We wish to thank the curators of the following herbaria for their assistance with loans and in some cases their hospitality during G. Kline’s visits: A, APCR, ARIZ, AUA, BM, BREM, BUPL, CAN, CAS, CM, CHS, CHSC, DUKE, EIU, ENCB, F, FSU, G-DC, GA, GH, HAL, HNH, ILL, ILLS, ISM, K, KANU, LAF, LSU, LSUS, MAINE, MEXU, MICH, MIN, MISS, MO, MOR, MT, NCU, ND, NEBC, NLU, NO, NY, NYS, OCLA, OS, P-MICH, PH, PR, PRC, RSA, SBBG, SD, SDSU, SIU, SMU, TEX, TRT, UBC, UC, UCR, UMO, UNA, US, USCH, VDB, VT, W, WARK, WMI, WIS, and Z. Curators at B, BR, C, CGG, GOET, JE, KIEL, and L kindly searched for original material for us. We particularly thank curators at G, P, PH, PR, PRC, and W for sending us digital photographs of type specimens. C. Aupic at P, P. Triskova at PRC, and A. Farjon at K kindly provided additional information on type specimens or type sheets. E. Wood at Harvard University Herbaria has generously assisted with information and a type photocopy. S. Cafferty and C. Jarvis at BM confirmed Solander’s handwriting on the lectotype of Agrimonia parviflora and assisted in confirming the collection as original material. John Wiersma provided needed advice on a nomenclatural issue. We thank T. Gaither, L. Gawin, K. Gregg, N. Naruhashi, S. Leonard, L. Magrath, J. Pringle, S. Rumyantsev, C. Sweeney, and W. Weber for the seeds and plants sent to us. G. Kline has been generously assisted in the field by C. Hansen, S. Leonard, and C. Morton. We thank M. A. Previtali and J. Bacon for the Spanish abstract translation. We appreciate the excellent production of the illustrations by Barbara Ball. Lawrence Kelly, James Macklin, and another reviewer greatly improved this paper with their suggestions and criticisms.