Eriogonum truncatum, the Mount Diablo buckwheat, is a small pink wildflower, believed to have been extinct since 1936 until its rediscovery in 2005.

Diablo buckwheat was by William H. Brewer, the first Chair of Agriculture at the Yale University Sheffield Scientific School.

In 1936 Mary Leolin Bowerman, a graduate student at the University of California, Berkeley and who later co-founded the Save Mount Diablo organization in 1971, recorded the last sighting of Mt.

Diablo has been preserved in the years since Bowerman's study was completed, as well as areas where other buckwheat records were established.

On May 10, 2005, Michael Park, a University of California, Berkeley graduate student, was conducting a floristic study on Mt.

While more thoroughly searching promising areas on the mountain that hadn't gotten enough attention, he realized he was surrounded by early blooming buckwheat.

Coming soon after the announcement of the potential rediscovery of the ivory-billed woodpecker, the news traveled around the world in just a few days and appeared in thousands of media outlets including print, radio and television.

The plant, an annual wildflower which dies after flowering and which is found at just one site, is still considered critically threatened.

It was reported in September 2016, that two botanists performing a wildflower survey in May 2016, at the Black Diamond Regional Preserve, a park near Mount Diablo, had unexpectedly found over a million Mount Diablo buckwheat specimens blooming on a hillside inside the preserve.