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In 83 species of the families Monotropaceae, Apocynaceae, Oleaceae, Scrophulariaceae, Lentibulariaceae, Bignoniaceae, Martyniaceae, Myoporaceae, Verbenaceae, Lamiaceae, Campanulaceae, and Liliaceae, protein bodies in the cell nuclei have been found, in 68 of these species for the first time. On the basis of their structure in accordance with morphological characters the genera Burgsdorfia, Hesiodia, Olisia, and Phlomoides of the Lamiaceae are accepted; Lamium is divided into Lamium, Lamiastrum and Orvala; two new combinations are established: Kickxia campyloceras ( Rech. fil. & Esfandiari) Speta and Etornotus papilionaceus ( Burm. in L.) Speta. Deviating shape or lack of protein bodies corroborate former taxonomic decisions, e.g. the transfer of Monotropa to Monotropaceae or the separation of Galeopsis and Ladanum; Veronica schmidtiana should not be included in Pseudolysimachion. Systematic affinities are discussed primarily within Scrophulariaceae because nuclear protein bodies have been studied already in many species of this family. For Campanula patula two 2 x populations are reported. [ABSTRACT FROM AUTHOR]