Collection Statistics

Collection Statistics

Living Collections

As of January 2018, the living collections comprised 15,747 individual plants (including nursery holdings) belonging to 10,868 accessions representing 3,815 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, John G. Jack, Joseph Rock, William Purdom.

Table 1. Taxonomic profile of the Living Collections of the Arnold Arboretum.a
RANK NUMBER
Families 107
Genera 368
Species 2,139
Subspecies 96
Varieties 340
Formae 65
Cultivars 1,437
Infraspecific Hybrids 439
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.
PROVENANCE TOTAL NUMBER PERCENT OF TOTAL
Wild
Direct 2,912 27
Indirecta 845 8
Garden 2,992 27
Uncertainb 4,119 38

aFrom a cultivated plant of known (indirect) wild origin.
bIncludes 2,838 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 (e.g., seed, bud, cutting) 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 January 2018, the legacy collections comprised 68,400 accessions representing 17,228 taxa. Of these, 65,690 individual plants (including nursery holdings) belonging to 44,016 accessions representing 13,242 taxa were inventoried within the living collections before perishing.

Table 3. Taxonomic profile of the Dead Collections of the Arnold Arboretum.a
RANK NUMBER
Families  212
Genera  1,164
Species  9,949
Subspecies  259
Varieties  1,489
Formae  282
Cultivars  6,395
Infraspecific Hybrids  1,469
Intergeneric Hybrids  98

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

Table 4. Provenance of the Dead Accessions of the Arnold Arboretum.
PROVENANCE TOTAL NUMBER PERCENT OF TOTAL
Wild
Direct  14,165  21
Indirecta  3,936  6
Garden  18,909  27
Uncertainb  31,390  46

aFrom a cultivated plant of known (indirect) wild origin.
bIncludes 1,337 existing or spontaneous accessions whose provenance cannot be determined.