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JP <br />Photo 6. Mature "buckthorn forest" in floodplain. Sca an se barberry <br />FF -3 (approximately 6.73 acres) <br />The FF -3 subunit begins to the east of the separatin from FF -2. This <br />subunit is considerably lower in elevation n is ro hly level with the <br />riverbank as well as the farm field. This is d on le aerial photos by the darker <br />areas in the field, which signal seasonally sta wate F-3 is a narrow unit that snakes <br />alongside the Elk River. Mov' east thr h the unit, the floodplain area narrows <br />considerably as the river es q close the Id edge. A very large cottonwood (too <br />large to measure with idard d i tape) is p ent in this narrow area and is purported <br />to be the largest in Sher Co a unit, a row of box elder (-20 cm dbh), <br />prickly ash and buckthorn a farm fie edge. In the larger floodplain forest area, large <br />green ash (5-5 h] an maple (:581.3 cm dbh) make up the majority of the <br />canopy, tho sca meric are present (11-24.9 cm dbh) (Photo 7). The <br />understo Is a mix of nettle earweed, and other native species, though large <br />patche ddy bare gr id dominate. Because of the seasonally standing water in this <br />unit, many have littl no buckthorn. However, buckthorn is present along the farm <br />field and is so at de a at the eastern end, where the subunit widens again as it <br />approaches the c e of the Elk and Mississippi rivers. This eastern section of the <br />subunit is higher in vation than the rest of the subunit, and dominated by green ash <br />(:559.7 cm dbh), wit some hackberry (_::38.4 cm dbh) and smaller American elm (-16.0 cm <br />dbh) (Photo 8). Creeping Charlie is the dominant understory species in this area, which <br />grades into the larger FF -4 to the east and south. <br />Friends of the Mississippi W.H. Houlton Conservation Area NRMP <br />