| 0 | PI 664881 | 6 | Prunella vulgaris L. | Iowa, United States | NC7 | | | 2006 | COLLECTED | 10/02/2006 | Near the east end of Reindeer Ridge, Ledges State Park, NE 1/4 of NE 1/4 of NW 1/4 of Section 21, T83N, R26W, Worth Township, Boone County. | 41.99388889, -93.88444444 | 329 | Large slump below sandstone cliff outcrop. Few feet up from Pea's creek floodplain. Partial sun. Northwest facing. Moist-wet clay soil. | Wild material | Plants 12 inches tall. | 1712926 | PI 664881 |
| 1 | PI 664882 | 9 | Prunella vulgaris L. | Iowa, United States | NC7 | | | 2006 | COLLECTED | 09/22/2006 | 300 yards south of Carl Fritz Henning Shelter House, 300 yards northeast of Lost Lake parking lot, Lower Ledges Road, Ledges State Park, NW 1/4 of NE 1/4 of SW 1/4 of Section 21, T83N, R26W, Worth Township, Boone County. | 41.98555556, -93.88833333 | 329 | Cleared woods for powerline right-of-way. Moist-wet mostly clay soil. Plants scattered over entire hilltops. Site approximately 250 yards by 30 feet. | Wild material | Plants 16-18 inches tall. | 1712928 | PI 664882 |
| 2 | PI 664883 | 10 | Prunella vulgaris L. | Iowa, United States | NC7 | | | 2006 | COLLECTED | 09/15/2006 | Downhill, east-southeast of primitive campground parking lot, Ledges State Park, NE 1/4 of SW 1/4 of SW 1/4 of Section 15, T83N, R26W, Worth Township, Boone County. | 41.99638889, -93.87111111 | 329 | 3-4 small springs at bottom of west facing hillside and clay slump on west side of a deep gulley. Dense woods. Very wet soil. | Wild material | Plants up to 11 inches tall. | 1712929 | PI 664883 |
| 3 | PI 656805 | 001 | Cornus alternifolia L. f. | Iowa, United States | NC7 |  | | 2005 | COLLECTED | 07/14/2005 | Ledges State Park, Boone County. | 41.99666667, -93.88166667 | 328 | Mostly shaded, exposed over rock cliffs, next to small creek. 55% slope with a northern aspect. Well drained soil, predominately rock substrate. | Wild material | Plants 6-10 feet in height, clean foliage, some canker. | 1685173 | PI 656805 |
| 4 | PI 656820 | Ames 27186 | Physocarpus opulifolius (L.) Maxim. | Iowa, United States | NC7 |  | | 2003 | COLLECTED | 08/24/2003 | Along Old Indian Trail, overlooking Pease Creek, Ledges State Park, S 1/2 of SE 1/4 of SW 1/4 of Section 16, T83N, R26W, Madrid NW Quad, Boone County. | 41.99500000, -93.88583333 | 289 | Sandstone ridge. | Wild material | Shrubs to 2 meters tall. | 1648564 | PI 656820 |
| 5 | Ames 36073 | JDC/UT/2022/028/1009 | Ulmus thomasii Sarg. | Iowa, United States | NC7 |  | | 2023 | COLLECTED | 06/05/2023 | Ledges State Park approximately 4.75 miles south of Boone, T83N R26W (Madrid NW Quad.) near center of SE ¼ Sec. 16 and also NW ¼ SW ¼ Sec. 21. | 41.99780200, -93.87967900 | 288 | Moist deciduous woods typically on mid-slopes to base of slopes and also well-drained floodplains. | 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. Genetics of this accession would be representative of the species southwestern edge of its native range. Out of approximately 100 specimens noted throughout Ledges State Park only 1-2% of specimens had characteristic "wings" on the stems. Research was executed (Moore, P., 2024) involving the core sampling of U. thomasii and U. americana specimens in Ledges State Park to make growth ring widths and basal area increment comparisons. Results determined that the average age of cored trees U. thomasii (n=4) and U. americana (n=4) of both species was roughly 80 years, excluding the exceptional case of tree #007 (Ames 36073 23ncao02 SD). Tree #007 was aged at 300 years of age and currently (2025) ranks as the 14th largest U. thomasii in Iowa measuring 21" DBH with a height of 75' 5" and a spread of 43' 5" totalling 152.21 points (Rouw, M., personal communication, 4 May 2022). The computed mean density at 𝑀𝑀 = 12% for U. thomasii was 0.80 g/cm3, and for U. americana was 0.672 g/cm3. These values are both higher than the representative values inferred from the Woods Database which are 0.755 g/cm3 for U. thomasii and 0.56 g/cm3 for U. americana. To date, there is little to no information regarding U. thomasii resistance to Dutch Elm Disease. Collections of U. thomasii at the Arnold Arboretum have over-time succumbed to DED (Pruka, B., 2016). However, data recorded by Moore (2024) indicates that U. thomasii growing in central Iowa can surpass 300 years in age verifying it's long-term utilization in the landscape. | 2142915 | Ames 36073 |
| 6 | Ames 35996 | AS/QR/2022/067/199 | Quercus rubra L. | Iowa, United States | | | Historic | 2022 | COLLECTED | 09/27/2022 | Ledges State Park, approximately 4.5 miles south of Boone, T83N R26W Sec. 20 | 41.99504700, -93.88304400 | 330 | Hardwood forest. | Wild material | | 2141429 | Ames 35996 |
| 7 | Ames 35734 | Ledges State Park | Teucrium canadense L. | Iowa, United States | NC7 |  | | 2021 | COLLECTED | 08/23/2021 | Ledges State Park located approximately 4.75 miles south of Boone T83N R26W Sec. 16 & 21 | 41.99262400, -93.87724800 | 330 | Edges of woods | Wild material | | 2120338 | Ames 35734 |
| 8 | WLP 1685 | JDC/RS/2019/036/915 | Rosa setigera Michx. | Iowa, United States | NA |  | | 2019 | COLLECTED | 10/17/2019 | Ledges State Park located approximately 4.75 miles south of Boone, just south of the Oakwoods Shelter/Picnic area, T83N R26W NE1/4 NE1/4 and also NW1/4 NE1/4 Sec. 21, Boone County | 41.99262400, -93.87724800 | 330 | Edges of woods (adjacent to prairie) and also within 20-25 yards from woods in prairie. Noted in east, west, and south-facing edges of woods (no specimens noted on north-facing woodland edges) | Wild material | Woody shrub/vine stretching up to 12' in length. Alternate compound leaves usually consisting of five lealets. Leaf rachis and stipule margins glandular. Mature hypanthium and pedicel with stipitate glandular hairs. Mature hypanthium mostly bright to dark red in color with a few dark orange noted at time of harvest (17 October 2019). Leaves rather to somewhat glossy. This collection represents genetics from the northwestern edge of the species range, likely suggesting good cold-hardiness (USDA Zone 5a). | 2097769 | WLP 1685 |
| 9 | Ames 35228 | JDC/AS/2019/031/910 | Agastache scrophulariifolia (Willd.) Kuntze | Iowa, United States | NC7 |  | | 2019 | COLLECTED | 09/30/2019 | Ledges State Park located approximately 4.75 miles south of Boone, just east and south of the Carl Fritz Henning Shelter, T83N R26W SW1/4 SE1/4 NW1/4 Sec. 21, Boone County | 41.98786200, -93.88824500 | 276 | Moist, semi-shaded, deciduous woods. Recently disturbed. | Wild material | Plants measuring approximately 6-8' in height with 4-5" spikes rather white or extremely pale pink in color. Peak flowering occurred circa 26 August 2019 in nature. | 2097764 | Ames 35228 |
| 10 | Ames 32093 | JDC/CC/2013/048/492 | Carpinus caroliniana Walter | Iowa, United States | NC7 | | | 2013 | COLLECTED | 10/25/2013 | Ledges State Park mostly from specimens adjacent to Peas Creek, NE ¼ of SE ¼ of Sec. 16, T83N R26W, Des Moines Quad. | 41.99910000, -93.87880000 | 328 | North and northwest-facing slopes. | Wild material | The native range of Carpinus caroliniana is concentrated in the eastern half of the U.S. with a very small disjunct population in central Iowa (Little, 1971). This accession represents a collection of C. caroliniana germplasm from the extreme western edge of the species native range, specifically the central Iowa disjunct population at Ledges State Park. The next closest occurrence is in eastern Iowa (100-150 miles). As of 2025, one specimen at Ledges State Park (McCoy Wildlife Area) currently represents the state of Iowa's largest C. caroliniana specimen measuring 6.68" DBH, 41.67’ in height, and 23.75’ average crown spread for a total of 68.608 points (Rouw, M., personal communication, 4 May 2022). This accession does include genotypes that do tend to sucker/form clonal colonies. Fall color (red/orange) tends to peak in the last week of October (central Iowa) with peak fruiting occurring simultaneously. Bark smooth, grey. | 1914037 | Ames 32093 |
| 11 | Ames 31515 | Duplicate of Ames 36172 | Cornus rugosa Lam. | Iowa, United States | | | Historic | 2012 | COLLECTED | 07/12/2012 | Ledges State Park, NE 1/4 of NW 1/4 of Section 21, T83N, R26W, Madrid NW Quad, near Boone, Boone County. | 41.99377000, -93.88624000 | 328 | Mixed hardwood forest. Edges of bluffs. North-facing slopes. | Wild material | | 1903742 | Ames 31515 |
| 12 | Ames 31256 | APS/GD/2008/005/005 | Gymnocladus dioicus (L.) K. Koch | Iowa, United States | NC7 |  | | 2012 | COLLECTED | 01/10/2012 | Ledges State Park, SW 1/4 of SW 1/4 of Section 21, T83N, R26W, Madrid NW Quad, Boone County | 41.98110000, -93.89010000 | 328 | Upland woods. 30% slope with a western aspect. | Wild material | Largest specimen noted was 22" d.b.h. | 1897494 | Ames 31256 |
| 13 | Ames 29614 | JDC/FN/2008/017/087 | Fraxinus nigra Marshall | Iowa, United States | NC7 |  | Not Available | 2008 | COLLECTED | 09/22/2008 | Along Davis Creek (starting at Peas Creek and heading north towards park boundary), Ledges State Park, W 1/2 of Section 16, Boone County. | 42.00222222, -93.88694444 | 289 | Mostly shaded; rock and limestone substrate. Species restricted to banks of creek. | Wild material | Approximately 70+ feet in height and approximately 3 feet DBH. | 1786593 | Ames 29614 |
| 14 | Ames 28350 | 12 | Hypericum majus (A. Gray) Britton | Iowa, United States | NC7 |  | Not Available | 2006 | COLLECTED | 09/15/2006 | East-southeast across a deep gulley from a primitive campground parking lot, Ledges State Park, NE 1/4 of SW 1/4 of SW 1/4 of Section 15, T83N, R26W, Worth Township, Boone County. | 41.99638889, -93.87055556 | 329 | Hilltop savanna. Full sun. Dry (possibly loess) soil. | Wild material | Plants 1-6 inches tall. | 1712920 | Ames 28350 |