United States, Washington, Whitman: Columbia Plateau Ecoregion, Palouse Region: Campus Prairie, Washington State University, Pullman, by WSU golf course. T15N R45E S33 SE4 SE4. Elev. 2600 ft
46.73585°, -117.1406°.

North-facing slope along fenceline in thicket of Crataegus douglasii, Acer campestre, Acer platanoides, and Prunus virginiana. HerbariumSpecimenDuplicate: Acer campestre Shrubs 6 ft tall; samaras at 90 degree angle. Uncommon. https://intermountainbiota.org/portal/collections/individual/index.php?occid=32033836.

U.S.A., Oregon, Washington County: West Slope, 7050 SW Canyon Crest Drive. Elev. 580 ft.
45.50234° N, 122.748486° W
Coordinate Source: Specimen Label.

Seedlings emerging in garden beds, across street from parent tree that is a prolific seeder. Abundant. Shade to partial shade.

U.S.A., Oregon, Multnomah County: Gresham, Gresham City Hall. Field next to employee parking.
45.507447°, -122.43888°. Datum: WGS 84. Georeferenced by Jeffrey Lesh. Coordinate Source: Digital Map.

Edges of mowed field in depression where mowing is difficult. Adventive. Establishing under Populus, with Rubus armeniacus, Hedera. Carpets of seedlings around 6 cm tall and numerous saplings where they escape mowers growing to 2.5 meters tall. Some with fruits. Ornamental plantings close by and likely source. Reproductive state: Fruits. Origin: Introduced.

U.S.A., Oregon, Washington County: West Slope, 7050 SW Canyon Crest Drive. Elev. 580 ft.
45.50234° N, 122.748486° W
Coordinate Source: Specimen Label.

Seedlings growing in flower bed in shade of Acer pseudoplatanus. Mature specimen of Acer campestre, located ca. 75 ft across street, is presumed source of seed. Origin: Introduced.

U.S.A., Oregon, Multnomah County: Portland. Mount Tabor. 20 meters north of Portland Parks and Recreation Tabor Yard facility and below Lincoln Street. Elev. 300 ft.
45.507694°, -122.59641°. Datum: WGS 84. Georeferenced by Dominic Maze. Coordinate Source: Digital Map.

Edge of mixed hardwood and conifer canopy and open area dominated by pasture grasses. Several plants of various age classes. Reproductive state: Fruits. Origin: Introduced.

U.S.A., Oregon, Clackamas County: Canby, W side of Molalla River, S of S Knights Bridge Road.
45.265166° N, 122.710991° W
Coordinate Source: Specimen Label.

Adventive in unmanaged riparian zone of Molalla River at Knightsbridge Park. Overstory of Acer macrophyllum, Populus trichocarpa. Abundant saplings and mature trees to 20 feet tall. Reproductive state: Fruits.

United States, Oregon, Clackamas: Unmanaged riparian zone of Molalla River at Knightsbridge Park; Canby.
45.265166°, -122.71099°. Datum: WGS_1984.

Adventive in unmanaged riparian zone of Molalla River at Knightsbridge Park; abundant saplings and mature trees to 20 feet tall; overstory of Acer macrophyllum, Populus trichocarpa. Acer macrophyllum, Populus trichocarpa Adventive; abundant saplings and mature trees to 20 feet tall. https://oregonflora.org/collections/individual/index.php?occid=6078439. Origin: wild collection.

Canada, British Columbia: Vancouver, Pacific Spirit Park. Elev. 75 m
49.25°, -123.2°.

Solitary tree near edge of mixed woodland. Mature tree; houses nearby; possibly planted long ago, or spread from nearby plantings.

Canada, British Columbia: Greater Vancouver, Burnaby, Burnaby Lake, southwest side, 1 km due southeast of rowing dock. Elev. 15 m
49.239722°, -122.95°.

Moist lakeshore at edge of sparsely wooded thicket, above muck hole, with Betula papyrifera, Malus fusca. Big old moss-covered tree, ca. 2 m in circumference at 5 m above ground; scattered trees naturalized along lakeside path in deciduous woods and more open swampy places.

U.S.A., Oregon, Washington County: West Slope, 7050 SW Canyon Crest Drive. Elev. 590 ft.
T01S, R01E, NE4 NE4 Sec 12.
45.502489°, -122.74841°. Datum: WGS 84. Georeferenced by John Christy. Coordinate Source: Digital Map.

Winter-hardy seedlings established in flower bed, across street from 30-40 ft tall parent tree bearing viable seed. Reproductive state: Vegetative.

Canada, British Columbia: Fraser Valley, south of Agassiz, Rosedale Ferry Road, 500 m west of Agassiz Bridge. Elev. 17 m
49.2025°, -121.78416°.

Alluvial woods. Several trees of various ages naturalized along road in rather dense deciduous woods; sample from tree 30 cm diameter at 1 m above ground.

Germany: "Bishop\'s Hill", Freising.

Landscape tree. Reproductive state: Vegetative. Origin: Native.

U.S.A., Washington, King County: Near Pacific Street, campus of University of Washington, Seattle. Elev. 98 ft.
T25N R4E S16
47.6551°, -122.2973°. Datum: NAD 27. Coordinate uncertainty: 805 meters. Georeferenced by Ben Legler. Coordinate Source: TRS2LL.

Seedlings, self-sown, up to 1 meter tall, in irrigated garden beds, near cultivated parent trees. Reproductive state: Vegetative. Origin: Introduced.

United States, Oregon: Multnomah County, Portland, campus of Reed College, near southeast Woodstock Blvd. Elev. 30 m

In Ligustrum hedge, cultivated fruiting trees ca 70 m distant. Rare, self-sown weed.

Switzerland, Kanton Zurich: Wetzikon Elev. 570 m.

North-west facing edge of planted coniferous-deciduous forest. Reproductive state: Vegetative.

United States, Illinois: Morton Arboretum, Lisle, p-24/35-10 in cornales collection.

Plant acc.# z-u;original source unknown but possibly 531-38; see specimen for more information.

United States, Illinois: Morton Arboretum, Lisle, f-63/05-65 on frost hill.

Acc.no.531-38 sd from kirov academy;cone-shaped low branching tree; 40-45 ft.tall x 40 ft.wide,in good condition;trunk bark fissured, fruit color green.

Canada, British Columbia, Lower Mainland: Agassiz: Park between the business road and railroad.
49.233333°, -121.76666°.

Conservation Status:CDC: Not Listed.

United States, Georgia: Founders garden, univ. of georgia, athens, clarke County.

Poland: Ciesyn, subcarpatica.

Mons tul inter agros et prata ad declive orientale. Ab instituto botanico academiae scientiarum polonae edita.

United States, Ohio: Health services building, ohio state University, Columbus.

Ex. hort.

United States, District of Columbia: US National Arboretum, Washington.

Ex. hort; source w.flemmer\'s sons nursery, princeton, n.j. N.a. 2855, tree about 10 feet tall.

Netherlands: Belmonte Arboretum, wageningen.

Ex. hort #10933. Tree; d.b.h. 12 cm.; height 5 m.

Netherlands: Belmonte Arboretum, wageningen.

Ex. hort # 11461. Tree; d.b.h. 12 cm. height 4 m.

Netherlands: Belmonte Arboretum, wageningen.

Ex. hort. #17863. Tree; d.b.h. 8 cm; height 5 m.

Netherlands: Hort Bot., (De Dreijen), Wageningen.

Ex. hort #1766. Low branched tree, height 5 m, with a somewhat flattened globose head.

Canada, British Columbia: Research station, Agassiz.
49°, -121°. Misleading coordinates given only to nearest degree.

Ex. hort. (#176) Tree; d.b.h. 9 inches; height 25 feet.

U.S.A., Washington, Pierce County: Tacoma. Lincoln Park.

Reproductive state: Flowers.

Canada, British Columbia: D. e. south Agassiz.
49°, -121°. Misleading coordinates given only to nearest degree.

Ex. hort. #63. Tree 50 feet tall with d.b.h. 24 inches.

United Kingdom: Nonsuch park, cheam.

Tree 9 - 15 m tall.

Canada, British Columbia: Dominion experimental station, Agassiz.
49°, -121°. Misleading coordinates given only to nearest degree.

Ex. hort. Tree, 40 feet tall with a d.b.h. of 2 feet.

Canada, British Columbia: Dom. experimental farm , Saanichton, Vancouver Island.

Ex. hort (#4871)

Russia: Dzwinograd.

Ad declive abruptum sinistrum vallis fluminis tyrae/dniestr/; una cum Quercus robore. Instituti botanici academiae scientiarum polonae - cracoviae.

France, Normandy, Seine-Maritime: Forêt-des-Essarts, near Rouen.

https://intermountainbiota.org/portal/collections/individual/index.php?occid=32246672. Reproductive state: Fruiting.

United Kingdom: VC 41, near Rodyr, Glamorgan.

In woods.

United States, Oregon, Multnomah: Portland.
45.52361°, -122.675°. Datum: WGS84.

https://intermountainbiota.org/portal/collections/individual/index.php?occid=30826054. Reproductive state: fruiting.

United States, Oregon, Multnomah: Portland.
45.52361°, -122.675°.

https://intermountainbiota.org/portal/collections/individual/index.php?occid=30826055. Reproductive state: fruiting.

Germany: Kelbra.

Sweden: Helsingborg, "Pelalierna".
56.05°, 12.7°. Datum: WGS84. Georeferenced by Fertig. Coordinate Source: GeoLocate.

In dumetis cum Corylo, Crataego, Pruno spinosa, etc. [in the meadows with Corylus, Crataegus and Prunus spinosa]. https://intermountainbiota.org/portal/collections/individual/index.php?occid=32246624. Reproductive state: Fruiting.

United States, New York: Fiske-McGraw Grounds.

Flowering: May 27; Fruiting June 2. https://intermountainbiota.org/portal/collections/individual/index.php?occid=32246661. Reproductive state: Flowering and Fruiting.

Denmark: Sjaelland: Jagersborg Dyrehave.

https://intermountainbiota.org/portal/collections/individual/index.php?occid=32246668. Reproductive state: Flowering.

Scandinavia: Svedahla, in nauerbacken and brennemolla par., sc. med. -austr.

Czech Republic: Hlubocep bei grouy ?

: (locality not given).

Conservation Status:CDC: Not Listed.

? Unknown: (locality not given).

? Unknown: (locality not given).

? Unknown: (locality not given).

? Unknown: (locality not given).

? Unknown: (locality not given).

? Unknown: (locality not given).