This little red California flower rapidly evolved to save itself from drought

California’s native scarlet monkeyflowers usually love water and moist areas. Their little red petals attract hummingbirds, making them popular for gardens. But during the state’s historic drought in the 2010s, they suffered.

“ It was really hard to watch these populations dwindle,” said Amy Angert, a professor at the University of British Columbia who’s been studying the wildflowers for nearly 30 years. “[It] was really heartbreaking.”

The plants were dying off, even fully disappearing in some places. They couldn’t survive in the extremely dry soil. But then something surprising happened. The wildflowers adapted.

A new study from researchers at Cornell University and the University of British Columbia has found that over a few years, some of the state’s scarlet monkeyflowers successfully, rapidly evolved to save themselves from climate change, likely the first fully recorded finding of such for plants.

The ground-breaking study

Plant adaptation can be compared to like jogging on a treadmill — and climate change is speeding that treadmill up really fast. Researchers have been concerned for years that plants might not be able to run fast enough to keep up, which could cause them to go extinct.

When the study started in 2010, the team set out to monitor monkeyflower populations over time to see how they waxed and waned in different conditions. They observed the plants in places like the San Bernardino mountains, Sequoia National Park, Kings Canyon and Yosemite.

Angert, who was the team leader and senior researcher, had no idea the drought would come two years later. But the heavy dry-spell created an opportunity: The team used a “time capsule” of old seeds to see how newer monkeyflowers were faring in the bone-dry soil. Some populations were luckier than others.

Through genome sequencing, researchers found that some genetic differences that appeared in plants in hot and dry places were occurring more often — even in spots where they weren’t that common before the drought.

It seemed some monkeyflowers were evolving themselves to have this adaptive trait, allowing them to not only survive the drought but also recover. This process has an official name: evolutionary rescue.

When it comes to the scarlet monkeyflowers’ physical traits, they aren’t sure what the genetic differences do. However, Angert says the populations that recovered the best were the ones that lost less water through the pores on their leaves — the stomata — while they were opening up for photosynthesis.

What this means for other plants

Angert was excited to see climate resilience in action, but cautions against taking this as a sign that we don’t need to worry about monkeyflowers or nature in general.

“Even in this species, it wasn’t all the populations that actually were resilient,” Angert added. “We saw three of them go to local extinction, and one of them hasn’t come back yet.”

It’s a hopeful tale — not a silver bullet. Still, the findings are significant. Angert says that, according to her knowledge, this is the first recorded finding of evolutionary rescue in the wild — a plant evolving to save itself and successfully doing so.

The million-dollar question is whether it can apply to other species. For now, the study suggests that if there are other species with the right set of genetic differences, they could also be resilient.

“ But of course, the challenge is figuring out which ones those are,” Angert said.