Collection Statistics

Collection Statistics

Living Collections

As of February 2016, the living collections comprised 15,187 individual plants (including nursery holdings) belonging to 10,496 accessions representing 3,780 taxa. Taken together, the collections are considered to be one of the largest and best documented 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].

Table 1. Taxonomic profile of the Living Collections of the Arnold Arboretum.a
RANK NUMBER
Families 102
Genera 344
Species 2,092
Subspecies 82
Varieties 354
Formae 69
Cultivars 1,433
Infraspecific Hybrids 449
Intergeneric Hybrids 12

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.
PROVENANCE TOTAL NUMBER PERCENT OF TOTAL
Wild
Direct 2,730 26
Indirecta 803 8
Garden 3,018 29
Uncertainb 3,945 37

aFrom a cultivated plant of known (indirect) wild origin.
bIncludes 2,620 existing or spontaneous accessions whose provenance cannot be determined.

Dead Collections

Only a minority of the accessions ever attempted to be grown in the collections of the Arnold Arboretum are currently alive—some perished, while others representing propagules (seeds, cuttings, etc.) may have never grown to maturity. The records associated with these legacy collections hold immense value in documenting the history of plant introduction, since the Arboretum facilitated the initial point of entry in North America for many species.

As of February 2016, the dead (legacy) collections comprised 67,446 accessions representing 17,756 taxa. Of these, 64,623 individual plants (including nursery holdings) belonging to 43,452 accessions representing 13,607 taxa were inventoried within the living collections before perishing.

Table 3. Taxonomic profile of the Legacy Collections of the Arnold Arboretum.a
RANK NUMBER
Families  218
Genera  1,153
Species  10,562
Subspecies  213
Varieties  1,537
Formae  271
Cultivars  6,327
Infraspecific Hybrids  1,374
Intergeneric Hybrids  95

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

Table 4. Provenance of the Legacy Accessions of the Arnold Arboretum.
PROVENANCE TOTAL NUMBER PERCENT OF TOTAL
Wild
Direct  13,876  21
Indirecta  3,783  6
Garden  18,658  27
Uncertainb  31,129  46

aFrom a cultivated plant of known (indirect) wild origin.
bIncludes 1,178 existing or spontaneous accessions whose provenance cannot be determined.