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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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Picea pungens illustration
1476*B Map it ↗

Colorado Blue Spruce

Scientific Name
Picea pungens

This Colorado blue spruce, collected in 1874, shows a clear connection between the Arnold Arboretum and Asa Gray, a celebrated Harvard botanist. The tree is among the oldest plants of known wild origin growing at the Arnold Arboretum. 

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Silhouette of mature spruce.
Fagus sylvatica illustration
14599*A Map it ↗

Parasol Beech

Scientific Name
Fagus sylvatica 'Tortuosa'

Among the many weeping trees at the Arnold Arboretum, this mutant European beech is among the most magnificent. Its shoots spiral, twist, and even loop.

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Spiraling trunk of Fagus sylvatica


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Today's Walks

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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.