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A Scientist Without Boundaries

Mexican-American scientist Ynes Mexia explored the world and helped expand what we know about plants.

Ynes Mexia smiling and holding binoculars with a botanical pattern behind her.

 © California Academy of Sciences, © Natalia Slavetskaya/Dreamstime.com; Photo illustration Encyclopædia Britannica, Inc.

Ynes Mexia was a botanist who identified many plant species.

Until very recently, many people thought explorers had to be men. They thought the world was too dangerous for women to explore alone. But women explored anyway. A botanist named Ynes Mexia was one of them.

Ynes Mexia was born in Washington, D.C., in 1870, to an American mother and a Mexican father. She loved to read, write, and spend time outdoors. When Mexia finished school, she moved to Mexico, where she helped run, and eventually took over, her father’s ranch. After about 30 years, Mexia moved to San Francisco, California. Her love of the outdoors was as strong as ever, so when she met people who were working to help the environment, she joined them. One of the projects she worked on was to help stop loggers from cutting down California’s famous redwood trees.

Mexia’s interest in trees fed a new dream—to become a botanist, a scientist who studies plants. In 1921, at age 51, Mexia enrolled at the University of California, Berkeley, to study this field. She graduated four years later. Mexia wanted to collect specimens (plant samples) so she and other scientists could study them. At the time, though, women were discouraged from traveling alone, especially in the wild, because of beliefs that they were not as capable as men. Mexia didn’t let this stop her.

Four plant specimens on paper with labels and notes.

 Botany Department/Smithsonian National Museum of Natural History (02978415, 03003905, 02917423, 03206174); Photo composite Encyclopædia Britannica, Inc.

Here are four of the thousands of plant specimens that Ynes Mexia collected.

Mexia’s career as a botanist would take her to many parts of North and South America, where she would collect specimens so that she and other scientists could study them. She ventured through Mexico, Peru, Ecuador, and more. She was the first botanist to collect samples in Alaska’s Denali National Park. In total, she collected more than 145,000 specimens. Five hundred of them had never been identified by a botanist before. A few of these are named after Mexia! 

A sample of a plant on paper with typed notes.

Botany Department/Smithsonian National Museum of Natural History (00137722)

This is a sample of a plant genus Mexianthus mexicanus, which is named for Ynes Mexia.

Mexia inspired other women, especially women of color, to live their dreams. By going to college at age 51, Mexia showed it’s never too late to start something new. By traveling far and wide in search of new plants, she showed that exploration was not limited to men.

“I don’t think there is any place in the world where a woman can’t venture,” she once said.

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Did You Know?

The Spanish were some of the first Europeans to settle in what is now the United States. In fact, the oldest city in the U.S. is St. Augustine, Florida. It was founded by the Spanish in 1565! Many of the buildings in St. Augustine are built in a Spanish style.

A large, Spanish-style hotel with palm trees in front.

© Miroslav Liska/Dreamstime.com

Celebrating Hispanic Heritage

September 15 to October 15 is National Hispanic Heritage Month in the United States. To celebrate, we’re highlighting a few notable people with Hispanic and Latino backgrounds.

Portrait of Jovita Idar

© University of Texas at San Antonio Special Collections

Jovita Idar, journalist
(1885–1946)

Born in Texas, Jovita Idar wrote newspaper articles opposing racism and supporting rights for Mexican Americans. She also worked in support of women’s rights. During the Mexican Revolution, a 10-year fight against a Mexican dictator, Idar supported the cause. She also traveled to Mexico to work as a nurse.

Frida Kahlo looks at the camera as she paints a portrait of a woman.

© Bettmann/Getty Images

Frida Kahlo, artist
(1907–1954)

Mexican artist Frida Kahlo was known for her ability to express her emotions in her artwork, especially her self-portraits. Kahlo’s work was bright and colorful, but it also showed the pain she experienced in her life due to health problems and other struggles.

Mario Molina smiles as President Barack Obama puts a medal around his neck.

© Rena Schild/Shutterstock.com

Mario Molina, chemist
(1943–2020)

Mario Molina helped discover that chlorofluorocarbons (CFCs) could destroy the ozone layer, a part of the upper atmosphere that protects Earth from harmful solar radiation. CFCs have been used in aerosol sprays and refrigerants (which are used in air conditioners), and to make plastic foam. Molina’s work has led to efforts to ban the use of CFCs.

José Andrés poses in a kitchen wearing a chef’s jacket

© Francois Nel/Getty Images

José Andrés, chef
(1969–)

After training as a chef in his native Spain, Andrés began working in restaurant kitchens and eventually opened restaurants of his own in the United States. In 2010, Andrés established World Central Kitchen (WCK). The group was founded to gather food that would otherwise go to waste and give it to hungry people. WCK has also traveled to many parts of the world, providing meals to people who have been affected by wars and other disasters.

Hispanic Heritage Month

Photos of Hispanic Americans flash on and off screen.

© Keith Dannemiller/Alamy, © Sundry Photography, Kobby Dagan//Shutterstock.com, © Carlos R, Julio/stock.adobe.com, © Jinlide/Dreamstime.com, Laurence Griffiths, Focus on Sport/Getty Images, Steve Petteway/Collection of the Supreme Court of the United States, Centers for Disease Control and Prevention

Hispanic Heritage Month begins on September 15. You can read about more Hispanic and Latino Americans at Britannica School!

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: the leaves of a plant or of many plants

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