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1927 Map of the Arboretum


Sweetbay Magnolia (Magnolia virginiana var. australis) 1275-80*A in flower. Ned Friedman


The Arnold Arboretum’s living collections are celebrated as some of the most comprehensive and best documented of their kind. Its rich holdings include temperate ligneous plants from around the world. Many of the plants originate from collecting expeditions, others derive from horticultural experimentation, and some were existing vegetation when the Arboretum was founded in 1872. Each of these plants—over 15,000 in all—has a story to tell, and they are preserved as both scientific and horticultural specimens to enrich our understanding of biodiversity through the institution’s research, education, and outreach efforts.

Plant Bios

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Stewartia pseudocamelia illustration
11440*A Map it ↗

Japanese Stewartia

Scientific Name
Stewartia pseudocamellia

This Japanese stewartia—and its nearby sibling—was collected in Korea in 1917. Its taxonomic status has inspired the curiosity of generations of botanists. 

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Fallen flowers of Japanese stewartia
Illustration of Kentucky Coffeetree fruit
324*B Map it ↗

Kentucky Coffeetree

Scientific Name
Gymnocladus dioicus

Nearly a century and a half old, this Kentucky coffeetree was one of the first plants grown from seed at the Arnold Arboretum. It was collected in Virginia by an amateur botanist named Allen Curtiss.


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Ripening seedpods of Kentucky coffeetree.


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Today's Walks

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Our self-guided walks are a great way to learn more about our trees and plants from home or as you stroll through the landscape. Forge a deeper connection with the Arnold Arboretum's collections as well as the plants you encounter in your daily life. Explore further with the Expeditions mobile app to hear stories about botany, horticulture, conservation, and Arboretum history through photos, text, and audio segments.

Expeditions Unveiled

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Exploring the botanical diversity of Appalachia with international collaborators

Kang Wang uses an extendable utility pole with a Japanese harvest blade attached to the end to collect acorns from a Quercus coccinea in southern Ohio. Photo by Jared Rubinstein.