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Nichols Arboretum (123 acres, 49.7 hectares) is an arboretum operated by the University of Michigan, and located on the eastern edge of its Central Campus at 1610 Washington Heights in Ann Arbor, Michigan. The arboretum is open daily until 10:00PM, without charge.

The arboretum was designed in 1906 by O. C. Simonds; many of its plantings date to the 1920s and 1930s. It is particularly known for its Peony Collection, Heathdale Collection (species primarily from Appalachia), and the Dow Prairie.

The arboretum is popularly known as "the Arb." Students flock to the Arb for a variety of outdoor activities, such as jogging and picnicking. During winter, students have been known to go sledding in the Arb using cafeteria trays pilfered from university dining halls. The Arb has been the site of dramatic performances of A Midsummer Night's Dream.

Contents 1 General collection 2 Other collections 3 Natural areas 4 See also 5 External links

• Cedars of Lebanon (Cedrus libani) - four specimens, planted 1946, at the extreme edge of their cold hardiness range.
• Chinese Fringetree (Chionanthus retusus) - believed the only specimen in Michigan.

• Chinese Ginkgos (Ginkgo biloba) - believed planted in 1924.

• Conifers - planted primarily in the 1920s and 1930s. Many species of pine (Pinus), spruce (Picea) and fir (Abies), including ponderosa pine (Pinus ponderosa), lodgepole pine (Pinus rigida), Engelman spruce (Picea engelmannii), and Nordman fir (Abies nordmannii).

• Cotoneasters (Cotoneaster species) - a diverse collection of ornamental cotoneasters.

• Cupressaceae - four genera planted from the 1920s-1950s: junipers (Juniperus), arborvitae (Thuja and Platycladus) and false cypresses (Chamaecyparis).

• Hawthorn - numerous hawthorn species, mostly from the 1920s.

• Korean Quasibark Tree (Picrassma quassioides) - possibly the only specimens in Michigan, planted 1933.

• Larches (Larix) - Japanese larches (Larix kaempferi) planted 1938, with a few European larches (Larix decidua) planted 1952.

• Legume (Fabaceae) - Eastern redbud (Cercis canadensis), American yellowwoods (Cladrastis kentukea), honeylocust (Gleditsia triacanthos), Kentucky coffeetree (Gymnocladus dioicus), black locust (Robinia pseudoacacia), and Japanese pagoda tree (Sophora japonica).

• Magnolias & Relatives - Fraser magnolias (Magnolia fraseri), umbrella magnolias (Magnolia tripetala), tuliptrees (Liriodendron tulipifera).

• Maples, Horse Chestnuts and Buckeyes - planted 1920s and 1930s. Species include Trefoil Maple (Acer cissifolium), Sycamore Maple (Acer pseudoplatanus) and Japanese Maple (Acer palmatum), as well as the genus Aesculus including Horsechestnuts and Buckeyes.

• Oaks - native oaks including red (Quercus rubra), white (Quercus alba), black (Quercus velutina), bur (Quercus macrocarpa), shingle (Quercus imbricaria), and swamp white (Quercus bicolor), as well as three Asian oaks representing sawtooth oak (Quercus acutissima) and oriental oak (Quercus variabilis).

• Turkish Hazelnut (Corylus colurna)

• Ulmaceae - American elms (Ulmus americana), European and Asian elms, Chinese elms (Ulmus parvifolia), several species of hackberries (Celtis spp.), and Japanese zelkovas (Zelkova serrata).

• White Pines (Pinus strobus) - about 150 eastern white pines planted in 1952.

• Centennial Shrub Collection - popular ornamental shrubs and small trees including crab apple trees, hawthorn trees, a lilac collection, and spiraea.
• Dow Prairie and adjacent woods (36 acres, 14 hectares) - restored to pre-European settlement. Plants include Andropogon gerardii, Asclepias tuberosa, Aster oolentangiensis, Aster laevis, Carex bicknellii, Ratibida pinnata, Rudbeckia hirta, Schizachyrium scoparium, Silphium terebinthinaceum, Solidago rigida, Solidago speciosa, Sorghastrum nutans, Vernonia missurica, and Veronicastrum virginicum.
• Gateway Garden - an entry garden based on American meadows, with pools and a dry creek.
• Heathdale - ericaceous and Appalachian Plants, including Catawba and Rosebay rhododendrons (Rhododendron catawbiense and R. maximum), azaleas (Rhododendron spp.), dog-hobble (Leucothoe fontanesiana), mountain laurel (Kalmia latifolia), as well as hemlock (Tsuga canadensis, T. caroliniana, and T. sieboldii), dogwoods (Cornus spp.), witch-hazel (Hamamelis virginiana), and sassafras (Sassafras albidum). Some date from plant collecting expeditions in the 1920s; others have been added in the past decade.
• Rhododendrons - hybrid azaleas and rhododendrons hardy in Ann Arbor.
• Oak Openings - a collection begun in 2001 and in its early stages. It will represent plants once common to oak openings (also called oak savannas) in the Ann Arbor area.
• Peony Garden - 234 peony cultivars in 27 beds, with plantings dating from 1927.

• Uplands - second and third-growth woodland, mostly oak-hickory forest. The oldest oaks range from 75-119 years old; the oldest hickories are 109-135 years old. This area includes red, black and white oaks (Quercus rubra, Quercus velutina, and Quercus alba); pignut hickory (Carya glabra); Bur oak (Quercus macrocarpa); white ash (Fraxinus americana); basswood (Tilia americana); shagbark hickory (Carya ovata); bitternut hickory (Carya cordiformis); and black walnut (Juglans nigra). Native understory species include ironwood (Ostrya virginiana), musclewood (Carpinus caroliniana), flowering dogwood (Cornus florida), witch-hazel (Hamamelis virginiana), alternate-leaf dogwood (Cornus alternifolia), maple-leaved viburnum (Viburnum acerifolium), and hazelnut (Corylus americana).
• Wetlands - wet meadow and hardwood swamp species, including American elm (Ulmus americana), red ash (Fraxinus pensylvanica), silver maple (Acer saccharinum), and black ash (Fraxinus nigra).

• Matthaei Botanical Gardens
• List of botanical gardens in the United States

• Matthaei Botanical Gardens & Nichols Arboretum

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