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Arnold Arboretum

Collection Statistics

As of March 2014, the living collections comprised 14,901 individual plants (including nursery holdings) belonging to 10,239 accessions representing 3,885 taxa. Taken together, the collections are considered to be one of the largest (Table 1) and best documented (Table 2) woody plant collections in North America and the world. Many of these accessions or accession lineages are of historical and botanical importance, representing the original North American introductions of Eastern Asian plants collected by Arboretum staff and affiliates such as Charles Sprague Sargent, Ernest H. Wilson [pdf], John G. Jack [pdf], Joseph Rock [pdf], and William Purdom [pdf].

Search our living, legacy (dead), and herbaria collection inventories for plants of interest.

Table 1. Taxonomic profile of the Living Collections of the Arnold Arboretum.a
Families 100
Genera 345
Species 2,123
Subspecies 79
Varieties 363
Formae 72
Cultivars 1,491
Infraspecific Hybrids 443
Intergeneric Hybrids 14

aNumbers for infraspecific ranks correspond only to those accessions where rank is known.

Table 2. Provenance of Accessions in the Living Collections of the Arnold Arboretum.
Direct 2,759 27
Indirecta 793 8
Garden 3,145 31
Uncertainb 3,542 34

aFrom a cultivated plant of known (indirect) wild origin.
bIncludes 2,153 existing or spontaneous accessions whose provenance cannot be determined.

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