1. Illinois Natural History Survey University of Illinois at Urbana‐Champaign 1816 South Oak Street Champaign Illinois 61820 U.S.A.
2. Department of Plant Biology University of Illinois at Urbana‐Champaign 505 South Avenue Urbana Illinois 61801 U.S.A.
3. Kötteritzscher Ring 1 04680 Colditz Germany
4. Senckenberg Museum of Natural History Görlitz PF 300 154 02806 Görlitz Germany
5. Farlow Reference Library and Herbarium, Department of Organismic and Evolutionary Biology Harvard University 22 Divinity Ave. Cambridge Massachusetts 02138 U.S.A.
6. Royal Botanic Gardens Victoria Birdwood Avenue Melbourne VIC 3004 Australia