This article offers the first study of a contaminated version of the Byzantine alphabetical anthology known as the Florilegium Coislinianum (9th-10th c.). The paper presents a stemma codicum for the four known witnesses of that version of the anthology (namely, Athen. EBE, Met., S. Sep. 243, Oxon. Bodl. Bar. 91, Ath. Dion. 274, and Oxon. Aed. Chr. 47). It also probes into the way the contamination was carried out and reconstructs the format and layout of the lost exemplar of this peculiar version of the Florilegium Coislinianum.