| 0 | PI 479427 NA 82431 | JH-40-82 | Hydrangea paniculata Siebold | Hokkaidô, Japan | NA | | | 2015 | COLLECTED | 09/15/1982 | Hokkaido Prefecture, Soya Subprefecture, Teshio-gun (district): Horonobe-cho (town): Toikanbetsu, Hokkaido University Arboretum, Teshio Forest. | 45.00000000, 141.91666667 | | | Wild material | Received as rooted cuttings. This accession (a single clone?) was reacquired through North Central Regional Plant Introduction Station at Ames, Iowa from the University of New Hampshire at Durham, to whom we distributed material in 1985. In 2007, visiting staff from Ames were impressed by its high performance over most other plants of this species and even other genera, and became interested in evaluating it through the NC-7 Regional Woody Ornamental Trials program. Cuttings were sent to Ames in 2008 and 2009, and plants grown from cuttings of the resulting plants were returned to the USNA in 2015. Our last remaining plants of NA 51058 died several years ago but several other accessions from this expedition continue to grow well. | 2191326 | PI 479427 NA 82431 |
| 1 | PI 479427 | WLP 3117 | Hydrangea paniculata Siebold | Hokkaidô, Japan | NC7 |  | | 1982 | COLLECTED | 09/15/1982 | Hokkaido University Arboretum, Teshio Forest, Tolkanbetsu, Horonobe-Cho, Teshio-gun. | 44.88333333, 141.91666667 | | | Cultivated material | Shrub deciduous, 1.5-1.8 meters tall, dense habit. Pubescent branchlets. Leaves short petioled, the oblong to elliptic-ovate blades mostly 4-12 cm long, dark green above, somewhat rugose. Inflorescence a pyramidal cluster to 2.5 dm long. Flowers sterile, white, with rose-pink bracts. Native to China, Korea, and Japan. Probable hardiness to USDA Zone 4. Plants offered result from the 1982 Plant Exploration to Hokkaido and northern Honshu and were grown from seed collected from a plant moved from the wild growing at Hokkaido University Arboretum. Minimum temperature -17 degrees C. Snow cover 1-2 meters per annum. | 1374363 | PI 479427 |
| 2 | PI 479428 NA 51181 | JH-159-82 | Hydrangea paniculata Siebold | Hokkaidô, Japan | NA | | | 1982 | COLLECTED | 09/25/1982 | Hokkaido Prefecture, Kushiro Subprefecture, Kawakami-gun: Teshikaga-cho: Southwest slope of Mt. Iwo. | 43.60000000, 144.43333333 | | Growing in mixed woodland. | Wild material | | 1374364 | PI 479428 NA 51181 |
| 3 | PI 479429 | WLP 3118 | Hydrangea paniculata Siebold | Japan | NA |  | | 1982 | COLLECTED | 09/25/1982 | | 43.60000000, 144.43333333 | | | Wild material | Snow cover 60cm per annum. Minimum temperature -25C. Shrub deciduous, 1.5-1.8m tall, multistemmed from base. Above branches many. Stems brown. Leaves bright green above. Sterile flowers, bracts rose-pink on reverse side when old. Growing in mixed woodland. Seed from several plants. | 1374365 | PI 479429 |
| 4 | PI 479429 NA 51182 | JH-160-82 | Hydrangea paniculata Siebold | Hokkaidô, Japan | NA | | | 1982 | COLLECTED | 09/25/1982 | Hokkaido Prefecture, Kushiro Subprefecture, Kawakami-gun (district): Teshikaga-cho (town): Southwest slope of Mt. Iwo. | 43.60000000, 144.43333333 | | Growing in mixed woodland. | Wild material | | 2191328 | PI 479429 NA 51182 |
| 5 | PI 235134 | NA 15043 | Hydrangea paniculata Siebold | Nagano, Japan | NA | | | 1956 | COLLECTED | | SHIBUYU ONSEN, YATSUGATAKE MOUNTAINS | 36.03133000, 138.33984400 | 1800 | | Wild material | | 1185368 | PI 235134 |
| 6 | NA 69044 | EHOK 033 | Hydrangea paniculata Siebold | Hokkaidô, Japan | NA | | | 1998 | COLLECTED | 09/21/1997 | Uryu Experimental Forest, Horokanai Town, Hokkaido. North Provinance. North of Shumarinai Lake, between Dorokawa River and Putokamaestu River. Forest section 319. | 44.38833333, 142.20666667 | 325 | Mixed deciduous/coniferous forest. South West Aspect. Found on top of roadside embankment. Parent rock welded volcanic tuff, with a soil type of fertile sandy loam. | Wild material | Plant to 1.5m with spread to 1.2m. | 1595126 | NA 69044 |
| 7 | NA 69052 | EHOK 55 | Hydrangea paniculata Siebold | Hokkaidô, Japan | NA | | | 1998 | COLLECTED | 09/23/1997 | Uryu Experimental Forest, Uryu-gun, Horokanai-cho. | 44.20500000, 142.13777778 | 135 | Woodland, Mixed Deciduous/coniferous. West aspect. Parent rock serpentine with soil type fertile sandy loam with clay. East of Uryu river between Soeushinai and Shintome, edge of Forest section 120. | Wild material | Associate plants include: Betula platyphylla var. japonica, Fraxinus mandshurica, Ulmus davidiana var. japonica, Alnus hirsuta and Salix. | 1612157 | NA 69052 |
| 8 | NA 86846 | MSD19-001 | Acer pycnanthum K. Koch | Honshu, Japan | NA | | | 2021 | COLLECTED | 05/23/2019 | Gifu Prefecture: Nakatsugawa: farm of Mr. Asano. | 35.49533000, 137.45438000 | 270 | Mesic woods adjacent rice paddies; much of overstory was Cryptomeria (planted); poor drainage throughout; most trees growing at edges where light was abundant. Soil highly organic and shallow. | Wild material | Full name as recorded at U.S. National Arboretum: Acer pycnanthum. Plants picked up by USNA staff on 6/23/2021. | 2154981 | NA 86846 |
| 9 | NA 86847 | MSD19-002 | Acer pycnanthum K. Koch | Honshu, Japan | NA | | | 2021 | COLLECTED | 05/24/2019 | Nagano Prefecture, Shimoina District; Achii; Bicchuubara, in woods owned by Mrs. Noguchi. | 35.42873000, 137.74935000 | 612 | Mesic forest fed by natural springs and with many small (and old) canals diverting water; large Cryptomeria and Acer pycnanthum comprising much of the canopy; rich understory below. Soil organic and humusy over brown loam. | Wild material | Full name as recorded at U.S. National Arboretum: Acer pycnanthum. Plants picked up by USNA staff on 6/23/2021. | 2154982 | NA 86847 |
| 10 | WLP 326 | MSD19-002 | Acer pycnanthum K. Koch | Honshu, Japan | NA | | | 2019 | COLLECTED | 05/24/2019 | Nagano Prefecture, Shimoina District; Achii; Bicchuubara, in woods owned by Mrs. Noguchi. | 35.42873000, 137.74935000 | 612 | Mesic forest fed by natural springs and with many small (and old) canals diverting water; large Cryptomeria and Acer pycnanthum comprising much of the canopy; rich understory below. Soil organic and humusy over brown loam. | Wild material | See NA 86847 for seedlings of this collection received later from the Morris Arboretum. | 2109075 | WLP 326 |
| 11 | NA 85445 | PCC18-HON-033 | Ilex geniculata Maxim. | Honshu, Japan | NA | | | 2018 | COLLECTED | 09/16/2018 | Tochigi Prefecture, Nikko City; ; Nikko National Park, Lake Yunoko. | 36.80373000, 139.42608000 | 1423 | Mixed deciduous-coniferous forest; edge of lake. Soil consists of boulders with some organic matter. | Wild material | Seed collected from one plant; three herbarium vouchers collected; photographed. | 2108929 | NA 85445 |
| 12 | NA 78350 | BCJMMT 141 | Fagus crenata Blume | Honshu, Japan | NA | | | 2009 | COLLECTED | 10/01/2007 | Niigata Prefecture: Yuzawa-machi: Mt Tairappyo [Mt Matsude?], Mikuni, Yuzawa. [Originally listed as: Mt Matsude, Hiuchi, Yuzawa Town; locality name updated based on GPS coordinates. -SBL] | 38.82053000, 138.80066000 | 1600 | In shade on a moist, rocky, steep, north-facing mountainside of open broadleaf woodland. | Wild material | | 1952274 | NA 78350 |
| 13 | NA 78354 | BCJMMT 279 | Magnolia stellata (Siebold & Zucc.) Maxim. | Honshu, Japan | NA | | | 2009 | COLLECTED | 10/10/2007 | Gifu Prefecture: Sentan-bayashi, Nakatsugawa City. | 35.49253000, 137.45573000 | 355 | Localised in sun on moist medium loam on the edge of a pond close to farmland in the hedgerow with Hydrangea paniculata. | Wild material | | 1951245 | NA 78354 |