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Mahalo California: The tarweed origin of Hawaiian silverswords

April 19 @ 7:30 pm - 9:00 pm

Dr. Bruce Baldwin, Professor, Department of Integrative Biology, UC Berkeley, and Curator Jepson Herbarium

Mahalo California: The tarweed origin of Hawaiian silverswords

The idea that the spectacular Hawaiian silverswords and relatively humble California tarweeds have a natural affinity goes back to the mid-1800s, when Asa Gray placed them together as the exclusive representatives of subtribe Madiinae, in the sunflower family, Asteraceae.  That classification proved controversial for well over a hundred years, until detailed studies supported and extended gray’s hypothesis. Thanks to careful anatomical work by the late, great Sherwin Carlquist and a series of subsequent evolutionary studies, we now have a more refined understanding of the relationship between tarweeds and silverswords and an emerging picture of how both groups have diversified as exemplars of adaptive radiation in oceanic islands or island-like environments, including the Mediterranean-like California Floristic Province. Join us for a presentation about those radiations and the beautiful diversity of plants that arose from them both in California and Hawaii.

Bio: Since 1994, Bruce has served as convening editor of the Jepson Flora Project, which has produced The Jepson Manual: Vascular Plants of California and The Jepson Desert Manual: Vascular Plants of Southeastern California, and currently produces the Jepson eFlora — a living, regularly updated online flora of California. His research focuses on evolution and diversity of the native California flora and Hawaiian plants that descend from Californian lineages, with an emphasis on the sunflower family.


April 19
7:30 pm - 9:00 pm
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Luther Burbank Art and Garden Center
2050 Yulupa Ave
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Milo Baker