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Fig. 1. Stiff Stalk Lines with expired Plant Variety Protection. 
Public inbreds are noted by standard station release prefix. The PVPA lines with expired protection are shown in shaded boxes. Proprietary lines are from Asgrow Seed, DEKALB Genetics (DK), FFR Cooperative, Illinois Foundation Seeds (FR), Edward J. Funk & Son, Holden's Foundation Seeds (LH), Pfister Hybrid Seed, Claeys Semences, Novartis Seeds (NK), DowElanco, and Pioneer Hi-Bred International (PH). Arrow originates at parent and points to progeny. Pedigree derivation for each line is determined from Plant Variety Protection Act (PVPA) certificates referenced in Table 1, except where noted. 
Smith et al., 1997; 
PVPA certificate number 8800152; ¶PVPA certificate number 9500208; #Gerdes et al., 1993; PVPA certificate number 8700214; PVPA certificate number 9500211; PVPA certificate number 8700036; ¶¶PVPA certificate number 8700173.
