While photographing for this collection, I had the help of numerous experts for the PA and NJ flora, who gave me detailed tips how to find plants and joined me for excursions.
Special thanks go to Harry Henderson (State College) and Prof. Larry Klotz (Shippensburg). Without their generous and long-time help this database could not have been as complete as it is today. Harry Henderson could also use data he got over many years from the – too early - deceased George Beatty, probably one of the leading experts for the state flora. Both Harry Henderson and Larry Klotz helped with the determination of a great many difficult specimens, especially numerous sheets of Carex.
Much help came also from:
Norm Deno (State College) and the amazing and beautiful wildflower collection in his garden
Tim Draudte
Frank Fee ( State College )
William “Rocky” Gleason (Middletown)
Bob Gruver (State College)
Steve Johnson (Sunbury)
Roger Latham (Rose Valley)
Daniel Laughlin (Flagstaff)
Clark Shiffer (State College)
Prof. Kim Steiner, Kathleen Reeder and Tim Phelps (Arboretum of Penn State University)
Eugene Zielinski (Augusta)
For picture contributions we are grateful to:
Aaron Carlson (Menomonie, WI) (www.flickr.com/people/59003943@N00/)
Alan Cressler (www.flickr.com/photos/alan_cressler/)
Alexander Mrkvicka (Wien)
Allen Crawford (www.flickr.com/photos/34822101@N08/)
Andreas Kleinsteuber (Karlsruhe)
Bernd Haisch (†) (Stutensee)
Brad Wilson (Atlanta, GA) (www.flickr.com/photos/frogdr/)
Carl Luer (Sarasota, FL)
Carol Lund (Clemson)
Corey Raimond (Wisconsin) (www.flickr.com/photos/28511931@N07/)
Dan Mullen (Wisconsin) (www.flickr.com/photos/8583446@N05/)
Dieter Hassler (Kraichtal)
Eric Hunt (Little Rock) (www.flickr.com/photos/ericinsf/)
Ernst Horak (Wien)
Eugene Zielinski (Augusta)
Exner (Botanik im Bild, Wien)
Gerd-Uwe Kresken (Schleswig-Holstein)
Günther Blaich (Mannheim)
Hans Schön (Botanik im Bild, Wien)
Harald Geier
Harry Henderson (State College, PA)
Harry Rose (Australia) (www.flickr.com/photos/73840284@N04/)
J. C. Schou (www.biopix.dk)
Jeffrey Pippen (www.duke.edu/~jspippen/nature.htm)
Jenny Dressler (Costa Rica)
Joachim Rheinheimer (Ludwigshafen)
Joaquín Ramírez López (www.naturalezadeandalucia.blogspot.com)
John Hagstrom (OH) (www.flickr.com/photos/37738527@N06/)
Julia Kruse (Bayreuth)
Jürgen Alberti (Bad Schönborn)
Karlheinz Knoch (Bruchsal-Büchenau)
Keir Morse (California) (www.keiriosity.com)
Kerry Wixted (Annapolis, MD) (http://www.flickr.com/photos/kwixted0/)
Layla Dishman (Texas) (www.flickr.com/photos/layladishman/)
Martin Schulze-Dieckhoff
Martin Sommerfeld (Karlsruhe)
Matt Lavin (Montana State University) (www.flickr.com/photos/plant_diversity/)
Melanie Schori (Athens, OH) (www.flickr.com/photos/7791651@N07/)
Mike Turner (www.flickr.com/photos/61962421@N05/)
Peter Woods (Erie, PA) (www.flickr.com/photos/peteandnoewoods/) (Images courtesy of Western Pennsylvania Conservancy)
Sonnia Hill (Texas) (www.flickr.com/photos/carthamus/)
Steve Johnson (PA)
Svein Erik Larsen (Spain) (www.flickr.com/people/sveineriklarsen/)
Thomas Brune
Thomas Meyer (Günzburg)
Tyler W. Smith (Ottawa) (www.flickr.com/photos/carex/)
Ulrich Lorimer (New York) (www.flickr.com/photos/53817483@N00/)
Volker Kummer (Leipzig)
and others (see credits under the various pictures).