Collection Statistics

Collection Statistics

Living Collections

As of July 2016, the living collections comprised 15,280 individual plants (including nursery holdings) belonging to 10,523 accessions representing 3,819 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 104
Genera 350
Species 2,116
Subspecies 84
Varieties 349
Formae 70
Cultivars 1,459
Infraspecific Hybrids 446
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 2,777 26
Indirecta 792 8
Garden 3,046 29
Uncertainb 3,908 37

aFrom a cultivated plant of known (indirect) wild origin.
bIncludes 2,591 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 July 2016, the dead (legacy) collections comprised 67,675 accessions representing 17,718 taxa. Of these, 64,815 individual plants (including nursery holdings) belonging to 43,547 accessions representing 13,592 taxa were inventoried within the living collections before perishing.

Table 3. Taxonomic profile of the Deada Collections of the Arnold Arboretum.b
RANK NUMBER
Families  217
Genera  1,158
Species  10,475
Subspecies  221
Varieties  1,525
Formae  272
Cultivars  6,353
Infraspecific Hybrids  1,379
Intergeneric Hybrids  96

aIncludes deaccessioned/removed, dead, and unable to locate conditions.
bNumbers for infraspecific ranks correspond only to those accessions where rank is known.

Table 4. Provenance of the Deada Accessions of the Arnold Arboretum.
PROVENANCE TOTAL NUMBER PERCENT OF TOTAL
Wild
Direct  13,893  21
Indirectb  3,864  6
Garden  18,747  27
Uncertainc  31,171  46

aIncludes deaccessioned/removed, dead, and unable to locate conditions.
bFrom a cultivated plant of known (indirect) wild origin.
cIncludes 1,196 existing or spontaneous accessions whose provenance cannot be determined.