BETULACEAE (Birch family)
Alnus incana (L.) Moench ssp. rugosa (Du Roi) Clausen speckled alder [US; Minnesota; Itasca County; Swan River; T53N, R22W, S31; 1,255 feet][old county road heading north from County Rd. #428, 4.75 miles south from Highway 2 (Swan River); June 1, 1997; Collected & identified by Chuck Walker; #MN07]
Alnus oblongifolia Torr. Arizona alder [US; Arizona; Greenlee County; T2S, R28E, S10; 5,800 feet][upper campground, Juan Miller Campgrounds; May 22, 1996; Collected & identified by Chuck Walker; #AZ295]
Alnus rubra Bong. red alder [US; California; Humboldt County; T11N, R1E, S35; 41 deg. 17.734'N, 124 deg. 2.022'W; 40 feet][on perimeter of parking lot at Redwood Creek Trailhead, east side of Highway #101, about two miles northeast of Orick; April 14, 2005; Collected & identified by Chuck Walker; #CA167]
Alnus serrulata (Ait.) Willd. hazel alder [US; Illinois; Pope County; T11S, R6E; 550 feet][August 30, 2002; Collected & identified by Chuck Walker; #IL427]
Betula nigra L. river birch [US; Illinois; Jackson County; Carbondale; T9S, R1W, S28; 420 feet] [20 m southeast of Logan Dr.-Washington St. intersection, Southern Illinois University; June 29, 2001; Collected & identified by Chuck Walker; #IL185]
Betula papyrifera Marsh. paper birch [US; Minnesota; St Louis County, Cherry; T57N, R19W, S26; 1,350 feet][vacant lot next to home at 3853 Highway 25, 1/4 mile south of Highway 37; June 3, 1997; Collected & identified by Chuck Walker; #MN17]
Betula pendula Roth European white birch [US; Illinois; Jackson County; Carbondale; T9S, R1W, S28; 450 feet][southeast corner of Student Center, Southern Illinois University; June 8, 2001; Collected & identified by Chuck Walker; #IL163]
Carpinus caroliniana Walt. ssp. caroliniana American hornbeam [US; Illinois; Jackson County; T9S, R1W, S35; 37 deg. 37.656'N, 89 deg. 9.94'W; 565 feet][in woods on the west side of the Giant City Road, northwest of Indian Creek (Creek passes under road); June 17, 2002; Collected by Chuck Walker; Identified by Dr. Mark A. Basinger; #IL309]
Carpinus caroliniana Walt. ssp. caroliniana American hornbeam [US; Mississippi; Webster County; T21N, R2E, S27; 33 deg. 39.198'N, 89 deg. 4.353'W; 320 feet][Line Creek pull-off, Natchez Trace; April 28, 2007; Collected by Chuck Walker; Identified by Dr. Nathan Schiff & Chuck Walker; #MS123]
Corylus americana Walt. American hazelnut [US; Illinois; Calhoun County; Brussels; T13S, R1W, S16; 440 feet][hedge on east side of Two Rivers National Wildlife Refuge Office; August 1, 2000; Collected & identified by Chuck Walker; #IL51]
Ostrya virginiana (P. Mill.) K. Koch var. virginiana hophornbeam [US; Iowa; Fremont County; T68N, R42W, S29; 1,200 feet][south side of road leading to lower picnic area, 20 m from Park Office, Waubonsie State Park; June 22, 1999; Collected & identified by Chuck Walker; #IA26]