunities for emerging scholars worldwide. His legacy lies not only in the breadth of his scholarship and public service but also in his enduring commitment to connecting people, fostering collaboration, and helping others realize their potential. Acknowledgments Author contributions J.B.L., G.B.J., and B.A.S. wrote the paper. Competing interests The authors declare no competing interest. References 1 Nine PBS, “Living St. Louis” (St. Louis PBS station, 2021) https://www.youtube.com/watch?v=5E4yBEf4yig. Accessed 4 August 2026. 2 P. H. Raven, Driven by Nature: A Personal Journey from Shaghai to Botany and Global Sustainability (Missouri Botanical Garden Press, Saint Louis, 2021). 3 P. R. Ehrlich, P. H. Raven, Butterflies and plants, a study in coevolution. Evolution 18, 586–608 (1964). 4 P. R. Ehrlich, P. H. Raven, Differentiation of populations: Gene flow seems to be less important in speciation than the neo-Darwinians thought. Science 165, 1228–1232 (1969). 5 P. H. Raven, D. I. Axelrod, Angiosperm biogeography and past continental movements. Ann. Mo. Bot. Gard. 61, 539–673 (1974). 6 Z. Y. Wu, P. H. Raven, D. Y. Hong, Eds., Flora of China. 25 vols and 24 vols of illustrations (Science Press, Beijing, and Missouri Botanical Garden Press, St. Louis, 1994–2013). 7 P. R. Raven, H. Curtis, Biology of Plants (Worth Publishers Inc., New York, 1970), p. xi+706. 8 P. R. Raven, G. B. Johnson, Biology (C. V. Mosby Publishers, Saint Louis, 1986), p. xxx+1198. 9 P. R. Ehrlich, A. H. Ehrlich, The Population Bomb (Ballantine Books, 1968). 10 PCAST Biodiversity and Ecosystems Panel, Teaming with Life: Investing in Science to Understand and Use America’s Living Capital (President’s Committee of Advisors on Science and Technology, Biodiversity and Ecosystems Panel, 1998). 11 R. Rosenblatt, Heart and flowers. Time 153, 48–51 (1999). 12 P. Raven, Plants named for world-renowned botanist and 40-year leader of Missouri Botanical Garden. Ladue News (2026). https://www.laduenews.com/home/pat-raven-peter-plants-dark-iris-foxglove-zz-mobot-missouri-botanical-garden-grow/article_9a7508b3-c584-46da-a1ee-979b04379b1e.html. 21 May 2026. 13 S. G. Stolberg, Scientists urge bigger supply of stem cells. New York Times, 11 September 2001, Section A, p. 1. 14 K. Q. Seelye, Arsenic standard for water is too lax, study concludes. New York Times, 11 September 2001, Section A, p. 20. 15 N. B. Jackson, Scientist at work: Dr. Peter S. Raven; through politicking for plants, he made his garden grow. New York Times, 4 August 1998, Section F, p. 3. 16 K. Schneider, Peter Raven dies at 89; botanist warned of perils of climate change. New York Times, 1 May 2026, Section A, p. 24. Information & Authors Information Published in Copyright © 2026. This article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND). Submission history Published online: August 19, 2026 Published in issue: August 25, 2026 Acknowledgments Author contributions J.B.L., G.B.J., and B.A.S. wrote the paper. Competing interests The authors declare no competing interest. Notes * Once at a conference, a scientist came up to Raven and proclaimed excitedly “I’m delighted to meet you—you’re the genus to my species.” † Raven was born in Shanghai sparking a life-long interest in China even though the Ravens moved to the United States before he was a year old. Authors Metrics & Citations Metrics Altmetrics Citations Cite this article Peter H. Raven: Botanist, evolutionary biologist, and biodiversity champion, Proc. Natl. Acad. Sci. U.S.A. 123 (34) e2624553123, https://doi.org/10.1073/pnas.2624553123 (2026). Copied! Copying failed. Export the article citation data by selecting a format from the list below and clicking Export. View Options View options Download this article as a PDF file. PDFPDF and Supporting Information Download the article PDF and supporting information. Download PDF and supporting informationeReader View this article with eReader. eReaderFigures Tables Media References References References 1 Nine PBS, “Living St. Louis” (St. Louis PBS station, 2021) https://www.youtube.com/watch?v=5E4yBEf4yig. Accessed 4 August 2026. 2 P. H. Raven, Driven by Nature: A Personal Journey from Shaghai to Botany and Global Sustainability (Missouri Botanical Garden Press, Saint Louis, 2021). 3 P. R. Ehrlich, P. H. Raven, Butterflies and plants, a study in coevolution. Evolution 18, 586–608 (1964). 4 P. R. Ehrlich, P. H. Raven, Differentiation of populations: Gene flow seems to be less important in speciation than the neo-Darwinians thought. Science 165, 1228–1232 (1969). 5 P. H. Raven, D. I. Axelrod, Angiosperm biogeography and past continental movements. Ann. Mo. Bot. Gard. 61, 539–673 (1974). 6 Z. Y. Wu, P. H. Raven, D. Y. Hong, Eds., Flora of China. 25 vols and 24 vols of illustrations (Science Press, Beijing, and Missouri Botanical Garden Press, St. Louis, 1994–2013). 7 P. R. Raven, H. Curtis, Biology of Plants (Worth Publishers Inc., New York, 1970), p. xi+706. 8 P. R. Raven, G. B. Johnson, Biology (C. V. Mosby Publishers, Saint Louis, 1986), p. xxx+1198. 9 P. R. Ehrlich, A. H. Ehrlich, The Population Bomb (Ballantine Books, 1968). 10 PCAST Biodiversity and Ecosystems Panel, Teaming with Life: Investing in Science to Understand and Use America’s Living Capital (President’s Committee of Advisors on Science and Technology, Biodiversity and Ecosystems Panel, 1998). 11 R. Rosenblatt, Heart and flowers. Time 153, 48–51 (1999). 12 P. Raven, Plants named for world-renowned botanist and 40-year leader of Missouri Botanical Garden. Ladue News (2026). https://www.laduenews.com/home/pat-raven-peter-plants-dark-iris-foxglove-zz-mobot-missouri-botanical-garden-grow/article_9a7508b3-c584-46da-a1ee-979b04379b1e.html. 21 May 2026. 13 S. G. Stolberg, Scientists urge bigger supply of stem cells. New York Times, 11 September 2001, Section A, p. 1. 14 K. Q. Seelye, Arsenic standard for water is too lax, study concludes. New York Times, 11 September 2001, Section A, p. 20. 15 N. B. Jackson, Scientist at work: Dr. Peter S. Raven; through politicking for plants, he made his garden grow. New York Times, 4 August 1998, Section F, p. 3. 16 K. Schneider, Peter Raven dies at 89; botanist warned of perils of climate change. New York Times, 1 May 2026, Section A, p. 24.