Death year: in Gard. Monthly & Hort. Advertiser 22: 253. 1880 ('M. Nuytens Verschaffelt died on the 30th ult., after a short but painful illness in the fortyfourth year of his age [in 1880]'), https://books.google.ch/books?pg=RA1-PA253&dq=Verschaffelt,+Jean++1880+nuytens+decede&id=4aodAQAAIAAJ&hl=de#v=onepage&q=Verschaffelt%2C%20Jean%20%201880%20nuytens%20decede&f=false (via Boris Heuer)
Example of Name Published
Agave attenuata var. dentata J.E.Verschaff., Cat. Pl. Etabl. Hort. J. N. Verschaffelt 19: 83. 1876