| 0 | Ames 35924 | AS/FN/2022/073/204 | Fraxinus nigra Marshall | Wisconsin, United States | NC7 |  | | 2022 | COLLECTED | 09/29/2022 | Chequamegon National Forest, approximately 4.5 miles south-southeast of Clam Lake along County Highway GG and adjacent Forest Service roads, T42N R4W Sec. 21. | 46.10020200, -90.87459600 | 431 | Wet to saturated soils in northern hardwood forest. | Wild material | | 2139687 | Ames 35924 |
| 1 | Ames 35919 | AS/VO/2022/066/197 | Viburnum opulus L. var. americanum Aiton | Iowa, United States | NC7 |  | | 2022 | COLLECTED | 09/22/2022 | Collected from two locations (13.5 miles apart): North Bear Creek Wildlife Management Area located 1.80 miles east of Highlandville along South Bear Creek (one plant sampled) and Bluffton Fir Stand State Preserve located 9.00 miles northwest of Decorah along Upper Iowa River (two plants sampled), T100N R7W NW ¼ Sec. 35 and T99N R9W SW ¼ Sec. 10, respectively. | 43.43762000, -91.63512800 | 266 | Steep, rocky slopes and cliffs above river. | Wild material | Formerly known as Viburnum trilobum, American highbush cranberry (V. opulus var. americanum) is a North American native shrub that is utilized as an important ornamental and conservation plant that is also harvested as a minor fruit crop (jams/jellies). In nature, this variety is generally found in moist habitats typically along stream banks and swamps where ample moisture is readily available. The native range of V. opulus var. americanum is concentrated in the northeastern United States and into Canada (Little, E. L. Jr. 1977). Attractive ornamental characteristics includes showy lacecap flowers in spring and bright red fruits and foliage in the fall. Fruits are tart with a hint of sweetness. The European highbush cranberry (V. opulus var. opulus) is nearly identical to American highbush cranberry other than small glands (<1 mm) on the petiole making the exact determination very challenging resulting in common misidentifications. A major difference between the American and European highbush cranberries is that the European variety produces unpalatable fruit. Recent research has shown that American and European highbush cranberries are genetically distinct and that plants of hybrid origin are uncommon (Tork et al. 2025). Vigorous early spring growth and good tolerance to late spring frosts. Genetic analysis from Tork et al. 2025 confirmed that genetics of this accession represents American highbush Cranberry (Viburnum opulus var. americanum). This accession represents genetics from northeast Iowa and thus the extreme western edge of the species native range. | 2139681 | Ames 35919 |
| 2 | Ames 35649 | Backbone | Pinus strobus L. | Iowa, United States | NC7 |  | | 2021 | COLLECTED | 03/04/2021 | Backbone State Park located approximately 5.15 miles south, southwest of Strawberry Point, T90N R6W NW1/4 Sec. 16 | 42.61131500, -91.56098900 | 316 | Cliff edges and steep slopes above the Maquoketa River, including the ridge known as the "Backbone". | Wild material | The native range of Pinus strobus is concentrated in the northeastern United States extending south into the northern edge of Georgia and west to central Minnesota. In Iowa, there are scattered populations in a few northeastern counties and also a very small disjunct population in central Iowa (Hardin County, Ames 32758) and also one in southeastern Iowa (Muscatine County, Ames 35635). This accession represents genetics from "legacy" specimens from northeastern Iowa in Backbone State Park (Delaware County). Although a significant number of P. strobus were planted at this park in the 1920's a significant number of native specimens still exist throughout the park typically found on extreme topographical features such as steep slopes and rock outcroppings. Genetics from this site likely represents the extreme southwestern edge of the species native range. Genetics may likely be adapted/tolerant to drought and also late winter/early spring extreme temperature fluctuations. Accession was collected as scions in winter to capture genetics that are of known origin. | 2113351 | Ames 35649 |
| 3 | Ames 35650 | Bixby | Pinus strobus L. | Iowa, United States | NC7 |  | | 2021 | COLLECTED | 03/04/2021 | Bixby State Preserve on slopes above Bear Creek, located approximately 6.25 miles east of Strawberry Point, T91N R5W SE1/4 Sec. 22 | 42.67534800, -91.41301000 | 324 | Cliff edges and steep slopes. | Wild material | The native range of Pinus strobus is concentrated in the northeastern United States extending south into the northern edge of Georgia and west to central Minnesota. In Iowa, there are scattered populations in a few northeastern counties and also a very small disjunct population in central Iowa (Hardin County, Ames 32758) and also one in southeastern Iowa (Muscatine County, Ames 35635). This accession represents genetics from "legacy" specimens from northeastern Iowa in Bixby State Preserve (Clayton County). Genetics from this site likely represents the extreme southwestern edge of the species native range. Genetics may likely be adapted/tolerant to drought and also late winter/early spring extreme temperature fluctuations. Accession was collected as scions in winter to capture genetics that are of known origin. | 2113352 | Ames 35650 |
| 4 | Ames 33357 | JDC/UT/2016/018/733 | Ulmus thomasii Sarg. | Iowa, United States | NC7 |  | | 2016 | COLLECTED | 06/03/2016 | Malanaphy Springs State Preserve just northwest of Decorah, T99N R8W SW ¼ NW ¼ SE ¼ Sec. 31 | 43.34713800, -91.83840000 | 302 | Deciduous woods. Rocky substrate. 20 degree northwest-facing slope | Wild material | Ulmus thomasii (Rock elm) is an underutilized tree species both in conservation and in the urban landscape. Charles Sprague Sargent (first director of the Arnold Arboretum of Harvard University, Boston, MA) described the wood of Rock Elm as "heavy, hard, very strong and tough, closely grained, and susceptible of receiving a beautiful polish". Historically noted for a variety of uses in woodworking including furniture, heavy agricultural implements, timber frame buildings, pianos, hockey sticks, and hand tools. U. thomasii is extremely drought tolerant, adaptable to very calcareous soils, and compared to U. americana or U. rubra has a very conservative growth rate requiring minimal attention in regards to pruning. Rock elm naturally tends to develop into a nice structural specimen in the landscape, unlike other fast growing U. americana cultivars in the nursery trade needing frequent attention. Rock elm has very fissured bark and is well known for maintaining a strong central leader resulting in a very attractive, pyramidal form. Despite many literature sources stating that "wings" on the stems are a key identifiying characteristic, this trait is not reliable and many genotypes may completely lack "wings" on the stems. While growth habit and morphology of dormant buds (very pointy) are good traits to help aid in identification, fruits are the best way to confirm identity. Fruits are densly pubescent, often described as "inflated" and generally reach maturity a couple weeks after U. rubra and U. americana. U. thomasii flowering in central Iowa typically occurs the last week in April into the first week in May and are rather distinguishable from other Ulmus in being pendulous. Fruits are extremely prized treats for many birds, where fruits are often "robbed" prior to full maturity. Fruits are also highly prized by many other animals such as mice, squirrels, chipmunks, turkeys, etc. and are generally consumed within hours after fruit abscission. The native range of U. thomasii is concentrated in the northeastern United States and into Canada with disjunct populations documented in northwestern Missouri and northwestern Arkansas (Little, E. L. Jr. 1971). In the 1895 Silva of North America (vol. 7) it was stated that, “The value of the wood of the Rock Elm threatens its extinction and most of the large trees have already been cut.” Today, since rock elm is rather rare, especially in areas near the edges of its range, many states list the species as endangered or threatened warranting preservation efforts. This accession represents genetics from northeast Iowa (Winneshiek County). In an assessment of some of the largest Ulmus thomasii (native and cultivated) across Iowa, four of the nine largest specimens in Iowa are present in Malanaphy Springs State Preserve where this accession was sampled. The second largest U. thomasii in the state located in Malanaphy Springs was measured on 22 May 2020 with a circumference of 6.42', height of 86.58', and an average crown spread of 68.00' (180 points) (Rouw, M., personal communication, 8 February 2021). | 1940580 | Ames 33357 |
| 5 | Ames 32963 | JDC/BA/2015/049/706 | Betula alleghaniensis Britton | Iowa, United States | NC7 | | | 2015 | COLLECTED | 09/14/2015 | Bixby State Preserve, T91N R5W extreme southern edge of Sec. 23 basically restricted to W 1/2 of Sec. 23. | 42.67470300, -91.39917300 | 308 | North-facing algific talus slope (45-60 degrees) adjacent to Bear Creek. Moist deciduous woods. Growing in association with Diervilla lonicera, Hamamelis virginiana, Corylus sp., Viburnum opulus var. americanum, Cornus rugosa (few), Cornus alternifolia, Fraxinus nigra, Quercus rubra, Viburnum lentago, Ribes sp., Rubus idaeus subsp. strigosus, Rhamnus alnifolia (few), Rosa sp., Taxus canadensis, Prunus virginiana, Impatiens sp., Dirca palustris, and Pinus strobus (few). | Wild material | | 1927433 | Ames 32963 |
| 6 | Ames 32965 | JDC/BA/2015/051/708 | Betula alleghaniensis Britton | Iowa, United States | NC7 | | | 2015 | COLLECTED | 09/15/2015 | Yellow River State Forest, T97N R4W northern edge of SW 1/4 NW 1/4 Sec. 36 | 43.17782100, -91.26584600 | 227 | North-facing algific talus slope (45-60 degrees) adjacent to Paint Creek. Moist deciduous woods. Growing in association with Fraxinus nigra, Staphylea trifolia, Carpinus caroliniana, Quercus rubra, Acer saccharum, Cornus alternifolia, Amelanchier arborea, Ostrya virginiana, Viburnum opulus var. americanum, Cornus rugosa, Cornus alternifolia, Zanthoxylum americanum, Viburnum rafinesqueanum, Cypripedium pubescens, Ribes sp.,Corylus sp., Juniperus virginiana, Dirca palustris, Ulmus thomasii, Prunella vulgaris, Diervilla lonicera, Quercus macrocarpa, Carya cordiformis, Taxus canadensis, Tilia americana, Adiantum pedatum, and Aconitum noveboracense. | Wild material | | 1927435 | Ames 32965 |
| 7 | Ames 32966 | JDC/VA/2015/052/709 | Viburnum opulus L. var. americanum Aiton | Iowa, United States | NC7 |  | | 2015 | COLLECTED | 09/15/2015 | Yellow River State Forest, T97N R4W northern edge of SW ¼ NW ¼ Sec. 36. | 43.17778200, -91.26642800 | 239 | North-facing algific talus slope (45-60 degrees) adjacent to Paint Creek. Moist deciduous woods. | Wild material | Formerly known as Viburnum trilobum, American highbush cranberry (V. opulus var. americanum) is a North American native shrub that is utilized as an important ornamental and conservation plant that is also harvested as a minor fruit crop (jams/jellies). In nature, this variety is generally found in moist habitats typically along stream banks and swamps where ample moisture is readily available. The native range of V. opulus var. americana is concentrated in the northeastern United States and into Canada (Little, E. L. Jr. 1977). Attractive ornamental characteristics includes showy lacecap flowers in spring and bright red fruits and foliage in the fall. Fruits are tart with a hint of sweetness. The European highbush cranberry (V. opulus var. opulus) is nearly identical to American highbush cranberry other than small glands (<1 mm) on the petiole making the exact determination very challenging resulting in common misidentifications. A major difference between the American and European highbush cranberries is that the European variety produces unpalatable fruit. Recent research has shown that American and European highbush cranberries are genetically distinct and that plants of hybrid origin are uncommon (Tork et al. 2025). Vigorous early spring growth and good tolerance to late spring frosts. Genetic analysis from Tork et al. 2025 confirmed that genetics of this accession represents American highbush Cranberry (Viburnum opulus var. americanum). This accession represents genetics from northeast Iowa and thus the extreme western edge of the species native range. | 1927436 | Ames 32966 |
| 8 | Ames 32822 | JDC/DL/2014/139/642 | Diervilla lonicera Mill. | Iowa, United States | NC7 |  | | 2014 | COLLECTED | 10/28/2014 | Clayton Road (C17) approximately 0.25 mile west of Kestrel Road, 1.50 miles east of Garnavillo on a steep north-facing slope T93N R3W near center of NW 1/4 Sec. 16 and also at the end of 250th Street approximatley 2.25 miles east of Garnavillo on a steep north, northwest-facing slope of Buck Creek watershed T93N R3W SE 1/4 SE 1/4 SE 1/4 Sec. 16 | 42.87344100, -91.20649600 | 264 | | Wild material | | 1921782 | Ames 32822 |
| 9 | Ames 32824 | JDC/DL/2014/142/645 | Diervilla lonicera Mill. | Iowa, United States | NC7 |  | | 2014 | COLLECTED | 10/29/2014 | Backbone State Park located approximately 4.60 miles south southwest of Strawberry Point, T90N R6W NE 1/4 Sec. 16. | 42.61091600, -91.55377200 | 322 | Steep north-facing slope. | Wild material | | 1921784 | Ames 32824 |
| 10 | Ames 32825 | JDC/DL/2014/145/648 | Diervilla lonicera Mill. | Iowa, United States | NC7 |  | | 2014 | COLLECTED | 10/29/2014 | Bixby State Park located approximately 2.25 miles north of Edgewood, T91N R5W SE 1/4 SE 1/4 SW 1/4 Sec. 23 | 42.67442600, -91.39783400 | 323 | Moist woods, north-facing (45 degres) slope. | Wild material | | 1921785 | Ames 32825 |
| 11 | Ames 32763 | JDC/DL/2014/041/543 | Diervilla lonicera Mill. | Iowa, United States | NC7 |  | | 2014 | COLLECTED | 09/03/2014 | Bluffton Fir State Preserve near Bluffton, T99N R9W SW 1/4 SW 1/4 Sec. 10 | 43.40068700, -91.90760900 | 346 | High quality, native woods. Steep slope, northwest-facing. | Wild material | | 1921311 | Ames 32763 |
| 12 | Ames 31516 | JDC/CR/2012/014/407 | Cornus rugosa Lam. | Iowa, United States | NC7 |  | | 2012 | COLLECTED | 07/13/2012 | Bluffton Fir State Preserve, SW 1/4 of Section 10, T99N, R9W, Bluffton Quad, near Bluffton, Winneshiek County. | 43.41080200, -91.93845200 | 343 | Mixed hardwood forest. Very steep, northwest-facing slope. | Wild material | | 1903743 | Ames 31516 |
| 13 | Ames 31518 | JDC/DL/2012/018/411 | Diervilla lonicera Mill. | Iowa, United States | NC7 |  | | 2012 | COLLECTED | 07/14/2012 | Edge of Echo Valley State Park just southeast of West Union, T94N R8W NE 1/4 NE 1/4 SW 1/4 West Union Quad Sec. 22 | 42.94188100, -91.77707300 | 334 | Mixed hardwood forest. Very steep, northeast-facing slopes. | Wild material | | 1903745 | Ames 31518 |