Collection Statistics

Collection Statistics

Living Collections

At the end of June 2018, the living collections comprised 15,811 individual plants (including nursery holdings) belonging to 10,851 accessions representing 3,806 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 108
Genera 369
Species 2,143
Subspecies 101
Varieties 325
Formae 64
Cultivars 1,430
Infraspecific Hybrids 435
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 3,039 28
Indirecta 843 8
Garden 2,971 27
Uncertainb 3,998 37

aFrom a cultivated plant of known (indirect) wild origin.
bIncludes 2,742 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, graft, 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.

At the end of June 2018, the legacy collections comprised 68,622 accessions representing 17,123 taxa. Of these, 66,047 individual plants (including nursery holdings) belonging to 44,224 accessions representing 13,180 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  1,168
Species  9,822
Subspecies  274
Varieties  1,490
Formae  283
Cultivars  6,409
Infraspecific Hybrids  1,479
Intergeneric Hybrids  98

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

Table 4. Provenance of the Inventoried Accessions of the Arnold Arboretum.
PROVENANCE TOTAL NUMBER PERCENT OF TOTAL
Wild
Direct  14,086  21
Indirecta  3,999  6
Garden  19,036  28
Uncertainb  31,501  45

aFrom a cultivated plant of known (indirect) wild origin.
bIncludes 1,434 existing or spontaneous accessions whose provenance cannot be determined.