Collection Statistics

Collection Statistics

Living Collections

As of October 2016, the living collections comprised 15,526 individual plants (including nursery holdings) belonging to 10,619 accessions representing 3,839 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 105
Genera 358
Species 2,140
Subspecies 89
Varieties 346
Formae 69
Cultivars 1,457
Infraspecific Hybrids 446
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 2,836 27
Indirecta 833 8
Garden 3,060 29
Uncertainb 3,890 36

aFrom a cultivated plant of known (indirect) wild origin.
bIncludes 2,582 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 October 2016, the dead (legacy) collections comprised 67,682 accessions representing 17,639 taxa. Of these, 64,970 individual plants (including nursery holdings) belonging to 43,633 accessions representing 13,576 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  215
Genera  1,159
Species  10,402
Subspecies  238
Varieties  1,520
Formae  274
Cultivars  6,361
Infraspecific Hybrids  1,382
Intergeneric Hybrids  95

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  13,880  21
Indirectb  3,858  6
Garden  18,734  27
Uncertainc  31,210  46

aIncludes deaccessioned/removed, dead, and unable to locate conditions.
bFrom a cultivated plant of known (indirect) wild origin.
cIncludes 1,207 existing or spontaneous accessions whose provenance cannot be determined.